1 ## Dovecot configuration file
3 # If you're in a hurry, see http://wiki.dovecot.org/QuickConfiguration
5 # "dovecot -n" command gives a clean output of the changed settings. Use it
6 # instead of copy&pasting this file when posting to the Dovecot mailing list.
8 # '#' character and everything after it is treated as comments. Extra spaces
9 # and tabs are ignored. If you want to use either of these explicitly, put the
10 # value inside quotes, eg.: key = "# char and trailing whitespace "
12 # Default values are shown for each setting, it's not required to uncomment
13 # those. These are exceptions to this though: No sections (e.g. namespace {})
14 # or plugin settings are added by default, they're listed only as examples.
15 # Paths are also just examples with the real defaults being based on configure
16 # options. The paths listed here are for configure --prefix=/usr
17 # --sysconfdir=/etc --localstatedir=/var --with-ssldir=/etc/ssl
19 # Base directory where to store runtime data.
20 #base_dir = /var/run/dovecot
22 # Protocols we want to be serving: imap imaps pop3 pop3s managesieve
23 # If you only want to use dovecot-auth, you can set this to "none".
24 #protocols = imap imaps
25 protocols = imap imaps
27 # A space separated list of IP or host addresses where to listen in for
28 # connections. "*" listens in all IPv4 interfaces. "[::]" listens in all IPv6
29 # interfaces. Use "*, [::]" for listening both IPv4 and IPv6.
31 # If you want to specify ports for each service, you will need to configure
32 # these settings inside the protocol imap/pop3/managesieve { ... } section,
33 # so you can specify different ports for IMAP/POP3/MANAGESIEVE. For example:
36 # ssl_listen = *:10943
43 # protocol managesieve {
49 # Disable LOGIN command and all other plaintext authentications unless
50 # SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
51 # matches the local IP (ie. you're connecting from the same computer), the
52 # connection is considered secure and plaintext authentication is allowed.
53 #disable_plaintext_auth = yes
55 # Should all IMAP and POP3 processes be killed when Dovecot master process
56 # shuts down. Setting this to "no" means that Dovecot can be upgraded without
57 # forcing existing client connections to close (although that could also be
58 # a problem if the upgrade is eg. because of a security fix). This however
59 # means that after master process has died, the client processes can't write
60 # to log files anymore.
61 #shutdown_clients = yes
67 # Log file to use for error messages, instead of sending them to syslog.
68 # /dev/stderr can be used to log into stderr.
71 # Log file to use for informational and debug messages.
72 # Default is the same as log_path.
75 # Prefix for each line written to log file. % codes are in strftime(3)
77 #log_timestamp = "%b %d %H:%M:%S "
78 log_timestamp = "%Y-%m-%d %H:%M:%S "
80 # Syslog facility to use if you're logging to syslog. Usually if you don't
81 # want to use "mail", you'll use local0..local7. Also other standard
82 # facilities are supported.
83 #syslog_facility = mail
89 # IP or host address where to listen in for SSL connections. Remember to also
90 # add imaps and/or pop3s to protocols setting. Defaults to same as "listen"
91 # setting if not specified.
94 # SSL/TLS support: yes, no, required. </usr/share/doc/dovecot-common/wiki/SSL.txt>
97 # PEM encoded X.509 SSL/TLS certificate and private key. They're opened before
98 # dropping root privileges, so keep the key file unreadable by anyone but
100 ssl_cert_file = /etc/ssl/certs/olinda.mit.edu.dovecot.crt
101 ssl_key_file = /etc/ssl/private/olinda.mit.edu.dovecot.key
103 # If key file is password protected, give the password here. Alternatively
104 # give it when starting dovecot with -p parameter. Since this file is often
105 # world-readable, you may want to place this setting instead to a different
106 # root owned 0600 file by using !include_try <path>.
109 # File containing trusted SSL certificate authorities. Set this only if you
110 # intend to use ssl_verify_client_cert=yes. The CAfile should contain the
111 # CA-certificate(s) followed by the matching CRL(s).
114 # Request client to send a certificate. If you also want to require it, set
115 # ssl_require_client_cert=yes in auth section.
116 #ssl_verify_client_cert = no
118 # Which field from certificate to use for username. commonName and
119 # x500UniqueIdentifier are the usual choices. You'll also need to set
120 # ssl_username_from_cert=yes.
121 #ssl_cert_username_field = commonName
123 # How often to regenerate the SSL parameters file. Generation is quite CPU
124 # intensive operation. The value is in hours, 0 disables regeneration
126 #ssl_parameters_regenerate = 168
129 #ssl_cipher_list = ALL:!LOW:!SSLv2
131 # Show protocol level SSL errors.
138 # </usr/share/doc/dovecot-common/wiki/LoginProcess.txt>
140 # Directory where authentication process places authentication UNIX sockets
141 # which login needs to be able to connect to. The sockets are created when
142 # running as root, so you don't have to worry about permissions. Note that
143 # everything in this directory is deleted when Dovecot is started.
144 #login_dir = /var/run/dovecot/login
146 # chroot login process to the login_dir. Only reason not to do this is if you
147 # wish to run the whole Dovecot without roots. </usr/share/doc/dovecot-common/wiki/Rootless.txt>
150 # User to use for the login process. Create a completely new user for this,
151 # and don't use it anywhere else. The user must also belong to a group where
152 # only it has access, it's used to control access for authentication process.
153 # Note that this user is NOT used to access mails. </usr/share/doc/dovecot-common/wiki/UserIds.txt>
154 #login_user = dovecot
156 # Set max. process size in megabytes. If you don't use
157 # login_process_per_connection you might need to grow this.
158 #login_process_size = 64
160 # Should each login be processed in it's own process (yes), or should one
161 # login process be allowed to process multiple connections (no)? Yes is more
162 # secure, espcially with SSL/TLS enabled. No is faster since there's no need
163 # to create processes all the time.
164 #login_process_per_connection = yes
166 # Number of login processes to keep for listening new connections.
167 #login_processes_count = 3
169 # Maximum number of login processes to create. The listening process count
170 # usually stays at login_processes_count, but when multiple users start logging
171 # in at the same time more extra processes are created. To prevent fork-bombing
172 # we check only once in a second if new processes should be created - if all
173 # of them are used at the time, we double their amount until the limit set by
174 # this setting is reached.
