NAME
DESCRIPTION
FIELD DESCRIPTIONS
sasl_option:
SEE ALSO

## 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 options, the values ``yes'', ``on'', ``t'', and ``1'' turn the option on, the values ``no'', ``off'', ``f'', 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>''.

configdirectory: <no default>
The pathname of the IMAP configuration directory. This field is required.

defaultpartition: default
The partition name used by default for new mailboxes.

partition-name: <no default>
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.

unixhierarchysep: no
Use the UNIX separator character '/' for delimiting levels of mailbox hierarchy. The default is to use the net-
news separator character '.'.

altnamespace: no
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.

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

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

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

servername: <result returned by gethostname(2)>
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.

allowallsubscribe: no
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: no
Permit logins by the user "anonymous" using any password. Also allows use of the SASL ANONYMOUS
mechanism.

allowplaintext: yes
Allow the use of the SASL PLAIN mechanism.

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

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

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: yes
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.

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

popminpoll: 0
Set the minimum amount of time the server forces users to wait between successive POP logins, in minutes.
The default is 0.

popexpiretime: 0
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 sup-
port). "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 pol-
icy, it needs to change this parameter accordingly.

admins: <none>
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.

imap_admins: <none>
A list of users that have imap admin rights, in addition to those listed in the admins: entry.

lmtp_admins: <none>
A list of users that have LMTP admin rights, in addition to those listed in the admins: entry. Only lmtp admins
can deliver to lmtpd through TCP/IP sockets.

mupdate_admins: <none>
A list of users that have mupdate admin rights, in addition to those listed in the admins: entry. Only mupdate
admins can connect to the mupdate master.

sieve_admins: <none>
A list of users that have sieve admin rights, in addition to those listed in the admins: entry.

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.

imap_proxyservers <none>
A list of users and groups that are allowed to proxy for other users for imap, seperated by spaces. Any user
listed in this will be allowed to login in imapd or pop3d for any other user: use with caution.

sieve_proxyservers <none>
A list of users and groups that are allowed to proxy for other users for sieve, seperated by spaces. Any user
listed in this will be allowed to login in timsieved for any other user: use with caution.

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

newsspool: <no default>
The pathname of the news spool directory. Only used if the partition-news configuration option is set.

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

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.

logtimestamps: no
Include notations in the protocol telemetry logs indicating the number of seconds since the last command or
response.

plaintextloginpause: 0
Number of seconds to pause after a successful plaintext login. For systems that support strong authentica-
tion, this permits users to perceive a cost of using plaintext passwords. (This does not effect the use of
PLAIN in SASL authentications.)

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

loginrealms: <none>
The list of remote realms whose users may log in using cross-realm authentications. Seperate each realm
name by a space. (A cross-realm identity is considered any identity returned by SASL with an "@" in it.)

loginuseacl: no
If enabled, any authentication identity which has a rights on a user's INBOX may log in as that user.

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

duplicatesuppression: yes
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.

reject8bit: no
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 prede-
cessors.)

maxmessagesize: <unlimited>
Maximum incoming LMTP message size. If set, lmtpd will reject messages larger than maxmessagesize
bytes. The default is to allow messages of any size.

lmtp_overquota_perm_failure: no
If enabled, lmtpd returns a permanent failure code when a user's mailbox is over quota. By default, the fail-
ure is temporary.

lmtp_allowplaintext: <setting of allowplaintext>
Allow the use of the SASL PLAIN mechanism for LMTP.

postuser: <none>
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.

netscapeurl: <no default>
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 with some useful informa-
tion for end users. If not set, no URL is advertised.

mailnotifier: <no default>
Notifyd(8) method to use for "MAIL" notifications. If not set, "MAIL" notifications are disabled.

sievenotifier: <no default>
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: false
If enabled, lmtpd will look for Sieve scripts in user's home directories: ~user/.sieve.

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

sendmail: /usr/lib/sendmail
The pathname of the sendmail executable. Sieve uses sendmail for sending rejections, redirects and vaca-
tion responses.

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

hashimapspool: false
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.

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).

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_pwcheck_method: auxprop
The mechanism used by the server to verify plaintext passwords. Possible values also include "saslauthd"
and "pwcheck".

sasl_auto_transition: no
If enabled, the SASL library will automatically create authentication secrets when given a plaintext pass-
word. See the SASL documentation.

## sasl_option:

Any other SASL option can be set by preceeding it with "sasl_". This file overrides the SASL configuration
file.

tls_cert_file: <none>
File containing the global certificate used for ALL services (imap, pop3, lmtp, sieve).

tls_key_file: <none>
File containing the private key belonging to the global server certificate.

tls_require_cert: 0
Require a client certificate for ALL services (imap, pop3, lmtp, sieve).

tls_imap_cert_file: <none>
File containing the certificate used for imap ONLY. If not specified, the global certificate is used. A value of
"disabled" will disable SSL/TLS for imap.

tls_imap_key_file: <none>
File containing the private key belonging to the imap-specific server certificate. If not specified, the global
private key is used. A value of "disabled" will disable SSL/TLS for imap.

tls_imap_require_cert: 0
Require a client certificate for imap ONLY.

tls_pop3_cert_file: <none>
File containing the certificate used for pop3 ONLY. If not specified, the global certificate is used. A value of
"disabled" will disable SSL/TLS for pop3.

tls_pop3_key_file: <none>
File containing the private key belonging to the pop3-specific server certificate. If not specified, the global
private key is used. A value of "disabled" will disable SSL/TLS for pop3.

tls_pop3_require_cert: 0
Require a client certificate for pop3 ONLY.

tls_lmtp_cert_file: <none>
File containing the certificate used for lmtp ONLY. If not specified, the global certificate is used. A value of
"disabled" will disable TLS for lmtp.

tls_lmtp_key_file: <none>
File containing the private key belonging to the lmtp-specific server certificate. If not specified, the global pri-
vate key is used. A value of "disabled" will disable TLS for lmtp.

tls_lmtp_require_cert: 0
Require a client certificate for lmtp ONLY.

tls_sieve_cert_file: <none>
File containing the certificate used for sieve ONLY. If not specified, the global certificate is used. A value of
"disabled" will disable TLS for sieve.

tls_sieve_key_file: <none>
File containing the private key belonging to the sieve-specific server certificate. If not specified, the global
private key is used. A value of "disabled" will disable TLS for sieve.

tls_sieve_require_cert: 0
Require a client certificate for sieve ONLY.

tls_ca_file: <none>
File containing one or more Certificate Authority (CA) certificates.

tls_ca_path: <none>
Path to directory with certificates of CAs.

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

deleteright: c
The right that a user needs to delete a mailbox.

lmtpsocket: /var/imap/socket/lmtp
Unix domain socket that lmtpd listens on, used by deliver(8).

idlesocket: /var/imap/socket/idle
Unix domain socket that idled listens on.

notifysocket: /var/imap/socket/notify
Unix domain socket that the new mail notification daemon listens on.

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

proxyd_allow_status_referral: false
Set to true to allow proxyd to issue referrals to clients that support it when answering the STATUS com-
mand. 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.

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

mupdate_port: <none>
The port of the mupdate server for the Cyrus Murder

mupdate_username: <none>
The SASL username (Authorization Name) to use when authenticating to the mupdate server.

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

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

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

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

## SEE ALSO

imapd(8), pop3d(8), lmtpd(8), timsieved(8), idled(8), notifyd(8), deliver(8), master(8), ciphers(1)