imapd.conf

IMAPD.CONF(5)                      Cyrus IMAP                      IMAPD.CONF(5)



NAME
       imapd.conf - Cyrus IMAP documentation

       IMAP configuration file

DESCRIPTION
          /etc/imapd.conf is the configuration file for the Cyrus IMAP server.
          It defines local parameters for IMAP.

          Each line of the /etc/imapd.conf file has the form
                 option: value

          where option is the name of the configuration option being set and
          value is the value that the configuration option is being set to.

          Although there is no limit to the length of a line, a ``\''
          (backslash) character may be used as the last character on a line to
          force it to continue on the next one.  No additional whitespace is
          inserted before or after the ``\''.  Note that a line that is split
          using ``\'' character(s) is still considered a single line.

          For example
                 option:\
                     value1 value2 \
                        value3

          is equivalent to
                 option: value1 value2   value3

          Blank lines and lines beginning with ``#'' are ignored.

          For boolean and enumerated options, the values ``yes'', ``on'', ``t'',
          ``true'' and ``1'' turn the option on, the values ``no'', ``off'',
          ``f'', ``false'' and ``0'' turn the option off.

          Duration options take the form of a number followed by a unit, for
          example 32m (32 minutes).  Units are d (days), h (hours), m (minutes)
          and s (seconds).  Multiple units can be combined and will be summed
          together, for example 1h30m is equivalent to 90m.  If no unit is
          specified, an option-specific backward-compatible default unit is
          assumed (documented on an option-by-option basis).  These are simple
          time units: 1d=24h, 1h=60m, 1m=60s (daylight savings, timezones, leap
          adjustments, etc are not considered).

FIELD DESCRIPTIONS
          The sections below detail options that can be placed in the
          /etc/imapd.conf file, and show each option's default value.  Some
          options have no default value, these are listed with ``<no default>''.
          Some options default to the empty string, these are listed with
          ``<none>''.

          addressbookprefix: #addressbooks
              The prefix for the addressbook mailboxes hierarchies.  The
              hierarchy delimiter will be automatically appended.  The public
              addressbook hierarchy will be at the toplevel of the shared
              namespace.  A user's personal addressbook hierarchy will be a
              child of their Inbox.

          admins: <empty string>
              The list of userids with administrative rights.  Separate each
              userid with a space.  Sites using Kerberos authentication may use
              separate "admin" instances.

              Note that accounts used by users should not be administrators.
              Administrative accounts should not receive mail.  That is, if user
              "jbRo" is a user reading mail, he should not also be in the admins
              line.  Some problems may occur otherwise, most notably the ability
              of administrators to create top-level mailboxes visible to users,
              but not writable by users.

          afspts_localrealms: <none>
              The list of realms which are to be treated as local, and thus
              stripped during identifier canonicalization (for the AFSPTS
              ptloader module).  This is different from loginrealms in that it
              occurs later in the authorization process (as the user id is
              canonified for PTS lookup)

          afspts_mycell: <none>
              Cell to use for AFS PTS lookups.  Defaults to the local cell.

          allowallsubscribe: 0
              Allow subscription to nonexistent mailboxes.  This option is
              typically used on backend servers in a Murder so that users can
              subscribe to mailboxes that don't reside on their "home" server.
              This option can also be used as a workaround for IMAP clients
              which don't play well with nonexistent or unselectable mailboxes
              (e.g., Microsoft Outlook).

          allowanonymouslogin: 0
              Permit logins by the user "anonymous" using any password.  Also
              allows use of the SASL ANONYMOUS mechanism.

          allowapop: 1
              Allow use of the POP3 APOP authentication command.

              Note that this command requires that SASL is compiled with APOP
              support, that the plaintext passwords are available in a SASL
              auxprop backend (e.g., sasldb), and that the system can provide
              enough entropy (e.g., from /dev/urandom) to create a challenge in
              the banner.

          allowdeleted: 0
              Allow access to deleted and expunged data via vendor.cmu-* access

          allownewnews: 0
              Allow use of the NNTP NEWNEWS command.

              Note that this is a very expensive command and should only be
              enabled when absolutely necessary.

          allowplaintext: 0
              If enabled, allows the use of cleartext passwords on the wire.

              By default, the use of cleartext passwords requires a TLS/SSL
              encryption layer to be negotiated prior to any cleartext
              authentication mechanisms being advertised or allowed.  To require
              a TLS/SSL encryption layer to be negotiated prior to ANY
              authentication, see the tls_required option.

          allowsetacl: 1
              Defaults to enabled.  If disabled, disallows the use of the SETACL
              command at all via IMAP.

          allowusermoves: 0
              Allow moving user accounts (with associated meta-data) via RENAME
              or XFER.

              Note that measures should be taken to make sure that the user
              being moved is not logged in, and cannot login during the move.
              Failure to do so may result in the user's meta-data (seen state,
              subscriptions, etc) being corrupted or out of date.

          altnamespace: 1
              Use the alternate IMAP namespace, where personal folders reside at
              the same level in the hierarchy as INBOX.

              This option ONLY applies where interaction takes place with the
              client/user.  Currently this is limited to the IMAP protocol
              (imapd) and Sieve scripts (lmtpd).  This option does NOT apply to
              admin tools such as cyradm (admins ONLY), reconstruct, quota,
              etc., NOR does it affect LMTP delivery of messages directly to
              mailboxes via plus-addressing.  The default changed in 3.0 from
              off to on.

          altprefix: Alt Folders
              Alternative INBOX spellings that can't be accessed in altnamespace
              otherwise go under here

          annotation_db: twoskip
              The cyrusdb backend to use for mailbox annotations.

              Allowed values: skiplist, twoskip, zeroskip

          annotation_db_path: <none>
              The absolute path to the annotations db file.  If not specified,
              will be configdirectory/annotations.db

          anyoneuseracl: 1
              Should non-admin users be allowed to set ACLs for the 'anyone'
              user on their mailboxes?  In a large organization this can cause
              support problems, but it's enabled by default.

          annotation_allow_undefined: 0
              Allow clients to store values for entries which are not defined
              either by Cyrus or in the annotations_definitions file.

          annotation_definitions: <none>
              File containing external (third-party) annotation definitions.

              Each line of the file specifies the properties of an annotation
              and has the following form:
                 name, scope, attrib-type, proxy-type, attrib-names, acl

              name   is the hierarchical name as in RFC 5257 or RFC 5464 (in the
                     latter case, without the leading /shared or /private).  For
                     example, /vendor/acme/blurdybloop.

              scope  specifies whether the annotation is for the server, a
                     mailbox, or a message.

              attrib-type
                        specifies the attribute data type, which is used only to
                        check the string value passed by clients when setting
                        annotations.  The attrib-type is one of:

                     string any value is accepted.

                     content-type
                            this obsolete data type, which was useful for early
                            drafts of the standard, is accepted but silently
                            translated to string.

                     boolean
                            only the strings "true" or "false" are accepted.
                            Checking is case-insensitive but the value is forced
                            to lowercase.

                     int    integers are accepted.

                     uint   non-negative integers are accepted.

              proxy-type
                     specifies whether this attribute is for the backend or
                     proxy servers or both (proxy_and_backend)

              attrib-names
                     is the space-separated list of available attributes for the
                     annotation. Possible attribute names are value.shared,
                     value.priv, and value (which permits both value.priv and
                     value.shared).  The attribute names size, size.shared, and
                     size.priv are accepted but ignored; these attributes are
                     automatically provided by the server if the corresponding
                     value attribute is specified.  Some obsolete attributes,
                     which were defined early drafts of the standard, are
                     accepted and ignored with a warning.

              extra-permissions
                     is the extra ACL permission bits required for setting this
                     annotation, in standard IMAP ACL permission bit string
                     format.  Note that this is in addition to the permission
                     bits specified in RFC 5257 and RFC 5464, so leaving this
                     field empty is harmless.  Note also that there is no way to
                     specify that an annotation can only be set by an admin
                     user; in particular the a permission bit does not achieve
                     this.

                     Blank lines and lines beginning with ``#'' are ignored.

          annotation_callout: <none>
              The pathname of a callout to be used to automatically add
              annotations or flags to a message when it is appended to a
              mailbox.  The path can be either an executable (including a
              script), or a UNIX domain socket.

          annotation_callout_disable_append: 0
              Disables annotations on append with xrunannotator

          annotation_enable_legacy_commands: 0
              Whether to enable the legacy GETANNOTATION/SETANNOTATION commands.
              These commands are deprecated and will be removed in the future,
              but might be useful in the meantime for supporting old clients
              that do not implement the RFC 5464 IMAP METADATA extension.

          aps_topic: <none>
              Topic for Apple Push Service registration.

          aps_topic_caldav: <none>
              Topic for Apple Push Service registration for CalDAV.

          aps_topic_carddav: <none>
              Topic for Apple Push Service registration for CardDAV.

          archive_enabled: 0
              Is archiving enabled for this server.  You also need to have an
              archivepartition for the mailbox.  Archiving allows older email to
              be stored on slower, cheaper disks - even within the same mailbox,
              as distinct from partitions.

          archive_days: <none>
              Deprecated in favour of archive_after.

          archive_after: 7d
              The duration after which to move messages to the archive partition
              if archiving is enabled.

              For backward compatibility, if no unit is specified, days is
              assumed.

          archive_maxsize: 1024
              The size in kilobytes of the largest message that won't be
              archived immediately.  Default is 1Mb

          archive_keepflagged: 0
              If set, messages with the \Flagged system flag won't be archived,
              provided they are smaller than archive_maxsize.

          archivepartition-name: <none>
              The pathname of the archive partition name, corresponding to spool
              partition partition-name.  For any mailbox residing in a directory
              on partition-name, the archived messages will be stored in a
              corresponding directory on archivepartition-name.  Note that not
              every partition-name option is strictly required to have a
              corresponding archivepartition-name option, but that without one
              there's no benefit to enabling archiving.

          auditlog: 0
              Should cyrus output log entries for every action taken on a
              message file or mailboxes list entry?  It's noisy so disabled by
              default, but can be very useful for tracking down what happened if
              things look strange

          auth_mech: unix
              The authorization mechanism to use.

              Allowed values: unix, pts, krb, krb5

          autocreateinboxfolders: <none>
              Deprecated in favor of autocreate_inbox_folders.

          autocreatequota: 0
              Deprecated in favor of autocreate_quota.

          autocreatequotamsg: -1
              Deprecated in favor of autocreate_quota_messages.

          autosievefolders: <none>
              Deprecated in favor of autocreate_sieve_folders.

          generate_compiled_sieve_script: 0
              Deprecated in favor of autocreate_sieve_script_compile.

          autocreate_sieve_compiled_script: <none>
              Deprecated in favor of autocreate_sieve_script_compiled.

          autosubscribeinboxfolders: <none>
              Deprecated in favor of autocreate_subscribe_folders.

          autosubscribesharedfolders: <none>
              Deprecated in favor of autocreate_subscribe_sharedfolders.

          autosubscribe_all_sharedfolders: 0
              Deprecated in favor of autocreate_subscribe_sharedfolders_all.

          autocreate_acl: <none>
              If folders are to be created by autocreate_inbox_folders, this
              setting can be used to apply additional ACLs to the autocreated
              folders.  The syntax is "autocreate_acl folder identifier rights",
              where folder must match one of the autocreate_inbox_folders
              folders, identifier must be a valid cyrus identifier, and rights
              must be a valid cyrus rights string.  Multiple identifier|rights
              pairs can be assigned to a single folder by providing this setting
              multiple times.

              For example, "autocreate_acl Plus anyone p" would allow lmtp
              delivery to a folder named "Plus".

          autocreate_inbox_folders: <none>
              If a user does not have an INBOX already, and the INBOX is to be
              created, create the list of folders in this setting as well.
              autocreate_inbox_folders is a list of INBOX's subfolders separated
              by a "|", that are automatically created by the server under the
              following two scenarios. Leading and trailing whitespace is
              stripped, so "Junk | Trash" results in two folders: "Junk" and
              "Trash".  See also the xlist-flag option, for setting special-use
              flags on autocreated folders.

              INBOX folders are created under both the following conditions:

              1. The user logins via the IMAP or the POP3 protocol.
                 autocreate_quota option must have a value of zero or greater.

              2. A message arrives for the user through the lmtpd(8).
                 autocreate_post option must be enabled.

          autocreate_post: 0
              If enabled, when lmtpd(8) receives an incoming mail for an INBOX
              that does not exist, then the INBOX is automatically created by
              lmtpd(8) and delivery of the message continues.

          autocreate_quota: -1
              If set to a value of zero or higher, users have their INBOX
              folders created upon a successful login event or upon lmtpd(8)
              message delivery if autocreate_post is enabled, provided their
              INBOX did not yet already exist.