175 #login_max_processes_count = 128
177 # Maximum number of connections allowed per each login process. This setting
178 # is used only if login_process_per_connection=no. Once the limit is reached,
179 # the process notifies master so that it can create a new login process.
180 #login_max_connections = 256
182 # Greeting message for clients.
183 #login_greeting = Dovecot ready.
185 # Space separated list of trusted network ranges. Connections from these
186 # IPs are allowed to override their IP addresses and ports (for logging and
187 # for authentication checks). disable_plaintext_auth is also ignored for
188 # these networks. Typically you'd specify your IMAP proxy servers here.
189 #login_trusted_networks =
191 # Space-separated list of elements we want to log. The elements which have
192 # a non-empty variable value are joined together to form a comma-separated
194 #login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c
196 # Login log format. %$ contains login_log_format_elements string, %s contains
197 # the data we want to log.
198 #login_log_format = %$: %s
201 ## Mailbox locations and namespaces
204 # Location for users' mailboxes. This is the same as the old default_mail_env
205 # setting. The default is empty, which means that Dovecot tries to find the
206 # mailboxes automatically. This won't work if the user doesn't have any mail
207 # yet, so you should explicitly tell Dovecot the full location.
209 # If you're using mbox, giving a path to the INBOX file (eg. /var/mail/%u)
210 # isn't enough. You'll also need to tell Dovecot where the other mailboxes are
211 # kept. This is called the "root mail directory", and it must be the first
212 # path given in the mail_location setting.
214 # There are a few special variables you can use, eg.:
217 # %n - user part in user@domain, same as %u if there's no domain
218 # %d - domain part in user@domain, empty if there's no domain
219 # %h - home directory
221 # See </usr/share/doc/dovecot-common/wiki/Variables.txt> for full list.
224 # mail_location = maildir:~/Maildir
225 # mail_location = mbox:~/mail:INBOX=/var/mail/%u
226 # mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
228 # </usr/share/doc/dovecot-common/wiki/MailLocation.txt>
231 mail_location = maildir:~/.maildir
233 # If you need to set multiple mailbox locations or want to change default
234 # namespace settings, you can do it by defining namespace sections.
236 # You can have private, shared and public namespaces. Private namespaces
237 # are for user's personal mails. Shared namespaces are for accessing other
238 # users' mailboxes that have been shared. Public namespaces are for shared
239 # mailboxes that are managed by sysadmin. If you create any shared or public
240 # namespaces you'll typically want to enable ACL plugin also, otherwise all
241 # users can access all the shared mailboxes, assuming they have permissions
242 # on filesystem level to do so.
244 # REMEMBER: If you add any namespaces, the default namespace must be added
245 # explicitly, ie. mail_location does nothing unless you have a namespace
246 # without a location setting. Default namespace is simply done by having a
247 # namespace with empty prefix.
249 # Hierarchy separator to use. You should use the same separator for all
250 # namespaces or some clients get confused. '/' is usually a good one.
251 # The default however depends on the underlying mail storage format.
254 # Prefix required to access this namespace. This needs to be different for
255 # all namespaces. For example "Public/".
258 # Physical location of the mailbox. This is in same format as
259 # mail_location, which is also the default for it.
262 # There can be only one INBOX, and this setting defines which namespace
266 # If namespace is hidden, it's not advertised to clients via NAMESPACE
267 # extension. You'll most likely also want to set list=no. This is mostly
268 # useful when converting from another server with different namespaces which
269 # you want to deprecate but still keep working. For example you can create
270 # hidden namespaces with prefixes "~/mail/", "~%u/mail/" and "mail/".
273 # Show the mailboxes under this namespace with LIST command. This makes the
274 # namespace visible for clients that don't support NAMESPACE extension.
275 # "children" value lists child mailboxes, but hides the namespace prefix.
278 # Namespace handles its own subscriptions. If set to "no", the parent
279 # namespace handles them (empty prefix should always have this as "yes")
283 # Example shared namespace configuration
287 # Mailboxes are visible under "shared/user@domain/"
288 # %%n, %%d and %%u are expanded to the destination user.
289 #prefix = shared/%%u/
291 # Mail location for other users' mailboxes. Note that %variables and ~/
292 # expands to the logged in user's data. %%n, %%d, %%u and %%h expand to the
293 # destination user's data.
294 #location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
296 # Use the default namespace for saving subscriptions.
299 # List the shared/ namespace only if there are visible shared mailboxes.
303 # System user and group used to access mails. If you use multiple, userdb
304 # can override these by returning uid or gid fields. You can use either numbers
305 # or names. </usr/share/doc/dovecot-common/wiki/UserIds.txt>
309 # Group to enable temporarily for privileged operations. Currently this is
310 # used only with INBOX when either its initial creation or dotlocking fails.
311 # Typically this is set to "mail" to give access to /var/mail.
312 #mail_privileged_group =
313 mail_privileged_group = mail
315 # Grant access to these supplementary groups for mail processes. Typically
316 # these are used to set up access to shared mailboxes. Note that it may be
317 # dangerous to set these if users can create symlinks (e.g. if "mail" group is
318 # set here, ln -s /var/mail ~/mail/var could allow a user to delete others'
319 # mailboxes, or ln -s /secret/shared/box ~/mail/mybox would allow reading it).
320 #mail_access_groups =
322 # Allow full filesystem access to clients. There's no access checks other than
323 # what the operating system does for the active UID/GID. It works with both
324 # maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/
326 #mail_full_filesystem_access = no
332 # Enable mail process debugging. This can help you figure out why Dovecot
333 # isn't finding your mails.
336 # Log prefix for mail processes. See </usr/share/doc/dovecot-common/wiki/Variables.txt>
337 # for list of possible variables you can use.
338 #mail_log_prefix = "%Us(%u): "
340 # Max. number of lines a mail process is allowed to log per second before it's
341 # throttled. 0 means unlimited. Typically there's no need to change this
342 # unless you're using mail_log plugin, which may log a lot. This setting is
343 # ignored while mail_debug=yes to avoid pointless throttling.
