# imapd.conf¶

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.

## 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 calendar 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.

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.

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: 0

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.

annotation_db: twoskip

The cyrusdb backend to use for mailbox annotations.

Allowed values: berkeley, berkeley-hash, skiplist, twoskip

annotation_db_path: <none>

The absolute path to the annotations db file. If not specified, will be confdir/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.

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: <none>

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_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.

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_inbox_folders is a list of INBOX’s subfolders separated by a “|”, that are automatically created by the server under the previous two scenarios. Leading and trailing whitespace is stripped, so “Junk | Trash” results in two folders: “Junk” and “Trash”.

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.

berkeley_cachesize: 512

Size (in kilobytes) of the shared memory buffer pool (cache) used by the berkeley environment. The minimum allowed value is 20. The maximum allowed value is 4194303 (4GB).

berkeley_locks_max: 50000

Maximum number of locks to be held or requested in the berkeley environment.

berkeley_txns_max: 100

Maximum number of transactions to be supported in the berkeley environment.

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_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_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.

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.

chatty: 0

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

client_timeout: 10

Number of seconds to wait before returning a timeout failure when performing a client connection (e.g., in a murder environment)

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.

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.

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 (without path). 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: <none>

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.

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

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_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: berkeley, berkeley-nosync, berkeley-hash, berkeley-hash-nosync, skiplist, sql, twoskip

duplicate_db_path: <none>

The absolute path to the duplicate db file. If not specified, will be confdir/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.mbtype, vnd.cmu.davFilename, vnd.cmu.davUid

event_groups: message mailbox

Space-separated list of groups of related events to turn on notification

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

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. “default” 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. (Note that this behaviour is no longer the default, but is so named for historical reasons.) 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 “default” 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: default, immediate, delayed

failedloginpause: 3

Number of seconds to pause after a failed login.

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: 20

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

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). Allowed values: caldav, carddav, domainkey, ischedule, rss, timezone

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: 5

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

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: 60

The interval (in seconds) 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. A value of 0 will disable IDLE.

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.

implicit_owner_rights: lkxa

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.

internaldate_heuristic: standard

Mechanism to determine email internaldates on delivery/reconstruct. “standard” uses time() when delivering a message, mtime on reconstruct. “receivedheader” looks at the top most Received header or time/mtime otherwise Allowed values: standard, receivedheader

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 %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>

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: 5

Specify a number of seconds for a search request to complete.

ldap_timeout: 5

Specify a number of seconds a search can take before timing out.

ldap_ca_dir: <none>

Path to a directory with CA (Certificate Authority) certificates.

ldap_ca_file: <none>

Patch to a file containing CA (Certificate Authority) certificate(s).

ldap_client_cert: <none>

File containing the client certificate.

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_ciphers: <none>

List of SSL/TLS ciphers to allow. The format of the string is described in ciphers(1).

ldap_client_key: <none>

File containing the private client key.

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: <none>

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.

lmtp_downcase_rcpt: 1

If enabled, lmtpd will convert the recipient addresses to lowercase (up to a ‘+’ character, if present).

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: 300

Timeout (in seconds) 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 300 - change to zero for infinite.

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 supression

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 $Label3 NotSpam Spam mailnotifier: <none> Notifyd(8) method to use for “MAIL” notifications. If not set, “MAIL” notifications are disabled. maxheaderlines: 1000 Maximum number of lines of header that will be processed into cache records. Default 1000. If set to zero, it is unlimited. If a message hits the limit, an error will be logged and the rest of the lines in the header will be skipped. This is to avoid malformed messages causing giant cache records maxlogins_per_host: 0 Maximum number of logged in sessions allowed per host, zero means no limit maxlogins_per_user: 0 Maximum number of logged in sessions allowed per user, zero means no limit maxmessagesize: 0 Maximum incoming LMTP message size. If non-zero, lmtpd will reject messages larger than maxmessagesize bytes. If set to 0, this will allow messages of any size (the default). maxquoted: 131072 Maximum size of a single quoted string for the parser. Default 128k maxword: 131072 Maximum size of a single word for the parser. Default 128k mboxkey_db: twoskip The cyrusdb backend to use for mailbox keys. Allowed values: berkeley, skiplist, twoskip mboxlist_db: twoskip The cyrusdb backend to use for the mailbox list. Allowed values: flat, berkeley, berkeley-hash, skiplist, sql, twoskip mboxlist_db_path: <none> The absolute path to the mailboxes db file. If not specified will be confdir/mailboxes.db mboxname_lockpath: <none> Path to mailbox name lock files (default$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

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

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 relevent 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 confdir/fetchnews.db

nntptimeout: 3

Set the length of the NNTP server’s inactivity autologout timer, in minutes. The minimum value is 3, the default.

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 default, then the partition-default 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: 0

Number of seconds 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.)

plaintextloginalert: <none>

Message to send to client after a successful plaintext login.

popexpiretime: -1

The number of days 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). “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.

popminpoll: 0

Set the minimum amount of time the server forces users to wait between successive POP logins, in minutes.