              The user's quota is set to the value if it is greater than zero,
              otherwise the user has unlimited quota.

              Note that quota is specified in kilobytes.

          autocreate_quota_messages: -1
              If set to a value of zero or higher, users who have their INBOX
              folders created upon a successful login event (see
              autocreate_quota), or upon lmtpd(8) message delivery if
              autocreate_post is enabled, receive the message quota configured
              in this option.

              The default of -1 disables assigning message quota.

              For consistency with autocreate_quota, a value of zero is treated
              as unlimited message quota, rather than a message quota of zero.

          autocreate_sieve_folders: <none>
              A "|" separated list of subfolders of INBOX that will be
              automatically created, if requested by a sieve filter, through the
              "fileinto" action. The default is to create no folders
              automatically.

              Leading and trailing whitespace is stripped from each folder, so a
              setting of "Junk | Trash" will create two folders: "Junk" and
              "Trash".

          autocreate_sieve_script: <none>
              The full path of a file that contains a sieve script. This script
              automatically becomes a user's initial default sieve filter
              script.

              When this option is not defined, no default sieve filter is
              created.  The file must be readable by the Cyrus daemon.

          autocreate_sieve_script_compile: 0
              If set to yes and no compiled sieve script file exists, the sieve
              script which is compiled on the fly will be saved in the file name
              that autocreate_sieve_compiledscript option points to. In order a
              compiled script to be generated, autocreate_sieve_script and
              autocreate_sieve_compiledscript must have valid values

          autocreate_sieve_script_compiled: <none>
              The full path of a file that contains a compiled in bytecode sieve
              script. This script automatically becomes a user's initial default
              sieve filter script.  If this option is not specified, or the
              filename doesn't exist then the script defined by
              autocreate_sieve_script is compiled on the fly and installed as
              the user's default sieve script

          autocreate_subscribe_folders: <none>
              A list of folder names, separated by "|", that the users get
              automatically subscribed to, when their INBOX is created. These
              folder names must have been included in the autocreateinboxfolders
              option of the imapd.conf.

          autocreate_subscribe_sharedfolders: <none>
              A list of shared folders (bulletin boards), separated by "|", that
              the users get automatically subscribed to, after their INBOX is
              created. The shared folder must have been created and the user
              must have the required permissions to get subscribed to it.
              Otherwise, subscribing to the shared folder fails.

          autocreate_subscribe_sharedfolders_all: 0
              If set to yes, the user is automatically subscribed to all shared
              folders, one has permission to subscribe to.

          autocreate_users: anyone
              A space separated list of users and/or groups that are allowed
              their INBOX to be automatically created.

          autoexpunge: 0
              If set to yes, then all Deleted messages will be automatically
              expunged whenever an index is closed, whether CLOSE, UNSELECT,
              SELECT or on disconnect

          backuppartition-name: <none>
              The pathname of the backup partition name.  At least one backup
              partition pathname MUST be specified if backups are in use.  Note
              that there is no relationship between spool partitions and backup
              partitions.

          backup_compact_minsize: 0
              The minimum size in kilobytes of chunks in each backup.  The
              compact tool will try to combine adjacent chunks that are smaller
              than this.

              Setting this value to zero or negative disables combining of
              chunks.

          backup_compact_maxsize: 0
              The maximum size in kilobytes of chunks in each backup.  The
              compact tool will try to split chunks larger than this into
              smaller chunks.

              Setting this value to zero or negative disables splitting of
              chunks.

          backup_compact_work_threshold: 1
              The number of chunks that must obviously need compaction before
              the compact tool will go ahead with the compaction.  If set to
              less than one, the value is treated as being one.

          backup_staging_path: <none>
              The absolute path of the backup staging area.  If not specified,
              will be temp_path/backup

          backup_retention_days: <none>
              Deprecated in favor of backup_retention.

          backup_retention: 7d
              How long to keep content in backup after it has been deleted from
              the source.  If set to a negative value or zero, deleted content
              will be kept indefinitely.

              For backward compatibility, if no unit is specified, days is
              assumed.

          backup_db: twoskip
              The cyrusdb backend to use for the backup locations database.

              Allowed values: skiplist, sql, twoskip, zeroskip

          backup_db_path: <none>
              The absolute path to the backup db file.  If not specified, will
              be configdirectory/backups.db

          backup_keep_previous: 0
              Whether the ctl_backups compact and ctl_backups reindex commands
              should preserve the original file.  The original file will be
              named with a timestamped suffix.  This is mostly useful for
              debugging.

              Note that with this enabled, compacting a backup will actually
              increase the disk used by it (because there will now be an extra
              copy: the original version, and the compacted version).

          boundary_limit: 1000
              messages are parsed recursively and a deep enough MIME structure
              can cause a stack overflow.  Do not parse deeper than this many
              layers of MIME structure.  The default of 1000 is much higher than
              any sane message should have.

          caldav_allowattach: 1
              Enable managed attachments support on the CalDAV server.

          caldav_allowcalendaradmin: 0
              Enable per-user calendar administration web UI on the CalDAV
              server.

          caldav_allowscheduling: on
              Enable calendar scheduling operations. If set to "apple", the
              server will emulate Apple CalendarServer behavior as closely as
              possible.  Allowed values: off, on, apple

          caldav_create_attach: 1
              Create the 'Attachments' collection if it doesn't already exist

          caldav_create_default: 1
              Create the 'Default' calendar if it doesn't already exist

          caldav_create_sched: 1
              Create the 'Inbox' and 'Outbox' calendars if they don't already
              exist

          caldav_historical_age: 7d
              How long after an occurrence of event or task has concluded that
              it is considered 'historical'.  Changes to historical occurrences
              of events or tasks WILL NOT have invite or reply messages sent for
              them.  A negative value means that events and tasks are NEVER
              considered historical.

              For backward compatibility, if no unit is specified, days is
              assumed.

          caldav_maxdatetime: 20380119T031407Z
              The latest date and time accepted by the server (ISO format).
              This value is also used for expanding non-terminating recurrence
              rules.

              Note that increasing this value will require the DAV databases for
              calendars to be reconstructed with the dav_reconstruct utility in
              order to see its effect on serer-side time-based queries.

          caldav_mindatetime: 19011213T204552Z
              The earliest date and time accepted by the server (ISO format).

          caldav_realm: <none>
              The realm to present for HTTP authentication of CalDAV resources.
              If not set (the default), the value of the "servername" option
              will be used.

          calendarprefix: #calendars
              The prefix for the calendar mailboxes hierarchies.  The hierarchy
              delimiter will be automatically appended.  The public calendar
              hierarchy will be at the toplevel of the shared namespace.  A
              user's personal calendar hierarchy will be a child of their Inbox.

          calendar_user_address_set: <none>
              Space-separated list of domains corresponding to calendar user
              addresses for which the server is responsible.  If not set (the
              default), the value of the "servername" option will be used.

          calendar_component_set: VEVENT VTODO VJOURNAL VFREEBUSY VAVAILABILITY
          VPOLL
              Space-separated list of iCalendar component types that calendar
              object resources may contain in a calendar collection.  This
              restriction is only set at calendar creation time and only if the
              CalDAV client hasn't specified a restriction in the creation
              request.  Allowed values: VEVENT, VTODO, VJOURNAL, VFREEBUSY,
              VAVAILABILITY, VPOLL

          carddav_allowaddmember: 0
              Enable support for POST add-member on the CardDAV server.

          carddav_allowaddressbookadmin: 0
              Enable per-user addressbook administration web UI on the CardDAV
              server.

          carddav_realm: <none>
              The realm to present for HTTP authentication of CardDAV resources.
              If not set (the default), the value of the "servername" option
              will be used.

          carddav_repair_vcard: 0
              If enabled, VCARDs with invalid content are attempted to be
              repaired during creation.

          chatty: 0
              If yes, syslog tags and commands for every IMAP command, mailboxes
              for every lmtp connection, every POP3 command, etc

          client_bind: 0
              If enabled, a specific IP will be bound when performing a client
              connection.  client_bind_name is used if it is set, otherwise
              servername is used.  This is useful on multi-homed servers where
              Cyrus should not use other services' interfaces.

              If not enabled (the default), no bind will be performed.  Client
              connections will use an IP chosen by the operating system.

          client_bind_name: <none>
              IPv4, IPv6 address or hostname to bind for client connections when
              client_bind is enabled.  If not set (the default), servername will
              be used.

          client_timeout: 10s
              Time to wait before returning a timeout failure when performing a
              client connection (e.g. in a murder environment).

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          commandmintimer: <none>
              Time in seconds. Any imap command that takes longer than this time
              is logged.

          configdirectory: <none>
              The pathname of the IMAP configuration directory.  This field is
              required.

          createonpost: 0
              Deprecated in favor of autocreate_post.

          conversations: 0
              Enable the XCONVERSATIONS extensions.  Extract conversation
              tracking information from incoming messages and track them in
              per-user databases.

          conversations_counted_flags: <none>
              space-separated list of flags for which per-conversation counts
              will be kept.  Note that you need to reconstruct the conversations
              database with ctl_conversationsdb if you change this option on a
              running server, or the counts will be wrong.

          conversations_db: skiplist
              The cyrusdb backend to use for the per-user conversations
              database.

              Allowed values: skiplist, sql, twoskip, zeroskip

          conversations_expire_days: <none>
              Deprecated in favor of conversations_expire_after.

          conversations_expire_after: 90d
              How long the conversations database keeps the message tracking
              information needed for receiving new messages in existing
              conversations.

              For backward compatibility, if no unit is specified, days is
              assumed.

          conversations_max_thread: 100
              maximum size for a single thread.  Threads will split if they have
              this many * messages in them and another message arrives

          crossdomains: 0
              Enable cross domain sharing.  This works best with alt namespace
              and unix hierarchy separators on, so you get Other
              Users/foo@example.com/...

          crossdomains_onlyother: 0
              only show the domain for users in other domains than your own (for
              backwards compatibility if you're already sharing

          cyrus_group: <none>
              The name of the group Cyrus services will run as.  If not
              configured, the primary group of cyrus_user will be used. Can be
              further overridden by setting the $CYRUS_GROUP environment
              variable.

          cyrus_user: <none>
              The username to use as the 'cyrus' user.  If not configured, the
              compile time default will be used. Can be further overridden by
              setting the $CYRUS_USER environment variable.

          davdriveprefix: #drive
              The prefix for the DAV storage mailboxes hierarchies.  The
              hierarchy delimiter will be automatically appended.  The public
              storage hierarchy will be at the toplevel of the shared namespace.
              A user's personal storage hierarchy will be a child of their
              Inbox.

          davnotificationsprefix: #notifications
              The prefix for the DAV notifications hierarchy.  The hierarchy
              delimiter will be automatically appended.  The public
              notifications hierarchy will be at the toplevel of the shared
              namespace.  A user's personal notifications hierarchy will be a
              child of their Inbox.

          dav_realm: <none>
              The realm to present for HTTP authentication of generic DAV
              resources (principals).  If not set (the default), the value of
              the "servername" option will be used.

          dav_lock_timeout: 20s
              The maximum time to wait for a write lock on the per-user DAV
              database before timeout. For HTTP requests, the HTTP status code
              503 is returned if the lock can not be obtained within this time.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          debug_command: <none>
              Debug command to be used by processes started with -D option.  The
              string is a C format string that gets 3 options: the first is the
              name of the executable (as specified in the cmd parameter in
              cyrus.conf). The second is the pid (integer) and the third is the
              service ID.  Example: /usr/local/bin/gdb /usr/cyrus/bin/%s %d

          defaultacl: anyone lrs
              The Access Control List (ACL) placed on a newly-created (non-user)
              mailbox that does not have a parent mailbox.

          defaultdomain: internal
              The default domain for virtual domain support

          defaultpartition: <none>
              The partition name used by default for new mailboxes.  If not
              specified, the partition with the most free space will be used for
              new mailboxes.

              Note that the partition specified by this option must also be
              specified as partition-name, where you substitute 'name' for the
              alphanumeric string you set defaultpartition to.

          defaultsearchtier: <empty string>
              Name of the default tier that messages will be indexed to. Search
              indexes can be organized in tiers to allow index storage in
              different directories and physical media. See the man page of
              squatter for details. The default search tier also requires the
              definition of an according searchtierpartition-name entry.

              This option MUST be specified for xapian search.

          defaultserver: <none>
              The backend server name used by default for new mailboxes.  If not
              specified, the server with the most free space will be used for
              new mailboxes.

          deletedprefix: DELETED
              With delete_mode set to delayed, the deletedprefix setting defines
              the prefix for the hierarchy of deleted mailboxes.