344 #mail_log_max_lines_per_sec = 10
346 # Don't use mmap() at all. This is required if you store indexes to shared
347 # filesystems (NFS or clustered filesystem).
350 # Rely on O_EXCL to work when creating dotlock files. NFS supports O_EXCL
351 # since version 3, so this should be safe to use nowadays by default.
352 #dotlock_use_excl = yes
354 # Don't use fsync() or fdatasync() calls. This makes the performance better
355 # at the cost of potential data loss if the server (or the file server)
359 # Mail storage exists in NFS. Set this to yes to make Dovecot flush NFS caches
360 # whenever needed. If you're using only a single mail server this isn't needed.
361 #mail_nfs_storage = no
362 # Mail index files also exist in NFS. Setting this to yes requires
363 # mmap_disable=yes and fsync_disable=no.
366 # Locking method for index files. Alternatives are fcntl, flock and dotlock.
367 # Dotlocking uses some tricks which may create more disk I/O than other locking
368 # methods. NFS users: flock doesn't work, remember to change mmap_disable.
371 # Drop all privileges before exec()ing the mail process. This is mostly
372 # meant for debugging, otherwise you don't get core dumps. It could be a small
373 # security risk if you use single UID for multiple users, as the users could
374 # ptrace() each others processes then.
375 #mail_drop_priv_before_exec = no
377 # Show more verbose process titles (in ps). Currently shows user name and
378 # IP address. Useful for seeing who are actually using the IMAP processes
379 # (eg. shared mailboxes or if same uid is used for multiple accounts).
380 #verbose_proctitle = no
382 # Valid UID range for users, defaults to 500 and above. This is mostly
383 # to make sure that users can't log in as daemons or other system users.
384 # Note that denying root logins is hardcoded to dovecot binary and can't
385 # be done even if first_valid_uid is set to 0.
386 #first_valid_uid = 500
389 # Valid GID range for users, defaults to non-root/wheel. Users having
390 # non-valid GID as primary group ID aren't allowed to log in. If user
391 # belongs to supplementary groups with non-valid GIDs, those groups are
396 # Maximum number of running mail processes. When this limit is reached,
397 # new users aren't allowed to log in.
398 #max_mail_processes = 512
400 # Set max. process size in megabytes. Most of the memory goes to mmap()ing
401 # files, so it shouldn't harm much even if this limit is set pretty high.
402 #mail_process_size = 256
404 # Maximum allowed length for mail keyword name. It's only forced when trying
405 # to create new keywords.
406 #mail_max_keyword_length = 50
408 # ':' separated list of directories under which chrooting is allowed for mail
409 # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too).
410 # This setting doesn't affect login_chroot, mail_chroot or auth chroot
411 # settings. If this setting is empty, "/./" in home dirs are ignored.
412 # WARNING: Never add directories here which local users can modify, that
413 # may lead to root exploit. Usually this should be done only if you don't
414 # allow shell access for users. </usr/share/doc/dovecot-common/wiki/Chrooting.txt>
417 # Default chroot directory for mail processes. This can be overridden for
418 # specific users in user database by giving /./ in user's home directory
419 # (eg. /home/./user chroots into /home). Note that usually there is no real
420 # need to do chrooting, Dovecot doesn't allow users to access files outside
421 # their mail directory anyway. If your home directories are prefixed with
422 # the chroot directory, append "/." to mail_chroot. </usr/share/doc/dovecot-common/wiki/Chrooting.txt>
426 ## Mailbox handling optimizations
429 # The minimum number of mails in a mailbox before updates are done to cache
430 # file. This allows optimizing Dovecot's behavior to do less disk writes at
431 # the cost of more disk reads.
432 #mail_cache_min_mail_count = 0
434 # When IDLE command is running, mailbox is checked once in a while to see if
435 # there are any new mails or other changes. This setting defines the minimum
436 # time in seconds to wait between those checks. Dovecot can also use dnotify,
437 # inotify and kqueue to find out immediately when changes occur.
438 #mailbox_idle_check_interval = 30
440 # Save mails with CR+LF instead of plain LF. This makes sending those mails
441 # take less CPU, especially with sendfile() syscall with Linux and FreeBSD.
442 # But it also creates a bit more disk I/O which may just make it slower.
443 # Also note that if other software reads the mboxes/maildirs, they may handle
444 # the extra CRs wrong and cause problems.
448 ## Maildir-specific settings
451 # By default LIST command returns all entries in maildir beginning with a dot.
452 # Enabling this option makes Dovecot return only entries which are directories.
453 # This is done by stat()ing each entry, so it causes more disk I/O.
454 # (For systems setting struct dirent->d_type, this check is free and it's
455 # done always regardless of this setting)
456 #maildir_stat_dirs = no
458 # When copying a message, do it with hard links whenever possible. This makes
459 # the performance much better, and it's unlikely to have any side effects.
460 #maildir_copy_with_hardlinks = yes
462 # When copying a message, try to preserve the base filename. Only if the
463 # destination mailbox already contains the same name (ie. the mail is being
464 # copied there twice), a new name is given. The destination filename check is
465 # done only by looking at dovecot-uidlist file, so if something outside
466 # Dovecot does similar filename preserving copies, you may run into problems.
467 # NOTE: This setting requires maildir_copy_with_hardlinks = yes to work.
468 #maildir_copy_preserve_filename = no
470 # Assume Dovecot is the only MUA accessing Maildir: Scan cur/ directory only
471 # when its mtime changes unexpectedly or when we can't find the mail otherwise.
472 #maildir_very_dirty_syncs = no
475 ## mbox-specific settings
478 # Which locking methods to use for locking mbox. There are four available:
479 # dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe
480 # solution. If you want to use /var/mail/ like directory, the users
481 # will need write access to that directory.
482 # dotlock_try: Same as dotlock, but if it fails because of permissions or
483 # because there isn't enough disk space, just skip it.
484 # fcntl : Use this if possible. Works with NFS too if lockd is used.
485 # flock : May not exist in all systems. Doesn't work with NFS.
486 # lockf : May not exist in all systems. Doesn't work with NFS.
