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  1. ##
  2. ## Mailbox locations and namespaces
  3. ##
  4.  
  5. # Location for users' mailboxes. The default is empty, which means that Dovecot
  6. # tries to find the mailboxes automatically. This won't work if the user
  7. # doesn't yet have any mail, so you should explicitly tell Dovecot the full
  8. # location.
  9. #
  10. # If you're using mbox, giving a path to the INBOX file (eg. /var/mail/%u)
  11. # isn't enough. You'll also need to tell Dovecot where the other mailboxes are
  12. # kept. This is called the "root mail directory", and it must be the first
  13. # path given in the mail_location setting.
  14. #
  15. # There are a few special variables you can use, eg.:
  16. #
  17. # %u - username
  18. # %n - user part in user@domain, same as %u if there's no domain
  19. # %d - domain part in user@domain, empty if there's no domain
  20. # %h - home directory
  21. #
  22. # See doc/wiki/Variables.txt for full list. Some examples:
  23. #
  24. # mail_location = maildir:~/Maildir
  25. # mail_location = mbox:~/mail:INBOX=/var/mail/%u
  26. # mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
  27. #
  28. # <doc/wiki/MailLocation.txt>
  29. #
  30. #mail_location =
  31. Mail_location = maildir:~/mail
  32. # If you need to set multiple mailbox locations or want to change default
  33. # namespace settings, you can do it by defining namespace sections.
  34. #
  35. # You can have private, shared and public namespaces. Private namespaces
  36. # are for user's personal mails. Shared namespaces are for accessing other
  37. # users' mailboxes that have been shared. Public namespaces are for shared
  38. # mailboxes that are managed by sysadmin. If you create any shared or public
  39. # namespaces you'll typically want to enable ACL plugin also, otherwise all
  40. # users can access all the shared mailboxes, assuming they have permissions
  41. # on filesystem level to do so.
  42. namespace inbox {
  43. # Namespace type: private, shared or public
  44. #type = private
  45.  
  46. # Hierarchy separator to use. You should use the same separator for all
  47. # namespaces or some clients get confused. '/' is usually a good one.
  48. # The default however depends on the underlying mail storage format.
  49. #separator =
  50.  
  51. # Prefix required to access this namespace. This needs to be different for
  52. # all namespaces. For example "Public/".
  53. #prefix =
  54.  
  55. # Physical location of the mailbox. This is in same format as
  56. # mail_location, which is also the default for it.
  57. #location =
  58.  
  59. # There can be only one INBOX, and this setting defines which namespace
  60. # has it.
  61. inbox = yes
  62.  
  63. # If namespace is hidden, it's not advertised to clients via NAMESPACE
  64. # extension. You'll most likely also want to set list=no. This is mostly
  65. # useful when converting from another server with different namespaces which
  66. # you want to deprecate but still keep working. For example you can create
  67. # hidden namespaces with prefixes "~/mail/", "~%u/mail/" and "mail/".
  68. #hidden = no
  69.  
  70. # Show the mailboxes under this namespace with LIST command. This makes the
  71. # namespace visible for clients that don't support NAMESPACE extension.
  72. # "children" value lists child mailboxes, but hides the namespace prefix.
  73. #list = yes
  74.  
  75. # Namespace handles its own subscriptions. If set to "no", the parent
  76. # namespace handles them (empty prefix should always have this as "yes")
  77. #subscriptions = yes
  78. }
  79.  
  80. # Example shared namespace configuration
  81. #namespace {
  82. #type = shared
  83. #separator = /
  84.  
  85. # Mailboxes are visible under "shared/user@domain/"
  86. # %%n, %%d and %%u are expanded to the destination user.
  87. #prefix = shared/%%u/
  88.  
  89. # Mail location for other users' mailboxes. Note that %variables and ~/
  90. # expands to the logged in user's data. %%n, %%d, %%u and %%h expand to the
  91. # destination user's data.
  92. #location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
  93.  
  94. # Use the default namespace for saving subscriptions.
  95. #subscriptions = no
  96.  
  97. # List the shared/ namespace only if there are visible shared mailboxes.
  98. #list = children
  99. #}
  100. # Should shared INBOX be visible as "shared/user" or "shared/user/INBOX"?
  101. #mail_shared_explicit_inbox = no
  102.  
