IMAPD.CONF(5)IMAPD.CONF(5)
*
NAMEimapd.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 ``\'' charac‐
ter(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>''.
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. Admin‐
istrative 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 administra‐
tors 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 typi‐
cally used on backend servers in a Murder so that users can sub‐
scribe 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 sup‐
port, 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
Allow the use of cleartext passwords on the wire.
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: skiplist
The cyrusdb backend to use for mailbox annotations.
Allowed values: berkeley, berkeley-hash, skiplist
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_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 the draft standard, typically of
the form /vendor/acme/blurdybloop
scope
specifies whether the annotation is for the server or a mailbox
attrib-type
specifies the attribute data type which is one of: string, bool‐
ean, int, uint, or content-type
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 anno‐
tation. Possible attribute names are (where the suffixless foo
permits both foo.priv and foo.shared): alue, value.shared,
value.priv, size, size.shared, size.priv, modifiedsince, modi‐
fiedsince.shared, modifiedsince.priv, content-type, content-
type.shared, content-type.priv
acl is the extra ACL requirements for setting annotations. This is the
standard IMAP ACL permission bit string format. Particularly use‐
ful is the a right to require admin privileges. Note that some ACL
requirements (read and write on the mailbox) are hard-wired in the
server
Blank lines and lines beginning with ``#'' are ignored.
auditlog: 0
Should cyrus output log entries for every action taken on a mes‐
sage 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
autocreatequota: 0
If nonzero, normal users may create their own IMAP accounts by
creating the mailbox INBOX. The user's quota is set to the value
if it is positive, otherwise the user has unlimited quota.
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.
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.
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.
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
If "delete_mode" set to be "delayed", the prefix for the deleted
mailboxes hierarchy. The hierarchy delimiter will be automati‐
cally appended.
delete_mode: immediate
The manner in which mailboxes are deleted. "immediate" mode is the
default behavior in which mailboxes are removed immediately. In
"delayed" mode, mailboxes are renamed to a special hiearchy
defined by the "deletedprefix" option to be removed later by
cyr_expire.
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 user 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.
duplicate_db: skiplist
The cyrusdb backend to use for the duplicate delivery suppression
and sieve.
Allowed values: berkeley, berkeley-nosync, berkeley-hash, berke‐
ley-hash-nosync, skiplist, sql
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.
expunge_mode: default
The mode in which messages (and their corresponding cache entries)
are expunged. "default" mode is the default 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, 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
expunge_days: 7
Number of days to retain expunged messages before cleaning up
their index records. The default is 7. This is necessary for
QRESYNC to work correctly. If combined with delayed expunge
(above) you will also be able to unexpunge messages during this
time.
failedloginpause: 3
Number of seconds to pause after a failed login.
flushseenstate: 0
If enabled, changes to the seen state will be flushed to disk
immediately, otherwise changes will be cached and flushed when the
mailbox is closed. This option may be used to fix the problem of
previously read messages being marked as unread in Microsoft Out‐
look, at the expense of a loss of performance/scalability.
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 opera‐
tions (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 util‐
ity.
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 authen‐
ticating 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 host‐
name (where hostname is the short hostname of the server) - Cyrus
Murder
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 config‐
uration. 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/recon‐
struct. "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
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_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_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_fil‐
ter 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_fil‐
ter, 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 StartTLS extended operation. Do not use ldaps: ldap_uri when
this option is 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_tls_cacert_dir: <none>
Path to directory with CA (Certificate Authority) certificates.
ldap_tls_cacert_file: <none>
File containing CA (Certificate Authority) certificate(s).
ldap_tls_cert: <none>
File containing the client certificate.
ldap_tls_check_peer: 0
Require and verify server certificate. If this option is yes, you
must specify ldap_tls_cacert_file or ldap_tls_cacert_dir.
ldap_tls_ciphers: <none>
List of SSL/TLS ciphers to allow. The format of the string is
described in ciphers(1).
ldap_tls_key: <none>
File containing the private client key.
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: 0
If enabled, lmtpd will convert the recipient addresses to lower‐
case (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 unrespon‐
sive 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
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 mal‐
formed messages causing giant cache records
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: skiplist
The cyrusdb backend to use for mailbox keys.
Allowed values: berkeley, skiplist
mboxlist_db: skiplist
The cyrusdb backend to use for the mailbox list.
Allowed values: flat, berkeley, berkeley-hash, skiplist
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 meta‐
partition rather than in the mailbox directory on a spool parti‐
tion.
Allowed values: header, index, cache, expunge, squat
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 meta‐
partition_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 mail‐
boxes.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 mup‐
date 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 corre‐
sponding 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 trans‐
lated 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 authenti‐
cation 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 feed‐
ing 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 (usu‐
ally 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 correspond‐
ing 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 correspond‐
ing 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.
normalizeuid: 0
Lowercase uid and strip leading and trailing blanks. It is recom‐
mended to set this to yes, especially if OpenLDAP is used as
authentication source.
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 path‐
name 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.