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: 10

Set the length of the POP server’s inactivity autologout timer, in minutes. The minimum value is 10, the default.

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 \$confdir/proc/ will be used.

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 configdir/ptclient/ptsock)

ptscache_db: twoskip

The cyrusdb backend to use for the pts cache.

Allowed values: berkeley, berkeley-hash, skiplist, twoskip

ptscache_db_path: <none>

The absolute path to the ptscache db file. If not specified, will be confdir/ptscache.db

ptscache_timeout: 10800

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

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, berkeley, berkeley-hash, skiplist, sql, quotalegacy, twoskip

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 confdir/quota.db or confdir/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.

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.

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: 0

Maximum age (in days) of items to display in an RSS channel. If non-zero, httpd will only display items received within the last rss_maxage days. If set to 0, all available items will be displayed (the default).

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_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 complient, but it backwards compatible, and may be preferred by some sites.

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

seenstate_db: twoskip

The cyrusdb backend to use for the seen state.

Allowed values: flat, berkeley, berkeley-hash, skiplist, twoskip

sendmail: /usr/lib/sendmail

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

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

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

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.

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).

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.

specialusealways: 0

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.

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, berkeley, berkeley-hash, skiplist, twoskip

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: berkeley, berkeley-nosync, berkeley-hash, berkeley-hash-nosync, skiplist, sql, twoskip

statuscache_db_path: <none>

The absolute path to the statuscache db file. If not specified, will be confdir/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_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”. To run these log files, you need to pass the -n option to sync_client -r with the channel name. Use this for a mesh style replication layout - every machine replicating to every other machine. 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: csync

Name of the service (or port number) of the replication service on replica host. The default is “csync” which is usally port 2005, but any service name or numeric port can be specified. Prefix with a channel name to only apply for that channel

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: 1

Minimum interval (in seconds) 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

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: 1800

Number of seconds to wait for a response before returning a timeout failure when talking to a replication peer (client or server).

syslog_prefix: <none>

String to be prepended to the process name in syslog entries.

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

Number of seconds a connection must be idle before keepalive probes are sent (0 == system default)

tcp_keepalive_intvl: 0

Number of seconds between keepalive probes (0 == system default)

temp_path: /tmp

The pathname to store temporary files in

timeout: 30

The length of the IMAP server’s inactivity autologout timer, in minutes. The minimum value is 30, the default.

imapidletimeout: 0

Timeout for idling clients (RFC 2177) in minutes. If set to zero (the default) or less, the value of “timeout” will be used instead.

tls_ca_file: DEFAULT

Deprecated in favor of tls_client_ca_file.

tls_ca_path: DEFAULT

Deprecated in favor of tls_client_ca_dir.

tlscache_db: DEFAULT

Deprecated in favor of tls_sessions_db.

tlscache_db_path: DEFAULT

Deprecated in favor of tls_sessions_db_path.

tls_cert_file: DEFAULT

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 is described in ciphers(1).

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: DEFAULT

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 when this server connects to other servers. 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 when this server connects to other servers.

tls_server_cert: <none>

File containing the certificate presented to clients.

tls_server_key: <none>

File containing the private key belonging to the certificate in tls_server_cert.

tls_sessions_db: twoskip

The cyrusdb backend to use for the TLS cache.

Allowed values: berkeley, berkeley-nosync, berkeley-hash, berkeley-hash-nosync, skiplist, sql, twoskip

tls_sessions_db_path: <none>

The absolute path to the TLS sessions db file. If not specified, will be confdir/tls_sessions.db

tls_session_timeout: 1440

The length of time (in minutes) that a TLS session will be cached for later reuse. The maximum value is 1440 (24 hours), the default. A value of 0 will disable session caching.

tls_versions: tls1_0 tls1_1 tls1_2

A list of SSL/TLS versions to not disable. Cyrus IMAP SSL/TLS starts with all protocols, and substracts protocols not in this list. Newer versions of SSL/TLS will need to be added here to allow them to get disabled.

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, berkeley, berkeley-hash, skiplist, sql, twoskip

userdeny_db_path: <none>

The absolute path to the userdeny db file. If not specified, will be confdir/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: 0

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.

virtdomains: off

Enable virtual domain support. If enabled, the user’s domain will be determined by splitting a fully qualified userid at the last ‘@’ or ‘%’ symbol. If the userid is unqualified, and the virtdomains option is set to “on”, then the domain will be determined by doing a reverse lookup on the IP address of the incoming network interface, otherwise the user is assumed to be in the default domain (if set). Allowed values: off, userid, on

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.

Allowed values: flat, berkeley, berkeley-hash, skiplist, twoskip

zoneinfo_db_path:` <none>

The absolute path to the zoneinfo db file. If not specified, will be confdir/zoneinfo.db