  103. # System user and group used to access mails. If you use multiple, userdb
  104. # can override these by returning uid or gid fields. You can use either numbers
  105. # or names. <doc/wiki/UserIds.txt>
  106. #mail_uid =
  107. #mail_gid =
  108.  
  109. # Group to enable temporarily for privileged operations. Currently this is
  110. # used only with INBOX when either its initial creation or dotlocking fails.
  111. # Typically this is set to "mail" to give access to /var/mail.
  112. #mail_privileged_group =
  113.  
  114. # Grant access to these supplementary groups for mail processes. Typically
  115. # these are used to set up access to shared mailboxes. Note that it may be
  116. # dangerous to set these if users can create symlinks (e.g. if "mail" group is
  117. # set here, ln -s /var/mail ~/mail/var could allow a user to delete others'
  118. # mailboxes, or ln -s /secret/shared/box ~/mail/mybox would allow reading it).
  119. #mail_access_groups =
  120.  
  121. # Allow full filesystem access to clients. There's no access checks other than
  122. # what the operating system does for the active UID/GID. It works with both
  123. # maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/
  124. # or ~user/.
  125. #mail_full_filesystem_access = no
  126.  
  127. # Dictionary for key=value mailbox attributes. Currently used by URLAUTH, but
  128. # soon intended to be used by METADATA as well.
  129. #mail_attribute_dict =
  130.  
  131. ##
  132. ## Mail processes
  133. ##
  134.  
  135. # Don't use mmap() at all. This is required if you store indexes to shared
  136. # filesystems (NFS or clustered filesystem).
  137. #mmap_disable = no
  138.  
  139. # Rely on O_EXCL to work when creating dotlock files. NFS supports O_EXCL
  140. # since version 3, so this should be safe to use nowadays by default.
  141. #dotlock_use_excl = yes
  142.  
  143. # When to use fsync() or fdatasync() calls:
  144. # optimized (default): Whenever necessary to avoid losing important data
  145. # always: Useful with e.g. NFS when write()s are delayed
  146. # never: Never use it (best performance, but crashes can lose data)
  147. #mail_fsync = optimized
  148.  
  149. # Mail storage exists in NFS. Set this to yes to make Dovecot flush NFS caches
  150. # whenever needed. If you're using only a single mail server this isn't needed.
  151. #mail_nfs_storage = no
  152. # Mail index files also exist in NFS. Setting this to yes requires
  153. # mmap_disable=yes and fsync_disable=no.
  154. #mail_nfs_index = no
  155.  
  156. # Locking method for index files. Alternatives are fcntl, flock and dotlock.
  157. # Dotlocking uses some tricks which may create more disk I/O than other locking
  158. # methods. NFS users: flock doesn't work, remember to change mmap_disable.
  159. #lock_method = fcntl
  160.  
  161. # Directory in which LDA/LMTP temporarily stores incoming mails >128 kB.
  162. #mail_temp_dir = /tmp
  163.  
  164. # Valid UID range for users, defaults to 500 and above. This is mostly
  165. # to make sure that users can't log in as daemons or other system users.
  166. # Note that denying root logins is hardcoded to dovecot binary and can't
  167. # be done even if first_valid_uid is set to 0.
  168. first_valid_uid = 1000
  169. #last_valid_uid = 0
  170.  
  171. # Valid GID range for users, defaults to non-root/wheel. Users having
  172. # non-valid GID as primary group ID aren't allowed to log in. If user
  173. # belongs to supplementary groups with non-valid GIDs, those groups are
  174. # not set.
  175. #first_valid_gid = 1
  176. #last_valid_gid = 0
  177.  
  178. # Maximum allowed length for mail keyword name. It's only forced when trying
  179. # to create new keywords.
  180. #mail_max_keyword_length = 50
  181.  
  182. # ':' separated list of directories under which chrooting is allowed for mail
  183. # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too).
  184. # This setting doesn't affect login_chroot, mail_chroot or auth chroot
  185. # settings. If this setting is empty, "/./" in home dirs are ignored.
  186. # WARNING: Never add directories here which local users can modify, that
  187. # may lead to root exploit. Usually this should be done only if you don't
  188. # allow shell access for users. <doc/wiki/Chrooting.txt>
  189. #valid_chroot_dirs =
  190.  