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 com‐
mand, defined in the POP3 Extension Mechanism, which some clients
may support). "NEVER", the default, may be specified with a nega‐
tive number. The Cyrus POP3 server never deletes mail, no matter
what the value of this parameter is. However, if a site imple‐
ments 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+sub‐
folder syntax as the authentication/authorization id.
poppollpadding: 1
Create a softer minimum poll restriction. Allows poppollpadding
connections before the minpoll restriction is triggered. Addi‐
tionally, one padding entry is recovered every popminpoll minutes.
This allows for the occasional polling rate faster than popmin‐
poll, (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', 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 pro‐
duced 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 stan‐
dard 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 con‐
figdir/ptclient/ptsock)
ptscache_db: skiplist
The cyrusdb backend to use for the pts cache.
Allowed values: berkeley, berkeley-hash, skiplist
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 canonical‐
ization, 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 canonical‐
ization, 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, quo‐
talegacy
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, than 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.
sasl_auto_transition: 0
If enabled, the SASL library will automatically create authentica‐
tion secrets when given a plaintext password. See the SASL docu‐
mentation.
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".
seenstate_db: skiplist
The cyrusdb backend to use for the seen state.
Allowed values: flat, berkeley, berkeley-hash, skiplist
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 find‐
ing server with the most available free space for proxying CREATE.
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.
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). Other‐
wise, timsieved will proxy traffic to the remote server.
sieve_extensions: fileinto reject vacation imapflags notify envelope
relational regex subaddress copy
Space-separated list of Sieve extensions allowed to be used in
sieve scripts, enforced at submission by timsieved(8). Any previ‐
ously 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, imapflags, notify,
include, envelope, body, relational, regex, subaddress, copy
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 suc‐
cessful SASL authentication, per draft-martin-managesieve-12.txt .
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.
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).
specialusealways: 0
If enabled, this option causes LIST and LSUB output to always
include the XLIST "special-use" flags. See "xlist-*'"
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
suppress_capabilities: <none>
Suppress the named capabilities from any capability response. Use
the exact case as it appears in the response, e.g. "sup‐
press_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: skiplist
The cyrusdb backend to use for the imap status cache.
Allowed values: berkeley, berkeley-nosync, berkeley-hash, berke‐
ley-hash-nosync, skiplist
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_compress: 0
Enable compression on replication traffic. 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 repli‐
cation 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 replicat‐
ing to every other machine.
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
syslog_prefix: <none>
String to be prepended to the process name in syslog entries.
tcp_keepalive: 0
Enable keepalive on TCP connections
tcp_keepalive_cnt: 0
Number of TCP keepalive probes to send before declaring the con‐
nection 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.
tls_ca_file: <none>
File containing one or more Certificate Authority (CA) certifi‐
cates.
tls_ca_path: <none>
Path to directory with certificates of CAs. This directory must
have filenames with the hashed value of the certificates (see
openssl(XXX)).
tlscache_db: skiplist
The cyrusdb backend to use for the TLS cache.
Allowed values: berkeley, berkeley-nosync, berkeley-hash, berke‐
ley-hash-nosync, skiplist, sql
tlscache_db_path: <none>
The absolute path to the tlscache db file. If not specified, will
be confdir/tls_sessions.db
tls_cert_file: <none>
File containing the certificate presented for server authentica‐
tion during STARTTLS. A value of "disabled" will disable SSL/TLS.
tls_cipher_list: DEFAULT
The list of SSL/TLS ciphers to allow. The format of the string is
described in ciphers(1).
tls_key_file: <none>
File containing the private key belonging to the server certifi‐
cate. A value of "disabled" will disable SSL/TLS.
tls_require_cert: 0
Require a client certificate for ALL services (imap, pop3, lmtp,
sieve).
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.
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
userdeny_db_path: <none>
The absolute path to the userdeny db file. If not specified, will
be confdir/user_deny.db
user_folder_limit: 0
Limit the number of folders a user can create in their INBOX. Set
to 0 (default) for no limit. Only affects folders in user.
username_tolower: 1
Convert usernames to all lowercase before login/authentication.
This is useful with authentication backends which ignore case dur‐
ing 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 get‐
grent() calls very slow)
unixhierarchysep: 0
Use the UNIX separator character '/' for delimiting levels of
mailbox hierarchy. The default is to use the netnews separator
character '.'.
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 virtdo‐
mains 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
xlist-*: <none>
Cyrus 2.4 ONLY - enable special use flags. The valid names can be
taken from GMail's XLIST documents or RFC 6154. Attribute name in
the configuration key should be defined in lowercase. The
attribute value is case sensitive, may contain whitespace and must
be valid UTF7-IMAP string. It must exactly match the name of the
subfolder of a user's INBOX.
Example: xlist-drafts: My Drafts
Every user on your server with a 'INBOX.My Drafts' folder will get
the special use flag " versions of Cyrus have a much more flexible
RFC 6154 compatible system.
SEE ALSOimapd(8), pop3d(8), nntpd(8), lmtpd(8), timsieved(8), idled(8), noti‐
fyd(8), deliver(8), cyrus-master(8), ciphers(1)CMU Project Cyrus IMAPD.CONF(5)