              The hierarchy delimiter will be automatically appended.

          delete_mode: delayed
              The manner in which mailboxes are deleted. In the default delayed
              mode, mailboxes that are being deleted are renamed to a special
              mailbox hierarchy under the deletedprefix, to be removed later by
              cyr_expire(8).

              In immediate mode, the mailbox is removed from the filesystem
              immediately.

              Allowed values: immediate, delayed

          delete_unsubscribe: 0
              Whether to also unsubscribe from mailboxes when they are deleted.
              Note that this behaviour contravenes RFC 3501 section 6.3.9, but
              may be useful for avoiding user/client software confusion.  The
              default is 'no'.

          deleteright: c
              Deprecated - only used for backwards compatibility with existing
              installations.  Lists the old RFC 2086 right which was used to
              grant the user the ability to delete a mailbox.  If a user has
              this right, they will automatically be given the new 'x' right.

          disable_user_namespace: 0
              Preclude list command on user namespace.  If set to 'yes', the
              LIST response will never include any other user's mailbox.  Admin
              users will always see all mailboxes.  The default is 'no'

          disable_shared_namespace: 0
              Preclude list command on shared namespace.  If set to 'yes', the
              LIST response will never include any non-user mailboxes.  Admin
              users will always see all mailboxes.  The default is 'no'

          disconnect_on_vanished_mailbox: 0
              If enabled, IMAP/POP3/NNTP clients will be disconnected by the
              server if the currently selected mailbox is (re)moved by another
              session.  Otherwise, the missing mailbox is treated as empty while
              in use by the client.

          ischedule_dkim_domain: <none>
              The domain to be reported as doing iSchedule DKIM signing.

          ischedule_dkim_key_file: <none>
              File containing the private key for iSchedule DKIM signing.

          ischedule_dkim_required: 1
              A DKIM signature is required on received iSchedule requests.

          ischedule_dkim_selector: <none>
              Name of the selector subdividing the domain namespace.  This
              specifies the actual key used for iSchedule DKIM signing within
              the domain.

          duplicate_db: twoskip
              The cyrusdb backend to use for the duplicate delivery suppression
              and sieve.  Allowed values: skiplist, sql, twoskip, zeroskip

          duplicate_db_path: <none>
              The absolute path to the duplicate db file.  If not specified,
              will be configdirectory/deliver.db

          duplicatesuppression: 1
              If enabled, lmtpd will suppress delivery of a message to a mailbox
              if a message with the same message-id (or resent-message-id) is
              recorded as having already been delivered to the mailbox.  Records
              the mailbox and message-id/resent-message-id of all successful
              deliveries.

          event_content_inclusion_mode: standard
              The mode in which message content may be included with
              MessageAppend and MessageNew. "standard" mode is the default
              behavior in which message is included up to a size with the
              notification. In "message" mode, the message is included and may
              be truncated to a size. In "header" mode, it includes headers
              truncated to a size. In "body" mode, it includes body truncated to
              a size. In "headerbody" mode, it includes full headers and body
              truncated to a size Allowed values: standard, message, header,
              body, headerbody

          event_content_size: 0
              Truncate the message content that may be included with
              MessageAppend and MessageNew. Set 0 to include the entire message
              itself

          event_exclude_flags: <none>
              Don't send event notification for given IMAP flag(s)

          event_exclude_specialuse: \Junk
              Don't send event notification for folder with given special-use
              attributes.  Set ALL for any folder

          event_extra_params: timestamp
              Space-separated list of extra parameters to add to any
              appropriated event.

              Allowed values: bodyStructure, clientAddress, diskUsed, flagNames,
              messageContent, messageSize, messages, modseq, service, timestamp,
              uidnext, vnd.cmu.midset, vnd.cmu.unseenMessages, vnd.cmu.envelope,
              vnd.cmu.sessionId, vnd.cmu.mailboxACL, vnd.cmu.mbtype,
              vnd.cmu.davFilename, vnd.cmu.davUid, vnd.fastmail.clientId,
              vnd.fastmail.sessionId, vnd.fastmail.convExists,
              vnd.fastmail.convUnseen, vnd.fastmail.cid, vnd.fastmail.counters,
              vnd.cmu.emailid, vnd.cmu.threadid

          event_groups: message mailbox
              Space-separated list of groups of related events to turn on
              notification

              Allowed values: message, quota, flags, access, mailbox,
              subscription, calendar, applepushservice

          event_notifier: <none>
              Notifyd(8) method to use for "EVENT" notifications which are based
              on the RFC 5423.  If not set, "EVENT" notifications are disabled.

          expunge_mode: delayed
              The mode in which messages (and their corresponding cache entries)
              are expunged.  "semidelayed" mode is the old behavior in which the
              message files are purged at the time of the EXPUNGE, but index and
              cache records are retained to facilitate QRESYNC.  In "delayed"
              mode, which is the default since Cyrus 2.5.0, the message files
              are also retained, allowing unexpunge to rescue them.  In
              "immediate" mode, both the message files and the index records are
              removed as soon as possible.  In all cases, nothing will be
              finally purged until all other processes have closed the mailbox
              to ensure they never see data disappear under them.  In
              "semidelayed" or "delayed" mode, a later run of "cyr_expire" will
              clean out the retained records (and possibly message files).  This
              reduces the amount of I/O that takes place at the time of EXPUNGE
              and should result in greater responsiveness for the client,
              especially when expunging a large number of messages.  Allowed
              values: immediate, semidelayed, delayed

          failedloginpause: 3s
              Time to pause after a failed login.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          flushseenstate: 1
              Deprecated. No longer used

          foolstupidclients: 0
              If enabled, only list the personal namespace when a LIST "*" is
              performed (it changes the request to a LIST "INBOX*").

          force_sasl_client_mech: <none>
              Force preference of a given SASL mechanism for client side
              operations (e.g., murder environments).  This is separate from
              (and overridden by) the ability to use the <host shortname>_mechs
              option to set preferred mechanisms for a specific host

          fulldirhash: 0
              If enabled, uses an improved directory hashing scheme which hashes
              on the entire username instead of using just the first letter as
              the hash.  This changes hash algorithm used for quota and user
              directories and if hashimapspool is enabled, the entire mail
              spool.

              Note that this option CANNOT be changed on a live system.  The
              server must be quiesced and then the directories moved with the
              rehash utility.

          hashimapspool: 0
              If enabled, the partitions will also be hashed, in addition to the
              hashing done on configuration directories.  This is recommended if
              one partition has a very bushy mailbox tree.

          debug: 0
              If enabled, allow syslog() to pass LOG_DEBUG messages.

          hostname_mechs: <none>
              Force a particular list of SASL mechanisms to be used when
              authenticating to the backend server hostname (where hostname is
              the short hostname of the server in question). If it is not
              specified it will query the server for available mechanisms and
              pick one to use. - Cyrus Murder

          hostname_password: <none>
              The password to use for authentication to the backend server
              hostname (where hostname is the short hostname of the server) -
              Cyrus Murder

          httpallowcompress: 1
              If enabled, the server will compress response payloads if the
              client indicates that it can accept them.  Note that the
              compressed data will appear in telemetry logs, leaving only the
              response headers as human-readable.

          httpallowcors: <none>
              A wildmat pattern specifying a list of origin URIs ( scheme "://"
              host [ ":" port ] ) that are allowed to make Cross-Origin Resource
              Sharing (CORS) requests on the server.  By default, CORS requests
              are disabled.

              Note that the scheme and host should both be lowercase, the port
              should be omitted if using the default for the scheme (80 for
              http, 443 for https), and there should be no trailing '/' (e.g.:
              "http://www.example.com:8080", "https://example.org").

          httpallowtrace: 0
              Allow use of the TRACE method.

              Note that sensitive data might be disclosed by the response.

          httpallowedurls: <none>
              Space-separated list of relative URLs (paths) rooted at
              "httpdocroot" (see below) to be served by httpd.  If set, this
              option will limit served static content to only those paths
              specified (returning "404 Not Found" to any other client requested
              URLs).  Otherwise, httpd will serve any content found in
              "httpdocroot".

              Note that any path specified by "rss_feedlist_template" is an
              exception to this rule.

          httpcontentmd5: 0
              If enabled, HTTP responses will include a Content-MD5 header for
              the purpose of providing an end-to-end message integrity check
              (MIC) of the payload body.  Note that enabling this option will
              use additional CPU to generate the MD5 digest, which may be
              ignored by clients anyways.

          httpdocroot: <none>
              If set, http will serve the static content (html/text/jpeg/gif
              files, etc) rooted at this directory.  Otherwise, httpd will not
              serve any static content.

          httpkeepalive: 20s
              Set the length of the HTTP server's keepalive heartbeat.  The
              default is 20 seconds.  The minimum value is 0, which will disable
              the keepalive heartbeat.  When enabled, if a request takes longer
              than httpkeepalive to process, the server will send the client
              provisional responses every httpkeepalive until the final response
              can be sent.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          httpmodules: <empty string>
              Space-separated list of HTTP modules that will be enabled in
              httpd(8).  This option has no effect on modules that are disabled
              at compile time due to missing dependencies (e.g. libical).

              Note that "domainkey" depends on "ischedule" being enabled, and
              that both "freebusy" and "ischedule" depend on "caldav" being
              enabled.  Allowed values: admin, caldav, carddav, cgi, domainkey,
              freebusy, ischedule, jmap, prometheus, rss, tzdist, webdav

          httpprettytelemetry: 0
              If enabled, HTTP response payloads including server-generated
              markup languages (HTML, XML) will utilize line breaks and
              indentation to promote better human-readability in telemetry logs.
              Note that enabling this option will increase the amount of data
              sent across the wire.

          httptimeout: 5m
              Set the length of the HTTP server's inactivity autologout timer.
              The default is 5 minutes.  The minimum value is 0, which will
              disable persistent connections.

              For backwards compatibility, if no unit is specified, minutes is
              assumed.

          idlesocket: {configdirectory}/socket/idle
              Unix domain socket that idled listens on.

          ignorereference: 0
              For backwards compatibility with Cyrus 1.5.10 and earlier --
              ignore the reference argument in LIST or LSUB commands.

          imapidlepoll: 60s
              The interval for polling for mailbox changes and ALERTs while
              running the IDLE command.  This option is used when idled is not
              enabled or cannot be contacted.  The minimum value is 1 second.  A
              value of 0 will disable IDLE.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          imapidresponse: 1
              If enabled, the server responds to an ID command with a parameter
              list containing: version, vendor, support-url, os, os-version,
              command, arguments, environment.  Otherwise the server returns
              NIL.

          imapmagicplus: 0
              Only list a restricted set of mailboxes via IMAP by using
              userid+namespace syntax as the authentication/authorization id.
              Using userid+ (with an empty namespace) will list only subscribed
              mailboxes.

          imipnotifier: <none>
              Notifyd(8) method to use for "IMIP" notifications which are based
              on the RFC 6047.  If not set, "IMIP" notifications are disabled.

          implicit_owner_rights: lkxan
              The implicit Access Control List (ACL) for the owner of a mailbox.

          @include: <none>
              Directive which includes the specified file as part of the
              configuration.  If the path to the file is not absolute,
              CYRUS_PATH is prepended.

          improved_mboxlist_sort: 0
              If enabled, a special comparator will be used which will correctly
              sort mailbox names that contain characters such as ' ' and '-'.

              Note that this option SHOULD NOT be changed on a live system.  The
              mailboxes database should be dumped (ctl_mboxlist) before the
              option is changed, removed, and then undumped after changing the
              option.  When not using flat files for the subscriptions databases
              the same has to be done (cyr_dbtool) for each subscription
              database See improved_mboxlist_sort.html.

          jmap_emailsearch_db_path: <none>
              The absolute path to the JMAP email search cache file.  If not
              specified, JMAP Email/query and Email/queryChanges will not cache
              email search results.

          jmap_preview_annot: <none>
              The name of the per-message annotation, if any, to store message
              previews.

          jmap_imagesize_annot: <none>
              The name of the per-message annotation, if any, that stores a JSON
              object, mapping message part numbers of MIME image types to an
              array of their image dimensions. The array must have at least two
              entries, where the first entry denotes the width and the second
              entry the height of the image. Any additional values are ignored.

              For example, if message part 1.2 contains an image of width 300
              and height 200, then the value of this annotation would be:

              { "1.2" : [ 300, 200 ] }

          jmap_inlinedcids_annot: <none>
              The name of the per-message annotation, if any, that stores a JSON
              object, mapping RFC 2392 Content-IDs referenced in HTML bodies to
              the respective HTML body part number.