488 # You can use multiple locking methods; if you do the order they're declared
489 # in is important to avoid deadlocks if other MTAs/MUAs are using multiple
490 # locking methods as well. Some operating systems don't allow using some of
491 # them simultaneously.
493 # The Debian value for mbox_write_locks differs from upstream Dovecot. It is
494 # changed to be compliant with Debian Policy (section 11.6) for NFS safety.
495 # Dovecot: mbox_write_locks = dotlock fcntl
496 # Debian: mbox_write_locks = fcntl dotlock
498 #mbox_read_locks = fcntl
499 #mbox_write_locks = fcntl dotlock
501 # Maximum time in seconds to wait for lock (all of them) before aborting.
502 #mbox_lock_timeout = 300
504 # If dotlock exists but the mailbox isn't modified in any way, override the
505 # lock file after this many seconds.
506 #mbox_dotlock_change_timeout = 120
508 # When mbox changes unexpectedly we have to fully read it to find out what
509 # changed. If the mbox is large this can take a long time. Since the change
510 # is usually just a newly appended mail, it'd be faster to simply read the
511 # new mails. If this setting is enabled, Dovecot does this but still safely
512 # fallbacks to re-reading the whole mbox file whenever something in mbox isn't
513 # how it's expected to be. The only real downside to this setting is that if
514 # some other MUA changes message flags, Dovecot doesn't notice it immediately.
515 # Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK
517 #mbox_dirty_syncs = yes
519 # Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,
520 # EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.
521 #mbox_very_dirty_syncs = no
523 # Delay writing mbox headers until doing a full write sync (EXPUNGE and CHECK
524 # commands and when closing the mailbox). This is especially useful for POP3
525 # where clients often delete all mails. The downside is that our changes
526 # aren't immediately visible to other MUAs.
527 #mbox_lazy_writes = yes
529 # If mbox size is smaller than this (in kilobytes), don't write index files.
530 # If an index file already exists it's still read, just not updated.
531 #mbox_min_index_size = 0
534 ## dbox-specific settings
537 # Maximum dbox file size in kilobytes until it's rotated.
538 #dbox_rotate_size = 2048
540 # Minimum dbox file size in kilobytes before it's rotated
541 # (overrides dbox_rotate_days)
542 #dbox_rotate_min_size = 16
544 # Maximum dbox file age in days until it's rotated. Day always begins from
545 # midnight, so 1 = today, 2 = yesterday, etc. 0 = check disabled.
546 #dbox_rotate_days = 0
549 ## IMAP specific settings
553 # Login executable location.
554 #login_executable = /usr/lib/dovecot/imap-login
556 # IMAP executable location. Changing this allows you to execute other
557 # binaries before the imap process is executed.
559 # This would write rawlogs into user's ~/dovecot.rawlog/, if it exists:
560 # mail_executable = /usr/lib/dovecot/rawlog /usr/lib/dovecot/imap
561 # </usr/doc/dovecot-common/wiki/Debugging.Rawlog.txt>
563 # This would attach gdb into the imap process and write backtraces into
564 # /tmp/gdbhelper.* files:
565 # mail_executable = /usr/lib/dovecot/gdbhelper /usr/lib/dovecot/imap
567 #mail_executable = /usr/lib/dovecot/imap
569 # Maximum IMAP command line length in bytes. Some clients generate very long
570 # command lines with huge mailboxes, so you may need to raise this if you get
571 # "Too long argument" or "IMAP command line too large" errors often.
572 #imap_max_line_length = 65536
574 # Maximum number of IMAP connections allowed for a user from each IP address.
575 # NOTE: The username is compared case-sensitively.
576 #mail_max_userip_connections = 10
578 # Support for dynamically loadable plugins. mail_plugins is a space separated
579 # list of plugins to load.
581 #mail_plugin_dir = /usr/lib/dovecot/modules/imap
583 # IMAP logout format string:
584 # %i - total number of bytes read from client
585 # %o - total number of bytes sent to client
586 #imap_logout_format = bytes=%i/%o
588 # Override the IMAP CAPABILITY response.
591 # How many seconds to wait between "OK Still here" notifications when
593 #imap_idle_notify_interval = 120
595 # ID field names and values to send to clients. Using * as the value makes
596 # Dovecot use the default value. The following fields have default values
597 # currently: name, version, os, os-version, support-url, support-email.
600 # ID fields sent by client to log. * means everything.
603 # Workarounds for various client bugs:
605 # Send EXISTS/RECENT new mail notifications only when replying to NOOP
606 # and CHECK commands. Some clients ignore them otherwise, for example OSX
607 # Mail (<v2.1). Outlook Express breaks more badly though, without this it
608 # may show user "Message no longer in server" errors. Note that OE6 still
609 # breaks even with this workaround if synchronization is set to
612 # Netscape 4.x breaks if message headers don't end with the empty "end of
613 # headers" line. Normally all messages have this, but setting this
614 # workaround makes sure that Netscape never breaks by adding the line if
615 # it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..]
616 # commands. Note that RFC says this shouldn't be done.
617 # tb-extra-mailbox-sep:
618 # With mbox storage a mailbox can contain either mails or submailboxes,
619 # but not both. Thunderbird separates these two by forcing server to
620 # accept '/' suffix in mailbox names in subscriptions list.
621 # The list is space-separated.
622 #imap_client_workarounds =
626 ## POP3 specific settings
630 # Login executable location.
631 #login_executable = /usr/lib/dovecot/pop3-login
633 # POP3 executable location. See IMAP's mail_executable above for examples
634 # how this could be changed.
635 #mail_executable = /usr/lib/dovecot/pop3
637 # Don't try to set mails non-recent or seen with POP3 sessions. This is
638 # mostly intended to reduce disk I/O. With maildir it doesn't move files
639 # from new/ to cur/, with mbox it doesn't write Status-header.
640 #pop3_no_flag_updates = no
642 # Support LAST command which exists in old POP3 specs, but has been removed
643 # from new ones. Some clients still wish to use this though. Enabling this
644 # makes RSET command clear all \Seen flags from messages.
645 #pop3_enable_last = no
647 # If mail has X-UIDL header, use it as the mail's UIDL.
