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IMAPD.CONF(5)
NAME
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.
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.
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 canoicalization (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 (eg. 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 (eg.
sasldb), and that the system can provide enough entropy (eg. 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: 1
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 can not 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, skiplist
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.
client_timeout: 10
Number of seconds to wait before returning a timeout failure when
performing a client connection (e.g. in a murder enviornment)
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: default
The partition name used by default for new mailboxes.
deleteright: c
The right that a user needs to delete a mailbox.
duplicate_db: berkeley-nosync
The cyrusdb backend to use for the duplicate delivery suppression and
sieve.
Allowed values: berkeley, berkeley-nosync, skiplist
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.
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 enviornments). This is separate from (and overridden by)
the ability to use the <host shortname>_mechs option to set prefered
mechanisms for a specific host
fulldirhash: 0
If enabled, uses an improved directory hashing scheme which hashes the
entire username instead of using just the first letter. This changes
hash algorithm used for quota and user directories and if
hashimapspool is enabled, the entire mail spool.
Note that this option can NOT 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.
hostname_mechs: <none>
Force a particuar 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
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 the mailbox for changes while
running the IDLE command. This option is used when idled can not be
contacted or when polling is used exclusively. The minimum value is
1. A value of 0 will disable polling (and disable IDLE if polling is
the only method available).
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: lca
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.
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_filter for
more options.
ldap_member_method: attribute
Specify a group method. The "attribute" method retrieves groups from
a multi-valued attributed specified in ldap_member_attribute. The
"filter" method uses a filter, 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>
Depricated. Use ldap_id
ldap_sasl_authz: <none>
Depricated. Use ldap_authz
ldap_sasl_mech: <none>
Depricated. Use ldap_mech
ldap_sasl_password: <none>
Depricated. User ldap_password
ldap_sasl_realm: <none>
Depricated. Use ldap_realm
ldap_scope: sub
Specify search scope.
Allowed values: sub, one, base
ldap_servers: ldap://localhost/
Depricated. 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 automatiacally set to
3.
lmtp_downcase_rcpt: 0
If enabled, lmtpd will convert the recipient address to lowercase (up
to a '+' character, if present).
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.
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).
loginrealms: <empty string>
The list of remote realms whose users may authenticate using cross-
realm authentication identifiers. Seperate 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.
mailnotifier: <none>
Notifyd(8) method to use for "MAIL" notifications. If not set, "MAIL"
notifications are disabled.
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).
mboxlist_db: skiplist
The cyrusdb backend to use for the mailbox list.
Allowed values: flat, berkeley, skiplist
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 immedately issued a BYE
response.
mupdate_authname: <none>
The SASL username (Authentication Name) to use when authenticating to
the mupdate server (if needed).
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_workers_start: 5
The number of mupdate worker threads to start
mupdate_workers_minspare: 2
The minimum number of idle mupdate worker threads
mupdate_workers_maxspare: 10
The maximum number of idle mupdate worker threads
mupdate_workers_max: 50
The maximum number of mupdate worker threads (overall)
mupdate_username: <empty string>
The SASL username (Authorization Name) to use when authenticating to
the mupdate server
netscapeurl: http://asg.web.cmu.edu/cyrus/imapd/netscape-admin.html
If enabled at compile time, this specifies a URL to reply when
Netscape asks the server where the mail administration HTTP server is.
The default is a site at CMU with a hopefully informative message;
administrators should set this to a local resource with some
information of greater use.
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 a To: header to each incoming
usenet article. This To: header will contain email delivery addresses
corresponding to each newsgroup in the Newsgroups: header. By
default, a To: header is not added to usenet articles.
newsprefix: <none>
Prefix to be prepended to newsgroup names to make the corresponding
IMAP mailbox names.
notifysocket: {configdirectory}/socket/notify
Unix domain socket that the new mail notification daemon listens on.
partition-name: <none>
The pathname of the partition name. At least one field, for the
partition named in the defaultpartition option, is required. 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.)
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.
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' and
'd' for the owner of the mailbox. The 'r' right allows the user to
open the mailbox and list/retrieve messages. The 'd' right allows the
user to delete messages.
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.
proxy_authname: proxy
The authentication name to use when authenticating to a backend server
in the Cyrus Murder.
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.
proxyservers: <none>
A list of users and groups that are allowed to proxy for other users,
seperated by spaces. Any user listed in this will be allowed to login
for any other user: use with caution.
ptloader_sock: <none>
Unix domain socket that ptloader listens on. (defaults to
configdir/ptclient/ptsock)
ptscache_db: berkeley
The cyrusdb backend to use for the pts cache.
Allowed values: berkeley, skiplist
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)
quota_db: quotalegacy
The cyrusdb backend to use for quotas.
Allowed values: flat, berkeley, skiplist, quotalegacy
quotawarn: 90
The percent of quota utilization over which the server generates
warnings.
quotawarnkb: 0
The maximum amount of free space (in kB) in 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. Otherwise, 8-bit characters are changed to `X'. (A proper
soultion to non-ASCII characters in headers is offered by RFC 2047 and
its predecessors.)
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 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 preceeding 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, skiplist
sendmail: /usr/lib/sendmail
The pathname of the sendmail executable. Sieve invokes sendmail for
sending rejections, redirects and vacation responses.
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.
sharedprefix: Shared Folders
If using the alternate IMAP namespace, the prefix for the shared
namespace. The hierarchy delimiter will be automatically appended.
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).
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, 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_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 permanant failures
(causing the mail to bounce immediately).
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.
subscription_db: flat
The cyrusdb backend to use for the subscriptions list.
Allowed values: flat, berkeley, skiplist
syslog_prefix: <none>
String to be appended to the process name in syslog entries.
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) certificates.
tls_ca_path: <none>
Path to directory with certificates of CAs. This directory must have
filenames with the hashed value of the certificate (see openssl(XXX)).
tlscache_db: berkeley-nosync
The cyrusdb backend to use for the TLS cache.
Allowed values: berkeley, berkeley-nosync, skiplist
tls_cert_file: <none>
File containing the certificate presented for server authentication
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 certificate.
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.
username_tolower: 1
Convert usernames to all lowercase before login/authenticate. 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. 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 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
SEE ALSO
imapd(8), pop3d(8), nntpd(8), lmtpd(8), timsieved(8), idled(8), notifyd(8),
deliver(8), master(8), ciphers(1)
Allowed values: off, userid, on
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