              For example, if message part 1.2 contains HTML and references an
              inlined image at "cid:foo", then the value of this annotation
              would be:

              { "<foo>" : "1.2" }

              Note that the Content-ID key must be URL-unescaped and enclosed in
              angular brackets, as defined in RFC 2392.

          jmap_preview_length: 64
              The maximum byte length of dynamically generated message previews.
              Previews stored in jmap_preview_annot take precedence.

          jmap_max_size_upload: 1048576
              The maximum size (in kilobytes) that the JMAP API accepts for blob
              uploads. Returned as the maxSizeUpload property value of the JMAP
              "urn:ietf:params:jmap:core" capabilities object.  Default is 1Gb.

          jmap_max_concurrent_upload: 5
              The value to return for the maxConcurrentUpload property of the
              JMAP "urn:ietf:params:jmap:core" capabilities object. The Cyrus
              JMAP implementation does not enforce this rate-limit.

          jmap_max_size_request: 10240
              The maximum size (in kilobytes) that the JMAP API accepts for
              requests at the API endpoint. Returned as the maxSizeRequest
              property value of the JMAP "urn:ietf:params:jmap:core"
              capabilities object. Default is 10Mb.

          jmap_max_concurrent_requests: 5
              The value to return for the maxConcurrentRequests property of the
              JMAP "urn:ietf:params:jmap:core" capabilities object. The Cyrus
              JMAP implementation does not enforce this rate-limit.

          jmap_max_calls_in_request: 50
              The maximum number of calls per JMAP request object.  Returned as
              the maxCallsInRequest property value of the JMAP "‐
              urn:ietf:params:jmap:core" capabilities object.

          jmap_max_delayed_send: 512d
              The value to return for the maxDelayedSend property of the JMAP "‐
              urn:ietf:params:jmap:emailsubmission" capabilities object.  The
              Cyrus JMAP implementation does not enforce this limit.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          jmap_max_objects_in_get: 4096
              The maximum number of ids that a JMAP client may request in a
              single "/get" type method call. The actual number of returned
              objects in the response may exceed this number if the JMAP object
              type supports unbounded "/get" calls.  Returned as the
              maxObjectsInGet property value of the JMAP "‐
              urn:ietf:params:jmap:core" capabilities object.

          jmap_max_objects_in_set: 4096
              The maximum number of objects a JMAP client may send to create,
              update or destroy in a single /set type method call.  Returned as
              the maxObjectsInSet property value of the JMAP "‐
              urn:ietf:params:jmap:core" capabilities object.

          jmap_mail_max_size_attachments_per_email: 10240
              The value (in kilobytes) to return for the
              maxSizeAttachmentsPerEmail property of the JMAP "‐
              urn:ietf:params:jmap:mail" capabilities object. The Cyrus JMAP
              implementation does not enforce this size limit. Default is 10 Mb.

          jmap_nonstandard_extensions: 0
              If enabled, support non-standard JMAP extensions.  If not enabled,
              only IETF standard JMAP functionality is supported.

          jmap_set_has_attachment: 1
              If enabled, the $hasAttachment flag is determined and set for new
              messages created with the JMAP Email/set or Email/import methods.
              This option should typically be enabled, but installations using
              Cyrus-external message annatotors to determine the $hasAttachment
              flag might want to disable it.

          jmap_vacation: 1
              If enabled, support the JMAP vacation extension

          jmapuploadfolder: #jmap
              the name of the folder for JMAP uploads (#jmap)

          jmapsubmission_deleteonsend: 1
              If enabled (the default) then delete the EmailSubmission as soon
              as the email * has been sent

          jmapsubmissionfolder: #jmapsubmission
              the name of the folder for JMAP Submissions (#jmapsubmission)

          jmappushsubscriptionfolder: #jmappushsubscription
              the name of the folder for JMAP Push Subscriptions
              (#jmappushsubscription)

          iolog: 0
              Should cyrus output I/O log entries

          ldap_authz: <none>
              SASL authorization ID for the LDAP server

          ldap_base: <empty string>
              Contains the LDAP base dn for the LDAP ptloader module

          ldap_bind_dn: <none>
              Bind DN for the connection to the LDAP server (simple bind).  Do
              not use for anonymous simple binds

          ldap_deref: never
              Specify how aliases dereferencing is handled during search.

              Allowed values: search, find, always, never

          ldap_domain_base_dn: <empty string>
              Base DN to search for domain name spaces.

          ldap_domain_filter:
          (&(objectclass=domainrelatedobject)(associateddomain=%s))
              Filter to use searching for domains

          ldap_domain_name_attribute: associateddomain
              The attribute name for domains.

          ldap_domain_scope: sub
              Search scope

              Allowed values: sub, one, base

          ldap_domain_result_attribute: inetdomainbasedn
              Result attribute

          ldap_filter: (uid=%u)
              Specify a filter that searches user identifiers.  The following
              tokens can be used in the filter string:

              %%   = % %u   = user %U   = user portion of %u (%U = test when %u
              = test@domain.tld) %d   = domain portion of %u if available (%d =
              domain.tld when %u = test@domain.tld), otherwise same as %R %R   =
              domain portion of %u starting with @ (%R = @domain.tld when %u =
              test@domain.tld) %D   = user dn.  (use when ldap_member_method:
              filter) %1-9 = domain tokens (%1 = tld, %2 = domain when %d =
              domain.tld)

              ldap_filter is not used when ldap_sasl is enabled.

          ldap_group_base: <empty string>
              LDAP base dn for ldap_group_filter.

          ldap_group_filter: (cn=%u)
              Specify a filter that searches for group identifiers.  See
              ldap_filter for more options.

          ldap_group_scope: sub
              Specify search scope for ldap_group_filter.

              Allowed values: sub, one, base

          ldap_id: <none>
              SASL authentication ID for the LDAP server

          ldap_mech: <none>
              SASL mechanism for LDAP authentication

          ldap_user_attribute: <none>
              Specify LDAP attribute to use as canonical user id

          ldap_member_attribute: <none>
              See ldap_member_method.

          ldap_member_base: <empty string>
              LDAP base dn for ldap_member_filter.

          ldap_member_filter: (member=%D)
              Specify a filter for "ldap_member_method: filter".  See
              ldap_filter for more options.

          ldap_member_method: attribute
              Specify a group method.  The "attribute" method retrieves groups
              from a multi-valued attribute specified in ldap_member_attribute.

              The "filter" method uses a filter, specified by
              ldap_member_filter, to find groups; ldap_member_attribute is a
              single-value attribute group name.  Allowed values: attribute,
              filter

          ldap_member_scope: sub
              Specify search scope for ldap_member_filter.

              Allowed values: sub, one, base

          ldap_password: <none>
              Password for the connection to the LDAP server (SASL and simple
              bind).  Do not use for anonymous simple binds

          ldap_realm: <none>
              SASL realm for LDAP authentication

          ldap_referrals: 0
              Specify whether or not the client should follow referrals.

          ldap_restart: 1
              Specify whether or not LDAP I/O operations are automatically
              restarted if they abort prematurely.

          ldap_sasl: 1
              Use SASL for LDAP binds in the LDAP PTS module.

          ldap_sasl_authc: <none>
              Deprecated.  Use ldap_id

          ldap_sasl_authz: <none>
              Deprecated.  Use ldap_authz

          ldap_sasl_mech: <none>
              Deprecated.  Use ldap_mech

          ldap_sasl_password: <none>
              Deprecated.  User ldap_password

          ldap_sasl_realm: <none>
              Deprecated.  Use ldap_realm

          ldap_scope: sub
              Specify search scope.

              Allowed values: sub, one, base

          ldap_servers: ldap://localhost/
              Deprecated.  Use ldap_uri

          ldap_size_limit: 1
              Specify a number of entries for a search request to return.

          ldap_start_tls: 0
              Use transport layer security for ldap:// using STARTTLS. Do not
              use ldaps:// in 'ldap_uri' with this option enabled.

          ldap_time_limit: 5s
              How long to wait for a search request to complete.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          ldap_timeout: 5s
              How long a search can take before timing out.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          ldap_ca_dir: <none>
              Path to a directory with CA (Certificate Authority) certificates.

          ldap_ca_file: <none>
              Path to a file containing CA (Certificate Authority)
              certificate(s).

          ldap_ciphers: <none>
              List of SSL/TLS ciphers to allow.  The format of the string is
              described in ciphers(1).

          ldap_client_cert: <none>
              File containing the client certificate.

          ldap_client_key: <none>
              File containing the private client key.

          ldap_verify_peer: 0
              Require and verify server certificate.  If this option is yes, you
              must specify ldap_ca_file or ldap_ca_dir.

          ldap_tls_cacert_dir: <none>
              Deprecated in favor of ldap_ca_dir.

          ldap_tls_cacert_file: <none>
              Deprecated in favor of ldap_ca_file.

          ldap_tls_cert: <none>
              Deprecated in favor of ldap_client_cert.

          ldap_tls_key: <none>
              Deprecated in favor of ldap_client_key.

          ldap_tls_check_peer: 0
              Deprecated in favor of ldap_verify_peer.

          ldap_tls_ciphers: <none>
              Deprecated in favor of ldap_ciphers.

          ldap_uri: <none>
              Contains a list of the URLs of all the LDAP servers when using the
              LDAP PTS module.

          ldap_version: 3
              Specify the LDAP protocol version.  If ldap_start_tls and/or
              ldap_use_sasl are enabled, ldap_version will be automatically set
              to 3.

          literalminus: 0
              if enabled, CAPABILITIES will reply with LITERAL- rather than
              LITERAL+ (RFC 7888).  Doesn't actually size-restrict uploads
              though

          lmtp_downcase_rcpt: 1
              If enabled, lmtpd will convert the recipient addresses to
              lowercase (up to a '+' character, if present).

          lmtp_exclude_specialuse: \Snoozed
              Don't allow delivery to folders with given special-use attributes.

              Note that "snoozing" of emails can currently only be done via the
              JMAP protocol, so delivery directly to the Snoozed mailbox is
              prohibited by default as it will not be moved back into INBOX
              automatically.

          lmtp_fuzzy_mailbox_match: 0
              If enabled, and the mailbox specified in the detail part of the
              recipient (everything after the '+') does not exist, lmtpd will
              try to find the closest match (ignoring case, ignoring whitespace,
              falling back to parent) to the specified mailbox name.

          lmtp_over_quota_perm_failure: 0
              If enabled, lmtpd returns a permanent failure code when a user's
              mailbox is over quota.  By default, the failure is temporary,
              causing the MTA to queue the message and retry later.

          lmtp_strict_quota: 0
              If enabled, lmtpd returns a failure code when the incoming message
              will cause the user's mailbox to exceed its quota.  By default,
              the failure won't occur until the mailbox is already over quota.

          lmtp_strict_rfc2821: 1
              By default, lmtpd will be strict (per RFC 2821) with regards to
              which envelope addresses are allowed.  If this option is set to
              false, 8bit characters in the local-part of envelope addresses are
              changed to 'X' instead.  This is useful to avoid generating
              backscatter with certain MTAs like Postfix or Exim which accept
              such messages.

          lmtpsocket: {configdirectory}/socket/lmtp
              Unix domain socket that lmtpd listens on, used by deliver(8). This
              should match the path specified in cyrus.conf(5).

          lmtptxn_timeout: 5m
              Timeout used during a lmtp transaction to a remote backend (e.g.
              in a murder environment).  Can be used to prevent hung lmtpds on
              proxy hosts when a backend server becomes unresponsive during a
              lmtp transaction.  The default is 5 minutes - change to zero for
              infinite.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          lock_debugtime: <none>
              A floating point number of seconds.  If set, time how long we wait
              for any lock, and syslog the filename and time if it's longer than
              this value.  The default of NULL means not to time locks.

          loginrealms: <empty string>
              The list of remote realms whose users may authenticate using
              cross-realm authentication identifiers.  Separate each realm name
              by a space.  (A cross-realm identity is considered any identity
              returned by SASL with an "@" in it.).

          loginuseacl: 0
              If enabled, any authentication identity which has a rights on a
              user's INBOX may log in as that user.

          logtimestamps: 0
              Include notations in the protocol telemetry logs indicating the
              number of seconds since the last command or response.

          mailbox_default_options: 0
              Default "options" field for the mailbox on create.  You'll want to
              know what you're doing before setting this, but it can apply some
              default annotations like duplicate suppression

          mailbox_initial_flags: <none>
              space-separated list of permanent flags which will be pre-set in
              every newly created mailbox.  If you know you will require
              particular flag names then this avoids a possible race condition
              against a client that fills the entire 128 available slots.
              Default is NULL, which is no flags.  Example: $Label1 $Label2
              $Label3 NotSpam Spam

          mailnotifier: <none>
              Notifyd(8) method to use for "MAIL" notifications.  If not set,
              "MAIL" notifications are disabled.

          master_bind_errors_fatal: 0
              If enabled, failure to bind a port during startup is treated as a
              fatal error, causing master to shut down immediately.  The default
              is to keep running, with the affected service disabled until the
              next SIGHUP causes it to retry.