648 #pop3_reuse_xuidl = no
650 # Keep the mailbox locked for the entire POP3 session.
651 #pop3_lock_session = no
653 # POP3 UIDL (unique mail identifier) format to use. You can use following
654 # variables, along with the variable modifiers described in
655 # </usr/share/doc/dovecot-common/wiki/Variables.txt> (e.g. %Uf for the
656 # filename in uppercase)
658 # %v - Mailbox's IMAP UIDVALIDITY
659 # %u - Mail's IMAP UID
660 # %m - MD5 sum of the mailbox headers in hex (mbox only)
661 # %f - filename (maildir only)
663 # If you want UIDL compatibility with other POP3 servers, use:
664 # UW's ipop3d : %08Xv%08Xu
665 # Courier : %f or %v-%u (both might be used simultaneosly)
666 # Cyrus (<= 2.1.3) : %u
667 # Cyrus (>= 2.1.4) : %v.%u
668 # Dovecot v0.99.x : %v.%u
671 # Note that Outlook 2003 seems to have problems with %v.%u format which was
672 # Dovecot's default, so if you're building a new server it would be a good
673 # idea to change this. %08Xu%08Xv should be pretty fail-safe.
675 pop3_uidl_format = %08Xu%08Xv
677 # Permanently save UIDLs sent to POP3 clients, so pop3_uidl_format changes
678 # won't change those UIDLs. Currently this works only with Maildir.
681 # POP3 logout format string:
682 # %i - total number of bytes read from client
683 # %o - total number of bytes sent to client
684 # %t - number of TOP commands
685 # %p - number of bytes sent to client as a result of TOP command
686 # %r - number of RETR commands
687 # %b - number of bytes sent to client as a result of RETR command
688 # %d - number of deleted messages
689 # %m - number of messages (before deletion)
690 # %s - mailbox size in bytes (before deletion)
691 #pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
693 # Maximum number of POP3 connections allowed for a user from each IP address.
694 # NOTE: The username is compared case-sensitively.
695 #mail_max_userip_connections = 3
697 # Support for dynamically loadable plugins. mail_plugins is a space separated
698 # list of plugins to load.
700 #mail_plugin_dir = /usr/lib/dovecot/modules/pop3
702 # Workarounds for various client bugs:
704 # Outlook and Outlook Express hang if mails contain NUL characters.
705 # This setting replaces them with 0x80 character.
707 # Outlook Express and Netscape Mail breaks if end of headers-line is
708 # missing. This option simply sends it if it's missing.
709 # The list is space-separated.
710 #pop3_client_workarounds =
714 ## ManageSieve specific settings
717 protocol managesieve {
718 # Login executable location.
719 #login_executable = /usr/lib/dovecot/managesieve-login
721 # ManageSieve executable location. See IMAP's mail_executable above for
722 # examples how this could be changed.
723 #mail_executable = /usr/lib/dovecot/managesieve
725 # Maximum ManageSieve command line length in bytes. This setting is
726 # directly borrowed from IMAP. But, since long command lines are very
727 # unlikely with ManageSieve, changing this will not be very useful.
728 #managesieve_max_line_length = 65536
730 # ManageSieve logout format string:
731 # %i - total number of bytes read from client
732 # %o - total number of bytes sent to client
733 #managesieve_logout_format = bytes=%i/%o
735 # To fool ManageSieve clients that are focused on timesieved you can
736 # specify the IMPLEMENTATION capability that the dovecot reports to clients
737 # (default: "dovecot").
738 #managesieve_implementation_string = Cyrus timsieved v2.2.13
740 # The ManageSieve service also uses the sieve and sieve_dir settings
741 # of the Sieve plugin. These are configured in the plugin {} section of
746 ## LDA specific settings
750 # Address to use when sending rejection mails.
751 postmaster_address = postmaster@dehnerts.com
753 # Hostname to use in various parts of sent mails, eg. in Message-Id.
754 # Default is the system's real hostname.
757 # Support for dynamically loadable plugins. mail_plugins is a space separated
758 # list of plugins to load.
760 #mail_plugin_dir = /usr/lib/dovecot/modules/lda
762 # If user is over quota, return with temporary failure instead of
764 #quota_full_tempfail = no
766 # Format to use for logging mail deliveries. You can use variables:
767 # %$ - Delivery status message (e.g. "saved to INBOX")
771 #deliver_log_format = msgid=%m: %$
772 deliver_log_format = msgid=%m, subj=%s: %$
773 log_path = /var/log/mail/dovecot-deliver.log
774 info_log_path = /var/log/mail/dovecot-deliver.info.log
776 # Binary to use for sending mails.
777 #sendmail_path = /usr/lib/sendmail
779 # Subject: header to use for rejection mails. You can use the same variables
780 # as for rejection_reason below.
781 #rejection_subject = Rejected: %s
783 # Human readable error message for rejection mails. You can use variables:
784 # %n = CRLF, %r = reason, %s = original subject, %t = recipient
785 #rejection_reason = Your message to <%t> was automatically rejected:%n%r
787 # UNIX socket path to master authentication server to find users.
788 auth_socket_path = /var/run/dovecot/auth-master
792 ## Authentication processes
795 # Executable location
796 #auth_executable = /usr/lib/dovecot/dovecot-auth
798 # Set max. process size in megabytes.
799 #auth_process_size = 256
801 # Authentication cache size in kilobytes. 0 means it's disabled.
802 # Note that bsdauth, PAM and vpopmail require cache_key to be set for caching
805 # Time to live in seconds for cached data. After this many seconds the cached
806 # record is no longer used, *except* if the main database lookup returns
807 # internal failure. We also try to handle password changes automatically: If
808 # user's previous authentication was successful, but this one wasn't, the
809 # cache isn't used. For now this works only with plaintext authentication.
810 #auth_cache_ttl = 3600
811 # TTL for negative hits (user not found, password mismatch).
812 # 0 disables caching them completely.
813 #auth_cache_negative_ttl = 3600
815 # Space separated list of realms for SASL authentication mechanisms that need
816 # them. You can leave it empty if you don't want to support multiple realms.