  191. # Default chroot directory for mail processes. This can be overridden for
  192. # specific users in user database by giving /./ in user's home directory
  193. # (eg. /home/./user chroots into /home). Note that usually there is no real
  194. # need to do chrooting, Dovecot doesn't allow users to access files outside
  195. # their mail directory anyway. If your home directories are prefixed with
  196. # the chroot directory, append "/." to mail_chroot. <doc/wiki/Chrooting.txt>
  197. #mail_chroot =
  198.  
  199. # UNIX socket path to master authentication server to find users.
  200. # This is used by imap (for shared users) and lda.
  201. #auth_socket_path = /var/run/dovecot/auth-userdb
  202.  
  203. # Directory where to look up mail plugins.
  204. #mail_plugin_dir = /usr/lib/dovecot
  205.  
  206. # Space separated list of plugins to load for all services. Plugins specific to
  207. # IMAP, LDA, etc. are added to this list in their own .conf files.
  208. #mail_plugins =
  209.  
  210. ##
  211. ## Mailbox handling optimizations
  212. ##
  213.  
  214. # Mailbox list indexes can be used to optimize IMAP STATUS commands. They are
  215. # also required for IMAP NOTIFY extension to be enabled.
  216. #mailbox_list_index = no
  217.  
  218. # The minimum number of mails in a mailbox before updates are done to cache
  219. # file. This allows optimizing Dovecot's behavior to do less disk writes at
  220. # the cost of more disk reads.
  221. #mail_cache_min_mail_count = 0
  222.  
  223. # When IDLE command is running, mailbox is checked once in a while to see if
  224. # there are any new mails or other changes. This setting defines the minimum
  225. # time to wait between those checks. Dovecot can also use dnotify, inotify and
  226. # kqueue to find out immediately when changes occur.
  227. #mailbox_idle_check_interval = 30 secs
  228.  
  229. # Save mails with CR+LF instead of plain LF. This makes sending those mails
  230. # take less CPU, especially with sendfile() syscall with Linux and FreeBSD.
  231. # But it also creates a bit more disk I/O which may just make it slower.
  232. # Also note that if other software reads the mboxes/maildirs, they may handle
  233. # the extra CRs wrong and cause problems.
  234. #mail_save_crlf = no
  235.  
  236. # Max number of mails to keep open and prefetch to memory. This only works with
  237. # some mailbox formats and/or operating systems.
  238. #mail_prefetch_count = 0
  239.  
  240. # How often to scan for stale temporary files and delete them (0 = never).
  241. # These should exist only after Dovecot dies in the middle of saving mails.
  242. #mail_temp_scan_interval = 1w
  243.  
  244. ##
  245. ## Maildir-specific settings
  246. ##
  247.  
  248. # By default LIST command returns all entries in maildir beginning with a dot.
  249. # Enabling this option makes Dovecot return only entries which are directories.
  250. # This is done by stat()ing each entry, so it causes more disk I/O.
  251. # (For systems setting struct dirent->d_type, this check is free and it's
  252. # done always regardless of this setting)
  253. #maildir_stat_dirs = no
  254.  
  255. # When copying a message, do it with hard links whenever possible. This makes
  256. # the performance much better, and it's unlikely to have any side effects.
  257. #maildir_copy_with_hardlinks = yes
  258.  
  259. # Assume Dovecot is the only MUA accessing Maildir: Scan cur/ directory only
  260. # when its mtime changes unexpectedly or when we can't find the mail otherwise.
  261. #maildir_very_dirty_syncs = no
  262.  
  263. # If enabled, Dovecot doesn't use the S=<size> in the Maildir filenames for
  264. # getting the mail's physical size, except when recalculating Maildir++ quota.
  265. # This can be useful in systems where a lot of the Maildir filenames have a
  266. # broken size. The performance hit for enabling this is very small.
  267. #maildir_broken_filename_sizes = no
  268.  
  269. ##
  270. ## mbox-specific settings
  271. ##
  272.  
  273. # Which locking methods to use for locking mbox. There are four available:
  274. # dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe
  275. # solution. If you want to use /var/mail/ like directory, the users
  276. # will need write access to that directory.
  277. # dotlock_try: Same as dotlock, but if it fails because of permissions or
  278. # because there isn't enough disk space, just skip it.
  279. # fcntl : Use this if possible. Works with NFS too if lockd is used.