              Note that this only applies during startup.  New services that
              fail to come up in response to a reconfig+SIGHUP will just be
              logged and disabled like the default behaviour, without causing
              master to exit.

          maxheaderlines: 1000
              Maximum number of lines of header that will be processed into
              cache records.  Default 1000.  If set to zero, it is unlimited.
              If a message hits the limit, an error will be logged and the rest
              of the lines in the header will be skipped.  This is to avoid
              malformed messages causing giant cache records

          maxlogins_per_host: 0
              Maximum number of logged in sessions allowed per host, zero means
              no limit

          maxlogins_per_user: 0
              Maximum number of logged in sessions allowed per user, zero means
              no limit

          maxmessagesize: 0
              Maximum incoming LMTP message size.  If non-zero, lmtpd will
              reject messages larger than maxmessagesize bytes.  If set to 0,
              this will allow messages of any size (the default).

          maxquoted: 131072
              Maximum size of a single quoted string for the parser.  Default
              128k

          maxword: 131072
              Maximum size of a single word for the parser.  Default 128k

          mboxkey_db: twoskip
              The cyrusdb backend to use for mailbox keys.

              Allowed values: skiplist, twoskip, zeroskip

          mboxlist_db: twoskip
              The cyrusdb backend to use for the mailbox list.

              Allowed values: flat, skiplist, sql, twoskip, zeroskip

          mboxlist_db_path: <none>
              The absolute path to the mailboxes db file.  If not specified will
              be configdirectory/mailboxes.db

          mboxname_lockpath: <none>
              Path to mailbox name lock files (default $conf/lock)

          metapartition_files: <empty string>
              Space-separated list of metadata files to be stored on a
              metapartition rather than in the mailbox directory on a spool
              partition.  Allowed values: header, index, cache, expunge, squat,
              annotations, lock, dav, archivecache

          metapartition-name: <none>
              The pathname of the metadata partition name, corresponding to
              spool partition partition-name.  For any mailbox residing in a
              directory on partition-name, the metadata files listed in
              metapartition_files will be stored in a corresponding directory on
              metapartition-name.   Note that not every partition-name option is
              required to have a corresponding metapartition-name option, so
              that you can selectively choose which spool partitions will have
              separate metadata partitions.

          mupdate_authname: <none>
              The SASL username (Authentication Name) to use when authenticating
              to the mupdate server (if needed).

          mupdate_config: standard
              The configuration of the mupdate servers in the Cyrus Murder.  The
              "standard" config is one in which there are discreet frontend
              (proxy) and backend servers.  The "unified" config is one in which
              a server can be both a frontend and backend.  The "replicated"
              config is one in which multiple backend servers all share the same
              mailspool, but each have their own "replicated" copy of
              mailboxes.db.  Allowed values: standard, unified, replicated

          munge8bit: 1
              If enabled, lmtpd munges messages with 8-bit characters in the
              headers.  The 8-bit characters are changed to `X'.  If reject8bit
              is enabled, setting munge8bit has no effect.  (A proper solution
              to non-ASCII characters in headers is offered by RFC 2047 and its
              predecessors.)

          mupdate_connections_max: 128
              The max number of connections that a mupdate process will allow,
              this is related to the number of file descriptors in the mupdate
              process.  Beyond this number connections will be immediately
              issued a BYE response.

          mupdate_password: <none>
              The SASL password (if needed) to use when authenticating to the
              mupdate server.

          mupdate_port: 3905
              The port of the mupdate server for the Cyrus Murder

          mupdate_realm: <none>
              The SASL realm (if needed) to use when authenticating to the
              mupdate server.

          mupdate_retry_delay: 20
              The base time to wait between connection retries to the mupdate
              server.

          mupdate_server: <none>
              The mupdate server for the Cyrus Murder

          mupdate_username: <empty string>
              The SASL username (Authorization Name) to use when authenticating
              to the mupdate server

          mupdate_workers_max: 50
              The maximum number of mupdate worker threads (overall)

          mupdate_workers_maxspare: 10
              The maximum number of idle mupdate worker threads

          mupdate_workers_minspare: 2
              The minimum number of idle mupdate worker threads

          mupdate_workers_start: 5
              The number of mupdate worker threads to start

          netscapeurl: <none>
              If enabled at compile time, this specifies a URL to reply when
              Netscape asks the server where the mail administration HTTP server
              is.  Administrators should set this to a local resource.

          newsaddheaders: to
              Space-separated list of headers to be added to incoming usenet
              articles.  Added To: headers will contain email delivery addresses
              corresponding to each newsgroup in the Newsgroups: header.  Added
              Reply-To: headers will contain email delivery addresses
              corresponding to each newsgroup in the Followup-To: or Newsgroups:
              header.  If the specified header(s) already exist in an article,
              the email delivery addresses will be appended to the original
              header body(s).

              This option applies if and only if the newspostuser option is set.
              Allowed values: to, replyto

          newsgroups: *
              A wildmat pattern specifying which mailbox hierarchies should be
              treated as newsgroups.  Only mailboxes matching the wildmat will
              accept and/or serve articles via NNTP.  If not set, a default
              wildmat of "*" (ALL shared mailboxes) will be used.  If the
              newsprefix option is also set, the default wildmat will be
              translated to "<newsprefix>.*"

          newsmaster: news
              Userid that is used for checking access controls when executing
              Usenet control messages.  For instance, to allow articles to be
              automatically deleted by cancel messages, give the "news" user the
              'd' right on the desired mailboxes.  To allow newsgroups to be
              automatically created, deleted and renamed by the corresponding
              control messages, give the "news" user the 'c' right on the
              desired mailbox hierarchies.

          newspeer: <none>
              A list of whitespace-separated news server specifications to which
              articles should be fed.  Each server specification is a string of
              the form [user[:pass]@]host[:port][/wildmat] where 'host' is the
              fully qualified hostname of the server, 'port' is the port on
              which the server is listening, 'user' and 'pass' are the
              authentication credentials and 'wildmat' is a pattern that
              specifies which groups should be fed.  If no 'port' is specified,
              port 119 is used.  If no 'wildmat' is specified, all groups are
              fed.  If 'user' is specified (even if empty), then the NNTP POST
              command will be used to feed the article to the server, otherwise
              the IHAVE command will be used.

              A '@' may be used in place of '!' in the wildmat to prevent
              feeding articles cross-posted to the given group, otherwise
              cross-posted articles are fed if any part of the wildmat matches.
              For example, the string "peer.example.com:*,!control.*,@local.*"
              would feed all groups except control messages and local groups to
              peer.example.com.  In the case of cross-posting to local groups,
              these articles would not be fed.

          newspostuser: <none>
              Userid used to deliver usenet articles to newsgroup folders
              (usually via lmtp2nntp).  For example, if set to "post", email
              sent to "post+comp.mail.imap" would be delivered to the
              "comp.mail.imap" folder.

              When set, the Cyrus NNTP server will add the header(s) specified
              in the newsaddheaders option to each incoming usenet article.  The
              added header(s) will contain email delivery addresses
              corresponding to each relevant newsgroup.  If not set, no headers
              are added to usenet articles.

          newsprefix: <none>
              Prefix to be prepended to newsgroup names to make the
              corresponding IMAP mailbox names.

          newsrc_db_path: <none>
              The absolute path to the newsrc db file.  If not specified, will
              be configdirectory/fetchnews.db

          nntptimeout: 3m
              Set the length of the NNTP server's inactivity autologout timer.
              The minimum value is 3 minutes, also the default.

              For backward compatibility, if no unit is specified, minutes is
              assumed.

          notesmailbox: <none>
              The top level mailbox in each user's account which is used to
              store * Apple-style Notes.  Default is blank (disabled)

          notifysocket: {configdirectory}/socket/notify
              Unix domain socket that the mail notification daemon listens on.

          notify_external: <none>
              Path to the external program that notifyd(8) will call to send
              mail notifications.

              The external program will be called with the following command
              line options:

                 -c class

                 -p priority

                 -u user

                 -m mailbox

                 And the notification message will be available on stdin.

          partition-name: <none>
              The pathname of the partition name.  At least one partition
              pathname MUST be specified.  If the defaultpartition option is
              used, then its pathname MUST be specified.  For example, if the
              value of the defaultpartion option is part1, then the
              partition-part1 field is required.

          partition_select_mode: freespace-most
              Partition selection mode.

              random (pseudo-)random selection

              freespace-most
                     partition with the most free space (KiB)

              freespace-percent-most
                     partition with the most free space (%)

              freespace-percent-weighted
                     each partition is weighted according to its free space (%);
                     the more free space the partition has, the more chances it
                     has to be selected

              freespace-percent-weighted-delta
                     each partition is weighted according to its difference of
                     free space (%) compared to the most used partition; the
                     more the partition is lagging behind the most used
                     partition, the more chances it has to be selected

                     Note that actually even the most used partition has a few
                     chances to be selected, and those chances increase when
                     other partitions get closer

                     Allowed values: random, freespace-most,
                     freespace-percent-most, freespace-percent-weighted,
                     freespace-percent-weighted-delta

          partition_select_exclude: <none>
              List of partitions to exclude from selection mode.

          partition_select_usage_reinit: 0
              For a given session, number of operations (e.g. partition
              selection) for which partitions usage data are cached.

          partition_select_soft_usage_limit: 0
              Limit of partition usage (%): if a partition is over that limit,
              it is automatically excluded from selection mode.

              If all partitions are over that limit, this feature is not used
              anymore.

          plaintextloginpause: <none>
              Time to pause after a successful plaintext login.  For systems
              that support strong authentication, this permits users to perceive
              a cost of using plaintext passwords.  (This does not affect the
              use of PLAIN in SASL authentications.)

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          plaintextloginalert: <none>
              Message to send to client after a successful plaintext login.

          popexpiretime: -1
              The duration advertised as being the minimum a message may be left
              on the POP server before it is deleted (via the CAPA command,
              defined in the POP3 Extension Mechanism, which some clients may
              support).  This duration has a granularity of whole days, with
              partial days truncated (so e.g. "45m" is effectively "0d").
              "NEVER", the default, may be specified with a negative number.

              The Cyrus POP3 server never deletes mail, no matter what the value
              of this parameter is.  However, if a site implements a less
              liberal policy, it needs to change this parameter accordingly.

              For backward compatibility, if no unit is specified, days is
              assumed.

          popminpoll: <none>
              Set the minimum amount of time the server forces users to wait
              between successive POP logins.

              For backward compatibility, if no unit is specified, minutes is
              assumed.

          popsubfolders: 0
              Allow access to subfolders of INBOX via POP3 by using
              userid+subfolder syntax as the authentication/authorization id.

          poppollpadding: 1
              Create a softer minimum poll restriction.  Allows poppollpadding
              connections before the minpoll restriction is triggered.
              Additionally, one padding entry is recovered every popminpoll
              minutes.  This allows for the occasional polling rate faster than
              popminpoll, (i.e., for clients that require a send/receive to send
              mail) but still enforces the rate long-term.  Default is 1
              (disabled).

              The easiest way to think of it is a queue of past connections,
              with one slot being filled for every connection, and one slot
              being cleared every popminpoll minutes. When the queue is full,
              the user will not be able to check mail again until a slot is
              cleared.  If the user waits a sufficient amount of time, they will
              get back many or all of the slots.

          poptimeout: 10m
              Set the length of the POP server's inactivity autologout timer.
              The minimum value is 10 minutes, the default.

              For backward compatibility, if no unit is specified, minutes is
              assumed.

          popuseacl: 0
              Enforce IMAP ACLs in the pop server.  Due to the nature of the
              POP3 protocol, the only rights which are used by the pop server
              are 'r', 't', and 's' for the owner of the mailbox.  The 'r' right
              allows the user to open the mailbox and list/retrieve messages.
              The 't' right allows the user to delete messages.  The 's' right
              allows messages retrieved by the user to have the \Seen flag set
              (only if popuseimapflags is also enabled).

          popuseimapflags: 0
              If enabled, the pop server will set and obey IMAP flags.  Messages
              having the \Deleted flag are ignored as if they do not exist.
              Messages that are retrieved by the client will have the \Seen flag
              set.  All messages will have the \Recent flag unset.

          postmaster: postmaster
              Username that is used as the 'From' address in rejection MDNs
              produced by sieve.

          postuser: <empty string>
              Userid used to deliver messages to shared folders.  For example,
              if set to "bb", email sent to "bb+shared.blah" would be delivered
              to the "shared.blah" folder.  By default, an email address of
              "+shared.blah" would be used.

          proc_path: <none>
              Path to proc directory.  Default is NULL - must be an absolute
              path if specified.  If not specified, the path
              $configdirectory/proc/ will be used.

          prometheus_enabled: 0
              Whether tracking of service metrics for Prometheus is enabled.

          prometheus_need_auth: admin
              Authentication level required to fetch Prometheus metrics.