817 # Many clients simply use the first one listed here, so keep the default realm
821 # Default realm/domain to use if none was specified. This is used for both
822 # SASL realms and appending @domain to username in plaintext logins.
823 #auth_default_realm =
825 # List of allowed characters in username. If the user-given username contains
826 # a character not listed in here, the login automatically fails. This is just
827 # an extra check to make sure user can't exploit any potential quote escaping
828 # vulnerabilities with SQL/LDAP databases. If you want to allow all characters,
829 # set this value to empty.
830 #auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@
832 # Username character translations before it's looked up from databases. The
833 # value contains series of from -> to characters. For example "#@/@" means
834 # that '#' and '/' characters are translated to '@'.
835 #auth_username_translation =
837 # Username formatting before it's looked up from databases. You can use
838 # the standard variables here, eg. %Lu would lowercase the username, %n would
839 # drop away the domain if it was given, or "%n-AT-%d" would change the '@' into
840 # "-AT-". This translation is done after auth_username_translation changes.
841 #auth_username_format =
843 # If you want to allow master users to log in by specifying the master
844 # username within the normal username string (ie. not using SASL mechanism's
845 # support for it), you can specify the separator character here. The format
846 # is then <username><separator><master username>. UW-IMAP uses "*" as the
847 # separator, so that could be a good choice.
848 #auth_master_user_separator =
850 # Username to use for users logging in with ANONYMOUS SASL mechanism
851 #auth_anonymous_username = anonymous
853 # Log unsuccessful authentication attempts and the reasons why they failed.
856 # Even more verbose logging for debugging purposes. Shows for example SQL
860 # In case of password mismatches, log the passwords and used scheme so the
861 # problem can be debugged. Enabling this also enables auth_debug.
862 #auth_debug_passwords = no
864 # Maximum number of dovecot-auth worker processes. They're used to execute
865 # blocking passdb and userdb queries (eg. MySQL and PAM). They're
866 # automatically created and destroyed as needed.
867 #auth_worker_max_count = 30
869 # Host name to use in GSSAPI principal names. The default is to use the
870 # name returned by gethostname(). Use "$ALL" to allow all keytab entries.
871 #auth_gssapi_hostname =
873 # Kerberos keytab to use for the GSSAPI mechanism. Will use the system
874 # default (usually /etc/krb5.keytab) if not specified.
877 # Do NTLM and GSS-SPNEGO authentication using Samba's winbind daemon and
879 # </usr/share/doc/dovecot-common/wiki/Authentication.Mechanisms.Winbind.txt>
880 #auth_use_winbind = no
882 # Path for Samba's ntlm_auth helper binary.
883 #auth_winbind_helper_path = /usr/bin/ntlm_auth
885 # Number of seconds to delay before replying to failed authentications.
886 #auth_failure_delay = 2
889 # Space separated list of wanted authentication mechanisms:
890 # plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi otp skey
892 # NOTE: See also disable_plaintext_auth setting.
896 # Password database is used to verify user's password (and nothing more).
897 # You can have multiple passdbs and userdbs. This is useful if you want to
898 # allow both system users (/etc/passwd) and virtual users to login without
899 # duplicating the system users into virtual database.
901 # </usr/share/doc/dovecot-common/wiki/PasswordDatabase.txt>
903 # By adding master=yes setting inside a passdb you make the passdb a list
904 # of "master users", who can log in as anyone else. Unless you're using PAM,
905 # you probably still want the destination user to be looked up from passdb
906 # that it really exists. This can be done by adding pass=yes setting to the
907 # master passdb. </usr/share/doc/dovecot-common/wiki/Authentication.MasterUsers.txt>
909 # Users can be temporarily disabled by adding a passdb with deny=yes.
910 # If the user is found from that database, authentication will fail.
911 # The deny passdb should always be specified before others, so it gets
912 # checked first. Here's an example:
914 #passdb passwd-file {
915 # File contains a list of usernames, one per line
916 #args = /etc/dovecot/dovecot.deny
920 # PAM authentication. Preferred nowadays by most systems.
921 # Note that PAM can only be used to verify if user's password is correct,
922 # so it can't be used as userdb. If you don't want to use a separate user
923 # database (passwd usually), you can use static userdb.
924 # REMEMBER: You'll need /etc/pam.d/dovecot file created for PAM
925 # authentication to actually work. </usr/share/doc/dovecot-common/wiki/PasswordDatabase.PAM.txt>
927 # [session=yes] [setcred=yes] [failure_show_msg=yes] [max_requests=<n>]
928 # [cache_key=<key>] [<service name>]
930 # session=yes makes Dovecot open and immediately close PAM session. Some
931 # PAM plugins need this to work, such as pam_mkhomedir.
933 # setcred=yes makes Dovecot establish PAM credentials if some PAM plugins
934 # need that. They aren't ever deleted though, so this isn't enabled by
937 # max_requests specifies how many PAM lookups to do in one process before
938 # recreating the process. The default is 100, because many PAM plugins
941 # cache_key can be used to enable authentication caching for PAM
942 # (auth_cache_size also needs to be set). It isn't enabled by default
943 # because PAM modules can do all kinds of checks besides checking password,
944 # such as checking IP address. Dovecot can't know about these checks
945 # without some help. cache_key is simply a list of variables (see
946 # /usr/share/doc/dovecot-common/wiki/Variables.txt) which must match
947 # for the cached data to be used.
948 # Here are some examples:
949 # %u - Username must match. Probably sufficient for most uses.
950 # %u%r - Username and remote IP address must match.
951 # %u%s - Username and service (ie. IMAP, POP3) must match.
953 # The service name can contain variables, for example %Ls expands to
957 # args = session=yes %Ls
958 # args = cache_key=%u dovecot
962 # System users (NSS, /etc/passwd, or similiar)
963 # In many systems nowadays this uses Name Service Switch, which is
964 # configured in /etc/nsswitch.conf. </usr/share/doc/dovecot-common/wiki/AuthDatabase.Passwd.txt>
966 # [blocking=yes] - See userdb passwd for explanation
970 # Shadow passwords for system users (NSS, /etc/shadow or similiar).
971 # Deprecated by PAM nowadays.