  280. # flock : May not exist in all systems. Doesn't work with NFS.
  281. # lockf : May not exist in all systems. Doesn't work with NFS.
  282. #
  283. # You can use multiple locking methods; if you do the order they're declared
  284. # in is important to avoid deadlocks if other MTAs/MUAs are using multiple
  285. # locking methods as well. Some operating systems don't allow using some of
  286. # them simultaneously.
  287. #mbox_read_locks = fcntl
  288. #mbox_write_locks = dotlock fcntl
  289. mbox_write_locks = fcntl
  290.  
  291. # Maximum time to wait for lock (all of them) before aborting.
  292. #mbox_lock_timeout = 5 mins
  293.  
  294. # If dotlock exists but the mailbox isn't modified in any way, override the
  295. # lock file after this much time.
  296. #mbox_dotlock_change_timeout = 2 mins
  297.  
  298. # When mbox changes unexpectedly we have to fully read it to find out what
  299. # changed. If the mbox is large this can take a long time. Since the change
  300. # is usually just a newly appended mail, it'd be faster to simply read the
  301. # new mails. If this setting is enabled, Dovecot does this but still safely
  302. # fallbacks to re-reading the whole mbox file whenever something in mbox isn't
  303. # how it's expected to be. The only real downside to this setting is that if
  304. # some other MUA changes message flags, Dovecot doesn't notice it immediately.
  305. # Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK
  306. # commands.
  307. #mbox_dirty_syncs = yes
  308.  
  309. # Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,
  310. # EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.
  311. #mbox_very_dirty_syncs = no
  312.  
  313. # Delay writing mbox headers until doing a full write sync (EXPUNGE and CHECK
  314. # commands and when closing the mailbox). This is especially useful for POP3
  315. # where clients often delete all mails. The downside is that our changes
  316. # aren't immediately visible to other MUAs.
  317. #mbox_lazy_writes = yes
  318.  
  319. # If mbox size is smaller than this (e.g. 100k), don't write index files.
  320. # If an index file already exists it's still read, just not updated.
  321. #mbox_min_index_size = 0
  322.  
  323. # Mail header selection algorithm to use for MD5 POP3 UIDLs when
  324. # pop3_uidl_format=%m. For backwards compatibility we use apop3d inspired
  325. # algorithm, but it fails if the first Received: header isn't unique in all
  326. # mails. An alternative algorithm is "all" that selects all headers.
  327. #mbox_md5 = apop3d
  328.  
  329. ##
  330. ## mdbox-specific settings
  331. ##
  332.  
  333. # Maximum dbox file size until it's rotated.
  334. #mdbox_rotate_size = 2M
  335.  
  336. # Maximum dbox file age until it's rotated. Typically in days. Day begins
  337. # from midnight, so 1d = today, 2d = yesterday, etc. 0 = check disabled.
  338. #mdbox_rotate_interval = 0
  339.  
  340. # When creating new mdbox files, immediately preallocate their size to
  341. # mdbox_rotate_size. This setting currently works only in Linux with some
  342. # filesystems (ext4, xfs).
  343. #mdbox_preallocate_space = no
  344.  
  345. ##
  346. ## Mail attachments
  347. ##
  348.  
  349. # sdbox and mdbox support saving mail attachments to external files, which
  350. # also allows single instance storage for them. Other backends don't support
  351. # this for now.
  352.  
  353. # Directory root where to store mail attachments. Disabled, if empty.
  354. #mail_attachment_dir =
  355.  
  356. # Attachments smaller than this aren't saved externally. It's also possible to
  357. # write a plugin to disable saving specific attachments externally.
  358. #mail_attachment_min_size = 128k
  359.  
  360. # Filesystem backend to use for saving attachments:
  361. # posix : No SiS done by Dovecot (but this might help FS's own deduplication)
  362. # sis posix : SiS with immediate byte-by-byte comparison during saving
  363. # sis-queue posix : SiS with delayed comparison and deduplication
  364. #mail_attachment_fs = sis posix
  365.  
  366. # Hash format to use in attachment filenames. You can add any text and
  367. # variables: %{md4}, %{md5}, %{sha1}, %{sha256}, %{sha512}, %{size}.
  368. # Variables can be truncated, e.g. %{sha256:80} returns only first 80 bits
  369. #mail_attachment_hash = %{sha1}
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