              Allowed values: none, user, admin

          prometheus_update_freq: 10s
              Frequency in at which promstatsd should re-collate its statistics
              report.  The minimum value is 1 second, the default is 10 seconds.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          prometheus_stats_dir: <none>
              Directory to use for gathering prometheus statistics.  If
              specified, must be an absolute path.  If not specified, the
              default path $configdirectory/stats/ will be used.  It may be
              advantageous to locate this directory on ephemeral storage.

          proxy_authname: proxy
              The authentication name to use when authenticating to a backend
              server in the Cyrus Murder.

          proxy_compress: 0
              Try to enable protocol-specific compression when performing a
              client connection to a backend server in the Cyrus Murder.

              Note that this should only be necessary over slow network
              connections.  Also note that currently only IMAP and MUPDATE
              support compression.

          proxy_password: <none>
              The default password to use when authenticating to a backend
              server in the Cyrus Murder.  May be overridden on a host-specific
              basis using the hostname_password option.

          proxy_realm: <none>
              The authentication realm to use when authenticating to a backend
              server in the Cyrus Murder

          proxyd_allow_status_referral: 0
              Set to true to allow proxyd to issue referrals to clients that
              support it when answering the STATUS command.  This is disabled by
              default since some clients issue many STATUS commands in a row,
              and do not cache the connections that these referrals would cause,
              thus resulting in a higher authentication load on the respective
              backend server.

          proxyd_disable_mailbox_referrals: 0
              Set to true to disable the use of mailbox-referrals on the proxy
              servers.

          proxyservers: <none>
              A list of users and groups that are allowed to proxy for other
              users, separated by spaces.  Any user listed in this will be
              allowed to login for any other user: use with caution.  In a
              standard murder this option should ONLY be set on backends.  DO
              NOT SET on frontends or things won't work properly.

          pts_module: afskrb
              The PTS module to use.

              Allowed values: afskrb, ldap

          ptloader_sock: <none>
              Unix domain socket that ptloader listens on.  (defaults to
              configdirectory/ptclient/ptsock)

          ptscache_db: twoskip
              The cyrusdb backend to use for the pts cache.

              Allowed values: skiplist, twoskip, zeroskip

          ptscache_db_path: <none>
              The absolute path to the ptscache db file.  If not specified, will
              be configdirectory/ptscache.db

          ptscache_timeout: 3h
              The timeout for the PTS cache database when using the auth_krb_pts
              authorization method (default: 3 hours).

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          ptskrb5_convert524: 1
              When using the AFSKRB ptloader module with Kerberos 5
              canonicalization, do the final 524 conversion to get a n AFS style
              name (using '.' instead of '/', and using short names

          ptskrb5_strip_default_realm: 1
              When using the AFSKRB ptloader module with Kerberos 5
              canonicalization, strip the default realm from the userid (this
              does not affect the stripping of realms specified by the
              afspts_localrealms option)

          qosmarking: cs0
              This specifies the Class Selector or Differentiated Services Code
              Point designation on IP headers (in the ToS field).  Allowed
              values: cs0, cs1, cs2, cs3, cs4, cs5, cs6, cs7, af11, af12, af13,
              af21, af22, af23, af31, af32, af33, af41, af42, af43, ef

          quota_db: quotalegacy
              The cyrusdb backend to use for quotas.

              Allowed values: flat, skiplist, sql, quotalegacy, twoskip,
              zeroskip

          quota_db_path: <none>
              The absolute path for the quota database (if you choose a
              single-file quota DB type - or the base path if you choose
              quotalegacy).  If not specified will be configdirectory/quotas.db
              or configdirectory/quota/

          quotawarn: 90
              The percent of quota utilization over which the server generates
              warnings.

          quotawarnkb: 0
              The maximum amount of free space (in kB) at which to give a quota
              warning (if this value is 0, or if the quota is smaller than this
              amount, then warnings are always given).

          quotawarnmsg: 0
              The maximum amount of messages at which to give a quota warning
              (if this value is 0, or if the quota is smaller than this amount,
              then warnings are always given).

          reject8bit: 0
              If enabled, lmtpd rejects messages with 8-bit characters in the
              headers.

          restore_authname: <none>
              The authentication used by the restore tool when authenticating to
              an IMAP/sync server.

          restore_password: <none>
              The password used by the restore tool when authenticating to an
              IMAP/sync server.

          restore_realm: <none>
              The authentication realm used by the restore tool when
              authenticating to an IMAP/sync server.

          reverseacls: 0
              At startup time, ctl_cyrusdb -r will check this value and it will
              either add or remove reverse ACL pointers from mailboxes.db

          rfc2046_strict: 0
              If enabled, imapd will be strict (per RFC 2046) when matching MIME
              boundary strings.  This means that boundaries containing other
              boundaries as substrings will be treated as identical.  Since
              enabling this option will break some messages created by Eudora
              5.1 (and earlier), it is recommended that it be left disabled
              unless there is good reason to do otherwise.

          rfc2047_utf8: 0
              If enabled, imapd will parse any non-encoded character sequence in
              MIME header values as UTF8. This is useful for installations that
              either advertise the UTF8SMTP (RFC 5335) extension or receive
              mails with improperly escaped UTF-8 byte sequences. It is
              recommended that this option is left disabled unless there is good
              reason to do otherwise.

          rfc3028_strict: 1
              If enabled, Sieve will be strict (per RFC 3028) with regards to
              which headers are allowed to be used in address and envelope
              tests.  This means that only those headers which are defined to
              contain addresses will be allowed in address tests and only "to"
              and "from" will be allowed in envelope tests.  When disabled, ANY
              grammatically correct header will be allowed.

          rss_feedlist_template: <none>
              File containing HTML that will be used as a template for
              displaying the list of available RSS feeds.  A single instance of
              the variable %RSS_FEEDLIST% should appear in the file, which will
              be replaced by a nested unordered list of feeds.  The toplevel
              unordered list will be tagged with an id of "feed" (<ul
              id='feed'>) which can be used by stylesheet(s) in your template.
              The dynamically created list of feeds based on the HTML template
              will be accessible at the "/rss" URL on the server.

          rss_feeds: *
              A wildmat pattern specifying which mailbox hierarchies should be
              treated as RSS feeds.  Only mailboxes matching the wildmat will
              have their messages available via RSS.  If not set, a default
              wildmat of "*" (ALL mailboxes) will be used.

          rss_maxage: <none>
              Maximum age of items to display in an RSS channel.  If non-zero,
              httpd will only display items received within this time period.
              If set to 0, all available items will be displayed (the default).

              For backward compatibility, if no unit is specified, days is
              assumed.

          rss_maxitems: 0
              Maximum number of items to display in an RSS channel.  If
              non-zero, httpd will display no more than the rss_maxitems most
              recent items.  If set to 0, all available items will be displayed
              (the default).

          rss_maxsynopsis: 0
              Maximum RSS item synopsis length.  If non-zero, httpd will display
              no more than the first rss_maxsynopsis characters of an item's
              synopsis.  If set to 0, the entire synopsis will be displayed (the
              default).

          rss_realm: <none>
              The realm to present for HTTP authentication of RSS feeds.  If not
              set (the default), the value of the "servername" option will be
              used.

          sasl_auto_transition: 0
              If enabled, the SASL library will automatically create
              authentication secrets when given a plaintext password.  See the
              SASL documentation.

          sasl_maximum_layer: 256
              Maximum SSF (security strength factor) that the server will allow
              a client to negotiate.

          sasl_minimum_layer: 0
              The minimum SSF that the server will allow a client to negotiate.
              A value of 1 requires integrity protection; any higher value
              requires some amount of encryption.

          sasl_option: 0
              Any SASL option can be set by preceding it with sasl_.  This file
              overrides the SASL configuration file.

          sasl_pwcheck_method: <none>
              The mechanism used by the server to verify plaintext passwords.
              Possible values include "auxprop", "saslauthd", and "pwcheck".

          search_batchsize: 20
              The number of messages to be indexed in one batch (default 20).
              Note that long batches may delay user commands or mail delivery.

          search_attachment_extractor_url: <none>
              Reserved for future use.

          search_index_language: 0
              Reserved for future use.

          search_index_parts: 0
              Deprecated. No longer used.

          search_query_language: 0
              Reserved for future use.

          search_normalisation_max: 1000
              A resource bound for the combinatorial explosion of search
              expression tree complexity caused by normalising expressions with
              many OR nodes.  These can use more CPU time to optimise than they
              save IO time in scanning folders.

          search_engine: none
              The indexing engine used to speed up searching.

              Allowed values: none, squat, xapian

          search_fuzzy_always: 0
              Whether to enable RFC 6203 FUZZY search for all IMAP SEARCH. If
              turned on, search attributes will be searched using FUZZY search
              by default.  If turned off, clients have to explicitly use the
              FUZZY search key to enable fuzzy search for regular SEARCH
              commands.

          search_index_headers: 1
              Whether to index headers other than From, To, Cc, Bcc, and
              Subject.  Experiment shows that some headers such as Received and
              DKIM-Signature can contribute up to 2/3rds of the index size but
              almost nothing to the utility of searching.  Note that if header
              indexing is disabled, headers can still be searched, the searches
              will just be slower.

          search_indexed_db: twoskip
              The cyrusdb backend to use for the search latest indexed uid
              state.  Xapian only.

              Allowed values: flat, skiplist, twoskip, zeroskip

          search_maxtime: <none>
              The maximum number of seconds to run a search for before aborting.
              Default of no value means search "forever" until other timeouts.

          search_queryscan: 5000
              The minimum number of records require to do a direct scan of all G
              keys * rather than indexed lookups.  A value of 0 means always do
              indexed lookups.

          search_skipdiacrit: 1
              When searching, should diacriticals be stripped from the search
              terms.  The default is "true", a search for "hav" will match
              "Håvard".  This is not RFC 5051 compliant, but it backwards
              compatible, and may be preferred by some sites.

          search_skiphtml: 0
              If enabled, HTML parts of messages are skipped, i.e. not indexed
              and not searchable.  Otherwise, they're indexed.

          search_whitespace: merge
              When searching, how whitespace should be handled.  Options are:
              "skip" (default in 2.3 and earlier series) - where a search for
              "equi" would match "the quick brown fox".  "merge" - the default,
              where "he  qu" would match "the quick   brownfox", and "keep",
              where whitespace must match exactly.  The default of "merge" is
              recommended for most cases - it's a good compromise which keeps
              words separate.  Allowed values: skip, merge, keep

          search_snippet_length: 255
              The maximum byte length of a snippet generated by the XSNIPPETS
              command. Only supported by the Xapian search backend, which
              attempts to always fill search_snippet_length bytes in the
              generated snippet.

          search_stopword_path: <none>
              The absolute base path to the search stopword lists. If not
              specified, no stopwords will be taken into account during search
              indexing. Currently, the only supported and default stop word file
              is english.txt.

          searchpartition-name: <none>
              The pathname where to store the xapian search indexes of
              searchtier for mailboxes of partition name. This must be
              configured for the defaultsearchtier and any additional search
              tier (see squatter for details).

              For example: if defaultpartition is defined as part1 and
              defaultsearchtier as tier1 then the configuration must contain an
              entry tier1searchpartition-part1 that defines the path where to
              store this tier1's search index for the part1 partition.

              This option MUST be specified for xapian search.

          seenstate_db: twoskip
              The cyrusdb backend to use for the seen state.

              Allowed values: flat, skiplist, twoskip, zeroskip

          sendmail: /usr/lib/sendmail
              The pathname of the sendmail executable.  Sieve invokes sendmail
              for sending rejections, redirects and vacation responses.

          sendmail_auth_id: CYRUS_SENDMAIL_AUTH_ID
              The name of an environment variable to set when invoking sendmail.
              The value of this environment variable will contain the user id of
              the currently authenticated user. If no user is authenticated the
              environment variable is not set.

          serverlist: <none>
              Whitespace separated list of backend server names.  Used for
              finding server with the most available free space for proxying
              CREATE.

          serverlist_select_mode: freespace-most
              Server selection mode.

              random (pseudo-)random selection

              freespace-most
                     backend with the most (total) free space (KiB)

              freespace-percent-most
                     backend whose partition has the most free space (%)

              freespace-percent-weighted
                     same as for partition selection, comparing the free space
                     (%) of the least used partition of each backend

              freespace-percent-weighted-delta
                     same as for partition selection, comparing the free space
                     (%) of the least used partition of each backend.