972 # </usr/share/doc/dovecot-common/wiki/PasswordDatabase.Shadow.txt>
974 # [blocking=yes] - See userdb passwd for explanation
978 # PAM-like authentication for OpenBSD.
979 # </usr/share/doc/dovecot-common/wiki/PasswordDatabase.BSDAuth.txt>
981 # [cache_key=<key>] - See cache_key in PAM for explanation.
985 # passwd-like file with specified location
986 # </usr/share/doc/dovecot-common/wiki/AuthDatabase.PasswdFile.txt>
987 #passdb passwd-file {
988 # [scheme=<default password scheme>] [username_format=<format>]
989 # <Path for passwd-file>
993 # checkpassword executable authentication
994 # NOTE: You will probably want to use "userdb prefetch" with this.
995 # </usr/share/doc/dovecot-common/wiki/AuthDatabase.CheckPassword.txt>
996 #passdb checkpassword {
997 # Path for checkpassword binary
1001 # SQL database </usr/share/doc/dovecot-common/wiki/AuthDatabase.SQL.txt>
1003 # Path for SQL configuration file
1004 #args = /etc/dovecot/dovecot-sql.conf
1007 # LDAP database </usr/share/doc/dovecot-common/wiki/AuthDatabase.LDAP.txt>
1009 # Path for LDAP configuration file
1010 #args = /etc/dovecot/dovecot-ldap.conf
1013 # vpopmail authentication </usr/share/doc/dovecot-common/wiki/AuthDatabase.VPopMail.txt>
1015 # [cache_key=<key>] - See cache_key in PAM for explanation.
1016 # [quota_template=<template>] - %q expands to Maildir++ quota
1017 # (eg. quota_template=quota_rule=*:backend=%q)
1022 # User database specifies where mails are located and what user/group IDs
1023 # own them. For single-UID configuration use "static".
1025 # </usr/share/doc/dovecot-common/wiki/UserDatabase.txt>
1028 # "prefetch" user database means that the passdb already provided the
1029 # needed information and there's no need to do a separate userdb lookup.
1030 # This can be made to work with SQL and LDAP databases, see their example
1031 # configuration files for more information how to do it.
1032 # </usr/share/doc/dovecot-common/wiki/UserDatabase.Prefetch.txt>
1036 # System users (NSS, /etc/passwd, or similiar). In many systems nowadays this
1037 # uses Name Service Switch, which is configured in /etc/nsswitch.conf.
1038 # </usr/share/doc/dovecot-common/wiki/AuthDatabase.Passwd.txt>
1040 # [blocking=yes] - By default the lookups are done in the main dovecot-auth
1041 # process. This setting causes the lookups to be done in auth worker
1042 # proceses. Useful with remote NSS lookups that may block.
1043 # NOTE: Be sure to use this setting with nss_ldap or users might get
1044 # logged in as each others!
1048 passdb passwd-file {
1049 args = /etc/dovecot/extra-users.passwd
1052 # passwd-like file with specified location
1053 # </usr/share/doc/dovecot-common/wiki/AuthDatabase.PasswdFile.txt>
1054 #userdb passwd-file {
1055 # [username_format=<format>] <Path for passwd-file>
1059 # checkpassword executable user database lookup
1060 # </usr/share/doc/dovecot-common/wiki/AuthDatabase.CheckPassword.txt>
1061 #userdb checkpassword {
1062 # Path for checkpassword binary
1066 # static settings generated from template </usr/share/doc/dovecot-common/wiki/UserDatabase.Static.txt>
1068 # Template for the fields. Can return anything a userdb could normally
1069 # return. For example:
1071 # args = uid=500 gid=500 home=/var/mail/%u
1073 # If you use deliver, it needs to look up users only from the userdb. This
1074 # of course doesn't work with static because there is no list of users.
1075 # Normally static userdb handles this by doing a passdb lookup. This works
1076 # with most passdbs, with PAM being the most notable exception. If you do
1077 # the user verification another way, you can add allow_all_users=yes to
1078 # the args in which case the passdb lookup is skipped.
1083 # SQL database </usr/share/doc/dovecot-common/wiki/AuthDatabase.SQL.txt>
1085 # Path for SQL configuration file
1086 #args = /etc/dovecot/dovecot-sql.conf
1089 # LDAP database </usr/share/doc/dovecot-common/wiki/AuthDatabase.LDAP.txt>
1091 # Path for LDAP configuration file
1092 #args = /etc/dovecot/dovecot-ldap.conf
1095 # vpopmail </usr/share/doc/dovecot-common/wiki/AuthDatabase.VPopMail.txt>
1099 # User to use for the process. This user needs access to only user and
1100 # password databases, nothing else. Only shadow and pam authentication
1101 # requires roots, so use something else if possible. Note that passwd
1102 # authentication with BSDs internally accesses shadow files, which also
1103 # requires roots. Note that this user is NOT used to access mails.
1104 # That user is specified by userdb above.
1107 # Directory where to chroot the process. Most authentication backends don't
1108 # work if this is set, and there's no point chrooting if auth_user is root.
1109 # Note that valid_chroot_dirs isn't needed to use this setting.
1112 # Number of authentication processes to create
1115 # Require a valid SSL client certificate or the authentication fails.
1116 #ssl_require_client_cert = no
1118 # Take the username from client's SSL certificate, using
1119 # X509_NAME_get_text_by_NID() which returns the subject's DN's
1121 #ssl_username_from_cert = no
1123 # It's possible to export the authentication interface to other programs:
1126 # Master socket provides access to userdb information. It's typically
1127 # used to give Dovecot's local delivery agent access to userdb so it
1128 # can find mailbox locations.
1129 path = /var/run/dovecot/auth-master
1131 # Default user/group is the one who started dovecot-auth (root)
1136 # The client socket is generally safe to export to everyone. Typical use
1137 # is to export it to your SMTP server so it can do SMTP AUTH lookups
1139 path = /var/spool/postfix/private/auth
1145 !include_try /etc/dovecot/auth.d/*.auth
1148 # If you wish to use another authentication server than dovecot-auth, you can
1149 # use connect sockets. They are assumed to be already running, Dovecot's master
1150 # process only tries to connect to them. They don't need any other settings
1151 # than the path for the master socket, as the configuration is done elsewhere.