                     Allowed values: random, freespace-most,
                     freespace-percent-most, freespace-percent-weighted,
                     freespace-percent-weighted-delta

          serverlist_select_usage_reinit: 0
              For a given session, number of operations (e.g. backend selection)
              for which backend usage data are cached.

          serverlist_select_soft_usage_limit: 0
              Limit of backend usage (%): if a backend is over that limit, it is
              automatically excluded from selection mode.

              If all backends are over that limit, this feature is not used
              anymore.

          servername: <none>
              This is the hostname visible in the greeting messages of the POP,
              IMAP and LMTP daemons. If it is unset, then the result returned
              from gethostname(2) is used.  This is also the value used by
              murder clusters to identify the host name.  It should be
              resolvable by DNS to the correct host, and unique within an active
              cluster.  If you are using low level replication (e.g. drbd) then
              it should be the same on each copy and the DNS name should also be
              moved to the new master on failover.

          serverinfo: on
              The server information to display in the greeting and capability
              responses. Information is displayed as follows:
                 "off" = no server information in the greeting or capabilities

                 "min" = servername in the greeting; no server information in
                 the capabilities

                 "on" = servername and product version in the greeting; product
                 version in the capabilities

                 Allowed values: off, min, on

          sharedprefix: Shared Folders
              If using the alternate IMAP namespace, the prefix for the shared
              namespace.  The hierarchy delimiter will be automatically
              appended.

          sieve_allowreferrals: 1
              If enabled, timsieved will issue referrals to clients when the
              user's scripts reside on a remote server (in a Murder).
              Otherwise, timsieved will proxy traffic to the remote server.

          sieve_duplicate_max_expiration: 90d
              Maximum expiration time for duplicate message tracking records.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          sieve_extensions: fileinto reject vacation vacation-seconds imapflags
          notify include envelope environment body relational regex subaddress
          copy date index imap4flags mailbox mboxmetadata servermetadata
          variables editheader extlists duplicate ihave fcc special-use
          redirect-dsn redirect-deliverby mailboxid x-cyrus-log
          x-cyrus-jmapquery x-cyrus-snooze
              Space-separated list of Sieve extensions allowed to be used in
              sieve scripts, enforced at submission by timsieved(8).  Any
              previously installed script will be unaffected by this option and
              will continue to execute regardless of the extensions used.  This
              option has no effect on options that are disabled at compile time
              (e.g., "regex").  Allowed values: fileinto, reject, vacation,
              vacation-seconds, imapflags, notify, include, envelope,
              environment, body, relational, regex, subaddress, copy, date,
              index, imap4flags, mailbox, mboxmetadata, servermetadata,
              variables, editheader, extlists, duplicate, ihave, fcc,
              special-use, redirect-dsn, redirect-deliverby, mailboxid,
              x-cyrus-log, x-cyrus-jmapquery, x-cyrus-snooze

          sieve_maxscriptsize: 32
              Maximum size (in kilobytes) any sieve script can be, enforced at
              submission by timsieved(8).

          sieve_maxscripts: 5
              Maximum number of sieve scripts any user may have, enforced at
              submission by timsieved(8).

          sieve_utf8fileinto: 0
              If enabled, the sieve engine expects folder names for the fileinto
              action in scripts to use UTF8 encoding.  Otherwise, modified UTF7
              encoding should be used.

          sieve_sasl_send_unsolicited_capability: 0
              If enabled, timsieved will emit a capability response after a
              successful SASL authentication, per
              draft-martin-managesieve-12.txt .

          sieve_use_lmtp_reject: 1
              Enabled by default.  If reject can be done via LMTP, then return a
              550 rather than generating the bounce message in Cyrus.

          sieve_vacation_min_response: 3d
              Minimum time interval between consecutive vacation responses, per
              draft-ietf-vacation-seconds.txt.  The default is 3 days.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          sieve_vacation_max_response: 90d
              Maximum time interval between consecutive vacation responses, per
              draft-ietf-vacation-seconds.txt.  The default is 90 days.  The
              minimum is 7 days.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          sievedir: /usr/sieve
              If sieveusehomedir is false, this directory is searched for Sieve
              scripts.

          sievenotifier: <none>
              Notifyd(8) method to use for "SIEVE" notifications.  If not set,
              "SIEVE" notifications are disabled.

              This method is only used when no method is specified in the
              script.

          sieveusehomedir: 0
              If enabled, lmtpd will look for Sieve scripts in user's home
              directories: ~user/.sieve.

          anysievefolder: 0
              It must be "yes" in order to permit the autocreation of any INBOX
              subfolder requested by a sieve filter, through the "fileinto"
              action. (default = no)

          singleinstancestore: 1
              If enabled, imapd, lmtpd and nntpd attempt to only write one copy
              of a message per partition and create hard links, resulting in a
              potentially large disk savings.

          skiplist_always_checkpoint: 1
              If enabled, this option forces the skiplist cyrusdb backend to
              always checkpoint when doing a recovery.  This causes slightly
              more IO, but on the other hand leads to more efficient databases,
              and the entire file is already "hot".

          skiplist_unsafe: 0
              If enabled, this option forces the skiplist cyrusdb backend to not
              sync writes to the disk.  Enabling this option is NOT RECOMMENDED.

          smtp_backend: sendmail
              The SMTP backend to use for sending email.

              The "host" backend sends message submissions via a TCP socket to
              the SMTP host defined in the config option smtp_host.

              The "sendmail" backend forks the Cyrus process into the executable
              defined in the config option sendmail.  The executable must accept
              "-bs" as command line argument, read from stdin and must implement
              the minimum SMTP protocol as defined in section 4.5.1 of RFC 5321.

              If the SMTP EHLO command reports AUTH (RFC 4954) as a supported
              extension, then the MAIL FROM command includes the AUTH parameter,
              with its value set to the name of any authenticated user which
              triggered the email. The AUTH parameter is omitted if the user is
              unknown to the calling process.

              If the directory configdirectory/log/smtpclient.smtp_backend
              exists, then telemetry logs for outgoing SMTP sessions will be
              created in this directory.

              Allowed values: host, sendmail

          smtp_host: localhost:587
              The SMTP host to use for sending mail (also see the smtp_backend
              option). The value of this option must the name or IP address of a
              TCP host, followed optionally by a colon and the port or service
              to use. The default port is 587. TLS may be activated by appending
              "/tls" to the value. Authentication is enabled if
              smtp_auth_authname is set. Authentication can be explicitly
              disabled by appending "/noauth" to the host address.

          smtp_auth_authname: <none>
              The authentication name to use when authenticating to the SMTP
              server defined in smtp_host.

          smtp_auth_password: <none>
              The password to use when authenticating to the SMTP server defined
              in smtp_host.

          smtp_auth_realm: <none>
              The authentication SASL realm to use when authenticating to a SMTP
              server.

          soft_noauth: 1
              If enabled, lmtpd returns temporary failures if the client does
              not successfully authenticate.  Otherwise lmtpd returns permanent
              failures (causing the mail to bounce immediately).

          sortcache_db: twoskip
              The cyrusdb backend to use for caching sort results (currently
              only used for xconvmultisort) Allowed values: skiplist, twoskip,
              zeroskip

          specialuse_extra: <none>
              Whitespace separated list of extra special-use attributes that can
              be set on a mailbox. RFC 6154 currently lists what special-use
              attributes can be set. This allows extending that list in the
              future or adding your own if needed.

          specialuse_protect: \Archive \Drafts \Important \Junk \Sent \Trash
              Whitespace separated list of special-use attributes to protect the
              mailboxes for.  If set, don't allow mailboxes with these special
              use attributes to be deleted or renamed to have a different
              parent. Default is the built-in list

          specialusealways: 1
              If enabled, this option causes LIST and LSUB output to always
              include the XLIST "special-use" flags

          sql_database: <none>
              Name of the database which contains the cyrusdb table(s).

          sql_engine: <none>
              Name of the SQL engine to use.

              Allowed values: mysql, pgsql, sqlite

          sql_hostnames: <empty string>
              Comma separated list of SQL servers (in host[:port] format).

          sql_passwd: <none>
              Password to use for authentication to the SQL server.

          sql_user: <none>
              Username to use for authentication to the SQL server.

          sql_usessl: 0
              If enabled, a secure connection will be made to the SQL server.

          srs_alwaysrewrite: 0
              If true, perform SRS rewriting for ALL forwarding, even when not
              required.

          srs_domain: <none>
              The domain to use in rewritten addresses. This must point only to
              machines which know the encoding secret used by this system. When
              present, SRS is enabled.

          srs_hashlength: 0
              The hash length to generate in a rewritten address.

          srs_secrets: <none>
              A list of secrets with which to generate addresses.

          srs_separator: <none>
              The separator to appear immediately after SRS[01] in rewritten
              addresses.

          srvtab: <empty string>
              The pathname of srvtab file containing the server's private key.
              This option is passed to the SASL library and overrides its
              default setting.

          submitservers: <none>
              A list of users and groups that are allowed to resolve
              "urlauth=submit+" IMAP URLs, separated by spaces.  Any user listed
              in this will be allowed to fetch the contents of any valid
              "urlauth=submit+" IMAP URL: use with caution.

          subscription_db: flat
              The cyrusdb backend to use for the subscriptions list.

              Allowed values: flat, skiplist, twoskip, zeroskip

          suppress_capabilities: <none>
              Suppress the named capabilities from any capability response.  Use
              the exact case as it appears in the response, e.g.
              "suppress_capabilities: ESEARCH QRESYNC WITHIN XLIST
              LIST-EXTENDED" if you have a murder with 2.3.x backends and don't
              want clients being confused by new capabilities that some backends
              don't support.

          statuscache: 0
              Enable/disable the imap status cache.

          statuscache_db: twoskip
              The cyrusdb backend to use for the imap status cache.

              Allowed values: skiplist, sql, twoskip, zeroskip

          statuscache_db_path: <none>
              The absolute path to the statuscache db file.  If not specified,
              will be configdirectory/statuscache.db

          sync_authname: <none>
              The authentication name to use when authenticating to a sync
              server.  Prefix with a channel name to only apply for that channel

          sync_batchsize: 8192
              the number of messages to upload in a single mailbox replication.
              Default is 8192.  If there are more than this many messages
              appended to the mailbox, generate a synthetic partial state and
              send that.

          sync_host: <none>
              Name of the host (replica running sync_server(8)) to which
              replication actions will be sent by sync_client(8).  Prefix with a
              channel name to only apply for that channel

          sync_log: 0
              Enable replication action logging by lmtpd(8), imapd(8), pop3d(8),
              and nntpd(8).  The log {configdirectory}/sync/log is used by
              sync_client(8) for "rolling" replication.

          sync_log_chain: 0
              Enable replication action logging by sync_server as well, allowing
              chaining of replicas.  Use this on 'B' for A => B => C replication
              layout

          sync_log_channels: <none>
              If specified, log all events to multiple log files in directories
              specified by each "channel".  Each channel can then be processed
              separately, such as by multiple sync_client(8)s in a mesh
              replication scheme, or by squatter(8) for rolling search index
              updates.

              You can use "" (the two-character string U+22 U+22) to mean the
              default sync channel.

          sync_log_unsuppressable_channels: squatter
              If specified, the named channels are exempt from the effect of
              setting sync_log_chain:off, i.e. they are always logged to by the
              sync_server process.  This is only really useful to allow rolling
              search indexing on a replica.

          sync_password: <none>
              The default password to use when authenticating to a sync server.
              Prefix with a channel name to only apply for that channel

          sync_port: <none>
              Name of the service (or port number) of the replication service on
              replica host.  Prefix with a channel name to only apply for that
              channel.  If not specified, and if sync_try_imap is set to "yes"
              (the default), then the replication client will first try "imap"
              (port 143) to check if imapd supports replication.  otherwise it
              will default to "csync" (usually port 2005).

          sync_realm: <none>
              The authentication realm to use when authenticating to a sync
              server.  Prefix with a channel name to only apply for that channel

          sync_repeat_interval: 1s
              Minimum interval between replication runs in rolling replication
              mode. If a replication run takes longer than this time, we repeat
              immediately.  Prefix with a channel name to only apply for that
              channel.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          sync_shutdown_file: <none>
              Simple latch used to tell sync_client(8) that it should shut down
              at the next opportunity. Safer than sending signals to running
              processes.  Prefix with a channel name to only apply for that
              channel

          sync_timeout: 30m
              How long to wait for a response before returning a timeout failure
              when talking to a replication peer (client or server).  The
              minimum duration is 3 seconds, the default is 30 minutes.

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          sync_try_imap: 1
              Whether sync_client should try to perform an IMAP connection
              before falling back to csync.  If this is set to "no", sync_client
              will only use csync.  Prefix with a channel name to apply only for
              that channel

          syslog_prefix: <none>
              String to be prepended to the process name in syslog entries. Can
              be further overridden by setting the $CYRUS_SYSLOG_PREFIX
              environment variable.

              Using the $CYRUS_SYSLOG_PREFIX environment variable has the
              additional advantage that it can be set before the imapd.conf is
              read, so errors while reading the config file can be syslogged
              with the correct prefix.

          syslog_facility: <none>
              Configure a syslog facility.  The default is whatever is compiled
              in.  Allowed values are: DAEMON, MAIL, NEWS, USER, and LOCAL0
              through to LOCAL7

          tcp_keepalive: 0
              Enable keepalive on TCP connections

          tcp_keepalive_cnt: 0
              Number of TCP keepalive probes to send before declaring the
              connection dead (0 == system default)

          tcp_keepalive_idle: 0
              How long a connection must be idle before keepalive probes are
              sent (0 == system default).

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          tcp_keepalive_intvl: 0
              Time between keepalive probes (0 == system default).

              For backward compatibility, if no unit is specified, seconds is
              assumed.

          temp_path: /tmp
              The pathname to store temporary files in

          telemetry_bysessionid: 0
              If true, log by sessionid instead of PID for telemetry

          timeout: 32m
              The length of the IMAP server's inactivity autologout timer.  The
              minimum value is 30 minutes.  The default is 32 minutes, to allow
              a bit of leeway for clients that try to NOOP every 30 minutes.

              For backward compatibility, if no unit is specified, minutes is
              assumed.

          imapidletimeout: <none>
              Timeout for idling clients (RFC 2177).  If not set (the default),
              the value of "timeout" will be used instead.

              For backward compatibility, if no unit is specified, minutes is
              assumed.

          tls_ca_file: <none>
              Deprecated in favor of tls_client_ca_file.

          tls_ca_path: <none>
              Deprecated in favor of tls_client_ca_dir.

          tlscache_db: twoskip
              Deprecated in favor of tls_sessions_db.

          tlscache_db_path: <none>
              Deprecated in favor of tls_sessions_db_path.

          tls_cert_file: <none>
              Deprecated in favor of tls_server_cert.

          tls_cipher_list: DEFAULT
              Deprecated in favor of tls_ciphers.

          tls_ciphers: DEFAULT
              The list of SSL/TLS ciphers to allow.  The format of the string
              (and definition of "DEFAULT") is described in ciphers(1).

              See also Mozilla's server-side TLS recommendations:

              https://wiki.mozilla.org/Security/Server_Side_TLS

          tls_crl_file: <none>
              Path to a file containing the Certificate Revocation List

          tls_client_ca_dir: <none>
              Path to a directory containing the CA certificates used to verify
              client SSL certificates used for authentication.

          tls_client_ca_file: <none>
              Path to a file containing the CA certificate(s) used to verify
              client SSL certificates used for authentication.

          tls_client_cert: <none>
              File containing the certificate presented to a server for
              authentication during STARTTLS. A value of "disabled" will disable
              this server's use of certificate-based authentication.

          tls_client_certs: optional
              Disable ("off"), allow ("optional", default) or require
              ("require") the use of SSL certificates by clients to authenticate
              themselves.  Allowed values: off, optional, require

          tls_client_key: <none>
              File containing the private key belonging to the tls_client_cert
              certificate. A value of "disabled" will disable this server's use
              of certificate-based authentication.

          tls_eccurve: prime256v1
              The elliptic curve used for ECDHE. Default is NIST Suite B
              prime256.  See 'openssl ecparam -list_curves' for possible values.

          tls_key_file: <none>
              Deprecated in favor of tls_server_key.

          tls_required: 0
              If enabled, require a TLS/SSL encryption layer to be negotiated
              prior to ANY authentication mechanisms being advertised or
              allowed.

          tls_prefer_server_ciphers: 0
              Prefer the ciphers on the server side instead of client side.

          tls_server_ca_dir: <none>
              Path to a directory with CA certificates used to verify
              certificates offered by the server, when cyrus acts as client.
              This directory must have filenames with the hashed value of the
              certificates (see openssl(1)).

          tls_server_ca_file: <none>
              Path to a file containing CA certificates used to verify
              certificates offered by the server, when cyrus acts as client.

          tls_server_cert: <none>
              File containing the certificate, including the full chain,
              presented to clients.  Two certificates can be set, e.g RSA and
              EC, if the filenames are separated with comma without spaces.

          tls_server_dhparam: <none>
              File containing the DH parameters belonging to the certificate in
              tls_server_cert.

          tls_server_key: <none>
              File containing the private key belonging to the certificate in
              tls_server_cert.  If not set, tls_server_cert must contain both
              private and public key.  Two files with keys can be set, if two
              certifates are used, in which case the files must be separated
              with comma without spaces

          tls_sessions_db: twoskip
              The cyrusdb backend to use for the TLS cache.

              Allowed values: skiplist, sql, twoskip, zeroskip

          tls_sessions_db_path: <none>
              The absolute path to the TLS sessions db file. If not specified,
              will be configdirectory/tls_sessions.db

          tls_session_timeout: 24h
              The length of time that a TLS session will be cached for later
              reuse.  The maximum value is 24 hours, also the default.  A value
              of 0 will disable session caching.

              For backward compatibility, if no unit is specified, minutes is
              assumed.

          tls_versions: tls1_0 tls1_1 tls1_2 tls1_3
              A list of SSL/TLS versions to not disable. Cyrus IMAP SSL/TLS
              starts with all protocols, and subtracts protocols not in this
              list. Newer versions of SSL/TLS will need to be added here to
              allow them to get disabled.

          uidl_format: cyrus
              Choose the format for UIDLs in pop3.  Possible values are
              "uidonly", "cyrus", "dovecot" and "courier".  "uidonly" forces the
              old default of UID, "cyrus" is UIDVALIDITY.UID.  Dovecot is 8
              digits of leading hex (lower case) each UID UIDVALIDITY. Courier
              is UIDVALIDITY-UID.  Allowed values: uidonly, cyrus, dovecot,
              courier

          umask: 077
              The umask value used by various Cyrus IMAP programs.

          userdeny_db: flat
              The cyrusdb backend to use for the user access list.

              Allowed values: flat, skiplist, sql, twoskip, zeroskip

          userdeny_db_path: <none>
              The absolute path to the userdeny db file.  If not specified, will
              be configdirectory/user_deny.db

          username_tolower: 1
              Convert usernames to all lowercase before login/authentication.
              This is useful with authentication backends which ignore case
              during username lookups (such as LDAP).

          userprefix: Other Users
              If using the alternate IMAP namespace, the prefix for the other
              users namespace.  The hierarchy delimiter will be automatically
              appended.

          unix_group_enable: 1
              Should we look up groups when using auth_unix (disable this if you
              are not using groups in ACLs for your IMAP server, and you are
              using auth_unix with a backend (such as LDAP) that can make
              getgrent() calls very slow)

          unixhierarchysep: 1
              Use the UNIX separator character '/' for delimiting levels of
              mailbox hierarchy.  Turn off to use the netnews separator
              character '.'. Note that with the newnews separator, no dots may
              occur in mailbox names.  The default switched in 3.0 from off to
              on.

          virtdomains: off
              Configure virtual domain support.

              off    Cyrus does not know or care about domains. Only the local
                     part of email addresses is ever considered.  This is not
                     recommended for any deployment, but is currently the
                     default.

              userid The user's domain is determined by splitting a fully
                     qualified userid at the last '@' or '%' symbol.  If the
                     userid is unqualified, the defaultdomain will be used.
                     This is the recommended configuration for all deployments.
                     If you wish to provide calendaring services you must use
                     this configuration.

              on     Fully qualified userids are respected, as per "userid".
                     Unqualified userids will have their domain determined by
                     doing a reverse lookup on the IP address of the incoming
                     network interface, or if no record is found, the
                     defaultdomain will be used.

                     Allowed values: off, userid, on

          virusscan_notification_subject: Automatically deleted mail
              The text used in the subject of email notifications created by
              cyr_virusscan(8) when deleting infected mail.

          virusscan_notification_template: <none>
              The absolute path to a file containing a template to use to
              describe infected messages that have been deleted by
              cyr_virusscan(8).  See cyr_virusscan(8) for specification of the
              format of this file.  If not specified, the builtin default
              template will be used.

          xbackup_enabled: 0
              Enable support for the XBACKUP command in imapd.  If enabled,
              admin users can use this command to provoke a replication of
              specified users to the named backup channel.

          xlist-flag: <none>
              Set the special-use flag flag on the specified folder when it is
              autocreated (see the autocreate_inbox_folders option).  For
              example, if xlist-junk: Spam is set, and the folder Spam is
              autocreated, the special-use flag \Junk will be set on it.

              (This option is so named for backward compatibility with old
              config files.)

          lmtp_catchall_mailbox: <none>
              Mail sent to mailboxes which do not exist, will be delivered to
              this user.  NOTE: This must be an existing local user name with an
              INBOX, NOT an email address!

          zoneinfo_db: twoskip
              The cyrusdb backend to use for zoneinfo.  This database is used by
              the "tzdist" httpmodules, and is managed by ctl_zoneinfo(8).
              Allowed values: flat, skiplist, twoskip, zeroskip

          zoneinfo_db_path: <none>
              The absolute path to the zoneinfo db file.  If not specified, will
              be configdirectory/zoneinfo.db

          zoneinfo_dir: <none>
              The absolute path to the zoneinfo directory, containing timezone
              definitions as generated by the vzic tool.  If not specified,
              whatever definitions libical finds will be used.

              If you are providing a Time Zone Data Distribution Service (i.e.
              you have "tzdist" listed in httpmodules), then this configuration
              option MUST be specified.

          object_storage_enabled: 0
              Is Object storage enabled for this server.  You also need to have
              archiving enabled and archivepartition for the mailbox.  Only
              email files will be stored on object Storage archive partition
              will be used to store any other files

          object_storage_dummy_spool: <none>
              Dummy object storage spool; this is for test only.  Spool where
              user directory (container) will be created to store all emails in
              a flat structure

          openio_namespace: <none>
              The OpenIO namespace used to store archived email messages. A
              namespace identifies the physical platform cyrus must contact.
              This directive is used by the OpenIO's SDK to locate its platform
              entry point.

          openio_account: <none>
              The OpenIO account used to account for stored emails. Accounts are
              unique in their namespace. They provides virtual partitions, with
              quotas and QoS features.

          openio_rawx_timeout: 30s
              The OpenIO timeout to query to the RAWX services (default 30 sec).

          openio_proxy_timeout: 5s
              The OpenIO timeout to query to the PROXY services (default 5 sec).

          openio_autocreate: 0
              Allow the OpenIO SDK to autocreate containers. Mainly destined to
              be turned on development environments. In production, the
              container should have been provisioned with the mailboxes.

          openio_verbosity: <none>
              Sets the logging verbosity of the OpenIO's internal behavior.
              Admissible values are: "warning", "notice", "info", "debug",
              "trace", "quiet".  The default verbosity is "warning". Set to
              "notice" for a few lines on a per-client basis. Set to "info" for
              a few lines on a per-request basis. Set to "debug" Set to "trace"
              to activate the underlying libcurl debug output. Enabling a
              verbosity higher to equal than "debug" requires the cyrus to be
              set in debug mode. The special "quiet" value disables all kinds of
              logging at the GLib level.

          caringo_hostname: <none>
              The Caringo hostname used to store archived email messages. A
              hostname identifies the physical platform cyrus must contact. This
              directive is used by the Caringo's SDK (CastorSDK: Caringo Simple
              Content Storage Protocol (SCSP) on HTTP 1.1 using a RESTful
              architecture

          caringo_port: 80
              The port of the caringo server (caringo_hostname); default is 80.

          fastmailsharing: 0
              If enabled, use FastMail style sharing (oldschool full server
              paths)

SEE ALSO
          imapd(8), pop3d(8), nntpd(8), lmtpd(8), httpd(8), timsieved(8),
          idled(8), notifyd(8), deliver(8), master(8), ciphers(1)

AUTHOR
       The Cyrus Team

COPYRIGHT
       1993-2018, The Cyrus Team



3.2.6                            March 09, 2021                    IMAPD.CONF(5)