1152 # Note that the client sockets must exist in the login_dir.
1156 # path = /var/run/dovecot/auth-master
1162 ## Dictionary server settings
1165 # Dictionary can be used by some plugins to store key=value lists, such as
1166 # quota, expire and acl plugins. The dictionary can be used either directly or
1167 # though a dictionary server. The following dict block maps dictionary names to
1168 # URIs when the server is used. These can then be referenced using URIs in
1169 # format "proxy::<name>".
1172 #quota = mysql:/etc/dovecot/dovecot-dict-quota.conf
1173 #expire = db:/var/lib/dovecot/expire.db
1176 # Path to Berkeley DB's configuration file. See doc/dovecot-db-example.conf
1184 # Here you can give some extra environment variables to mail processes.
1185 # This is mostly meant for passing parameters to plugins. %variable
1186 # expansion is done for all values.
1188 # Quota plugin. Multiple backends are supported:
1189 # dirsize: Find and sum all the files found from mail directory.
1190 # Extremely SLOW with Maildir. It'll eat your CPU and disk I/O.
1191 # dict: Keep quota stored in dictionary (eg. SQL)
1192 # maildir: Maildir++ quota
1193 # fs: Read-only support for filesystem quota
1195 # Quota limits are set using "quota_rule" parameters, either in here or in
1196 # userdb. It's also possible to give mailbox-specific limits, for example:
1197 # quota_rule = *:storage=1048576
1198 # quota_rule2 = Trash:storage=102400
1199 # User has now 1GB quota, but when saving to Trash mailbox the user gets
1202 # Multiple quota roots are also possible, for example:
1203 # quota = dict:user::proxy::quota
1204 # quota2 = dict:domain:%d:proxy::quota_domain
1205 # quota_rule = *:storage=102400
1206 # quota2_rule = *:storage=1048576
1207 # Gives each user their own 100MB quota and one shared 1GB quota within
1210 # You can execute a given command when user exceeds a specified quota limit.
1211 # Each quota root has separate limits. Only the command for the first
1212 # exceeded limit is excecuted, so put the highest limit first.
1213 # Note that % needs to be escaped as %%, otherwise "% " expands to empty.
1214 # quota_warning = storage=95%% /usr/local/bin/quota-warning.sh 95
1215 # quota_warning2 = storage=80%% /usr/local/bin/quota-warning.sh 80
1218 # ACL plugin. vfile backend reads ACLs from "dovecot-acl" file from maildir
1219 # directory. You can also optionally give a global ACL directory path where
1220 # ACLs are applied to all users' mailboxes. The global ACL directory contains
1221 # one file for each mailbox, eg. INBOX or sub.mailbox. cache_secs parameter
1222 # specifies how many seconds to wait between stat()ing dovecot-acl file
1223 # to see if it changed.
1224 #acl = vfile:/etc/dovecot/dovecot-acls:cache_secs=300
1226 # To let users LIST mailboxes shared by other users, Dovecot needs a
1227 # shared mailbox dictionary. For example:
1228 #acl_shared_dict = file:/var/lib/dovecot/shared-mailboxes
1230 # Convert plugin. If set, specifies the source storage path which is
1231 # converted to destination storage (mail_location) when the user logs in.
1232 # The existing mail directory is renamed to <dir>-converted.
1233 #convert_mail = mbox:%h/mail
1234 # Skip mailboxes which we can't open successfully instead of aborting.
1235 #convert_skip_broken_mailboxes = no
1236 # Skip directories beginning with '.'
1237 #convert_skip_dotdirs = no
1238 # If source storage has mailbox names with destination storage's hierarchy
1239 # separators, replace them with this character.
1240 #convert_alt_hierarchy_char = _
1242 # Trash plugin. When saving a message would make user go over quota, this
1243 # plugin automatically deletes the oldest mails from configured mailboxes
1244 # until the message can be saved within quota limits. The configuration file
1245 # is a text file where each line is in format: <priority> <mailbox name>
1246 # Mails are first deleted in lowest -> highest priority number order
1247 #trash = /etc/dovecot/dovecot-trash.conf
1249 # Expire plugin. Mails are expunged from mailboxes after being there the
1250 # configurable time. The first expiration date for each mailbox is stored in
1251 # a dictionary so it can be quickly determined which mailboxes contain
1252 # expired mails. The actual expunging is done in a nightly cronjob, which
1254 # dovecot --exec-mail ext /usr/lib/dovecot/expire-tool
1255 #expire = Trash 7 Spam 30
1256 #expire_dict = proxy::expire
1258 # Lazy expunge plugin. Currently works only with maildirs. When a user
1259 # expunges mails, the mails are moved to a mailbox in another namespace
1260 # (1st). When a mailbox is deleted, the mailbox is moved to another namespace
1261 # (2nd) as well. Also if the deleted mailbox had any expunged messages,
1262 # they're moved to a 3rd namespace. The mails won't be counted in quota,
1263 # and they're not deleted automatically (use a cronjob or something).
1264 #lazy_expunge = .EXPUNGED/ .DELETED/ .DELETED/.EXPUNGED/
1266 # Events to log. Also available: flag_change append
1267 #mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
1268 # Group events within a transaction to one line.
1269 #mail_log_group_events = no
1270 # Available fields: uid, box, msgid, from, subject, size, vsize, flags
1271 # size and vsize are available only for expunge and copy events.
1272 #mail_log_fields = uid box msgid size
1274 # Sieve plugin (http://wiki.dovecot.org/LDA/Sieve) and ManageSieve service
1276 # Location of the active script. When ManageSieve is used this is actually
1277 # a symlink pointing to the active script in the sieve storage directory.
1278 #sieve=~/.dovecot.sieve
1280 # The path to the directory where the personal Sieve scripts are stored. For
1281 # ManageSieve this is where the uploaded scripts are stored.
1285 # Config files can also be included. deliver doesn't support them currently.
1286 #!include /etc/dovecot/conf.d/*.conf
1287 # Optional configurations, don't give an error if it's not found:
1288 !include_try /etc/dovecot/conf.d/*.conf
1289 #!include_try /etc/dovecot/extra.conf