1 ######################################################################
2 # Runtime configuration file for Exim #
3 ######################################################################
6 # This is a default configuration file which will operate correctly in
7 # uncomplicated installations. Please see the manual for a complete list
8 # of all the runtime configuration options that can be included in a
9 # configuration file. There are many more than are mentioned here. The
10 # manual is in the file doc/spec.txt in the Exim distribution as a plain
11 # ASCII file. Other formats (PostScript, Texinfo, HTML, PDF) are available
12 # from the Exim ftp sites. The manual is also online at the Exim web sites.
15 # This file is divided into several parts, all but the first of which are
16 # headed by a line starting with the word "begin". Only those parts that
17 # are required need to be present. Blank lines, and lines starting with #
21 ########### IMPORTANT ########## IMPORTANT ########### IMPORTANT ###########
23 # Whenever you change Exim's configuration file, you *must* remember to #
24 # HUP the Exim daemon, because it will not pick up the new configuration #
25 # until you do. However, any other Exim processes that are started, for #
26 # example, a process started by an MUA in order to send a message, will #
27 # see the new configuration as soon as it is in place. #
29 # You do not need to HUP the daemon for changes in auxiliary files that #
30 # are referenced from this file. They are read every time they are used. #
32 # It is usually a good idea to test a new configuration for syntactic #
33 # correctness before installing it (for example, by running the command #
34 # "exim -C /config/file.new -bV"). #
36 ########### IMPORTANT ########## IMPORTANT ########### IMPORTANT ###########
40 ######################################################################
41 # MAIN CONFIGURATION SETTINGS #
42 ######################################################################
44 # Log more information
45 # log_selector = +all -arguments
46 log_selector = +smtp_confirmation +queue_time
48 # Specify your host's canonical name here. This should normally be the fully
49 # qualified "official" name of your host. If this option is not set, the
50 # uname() function is called to obtain the name. In many cases this does
51 # the right thing and you need not set anything explicitly.
55 # daemon_smtp_ports = 25 : 465
56 # tls_on_connect_ports = 465
58 # The next three settings create two lists of domains and one list of hosts.
59 # These lists are referred to later in this configuration using the syntax
60 # +local_domains, +relay_to_domains, and +relay_from_hosts, respectively. They
61 # are all colon-separated lists:
63 domainlist local_domains = @
64 domainlist relay_to_domains =
65 hostlist relay_from_hosts = 127.0.0.1
67 # If You wish to enable support for STARTTLS, uncomment folowing lines:
69 # tls_certificate = /etc/openssl/mail.crt
70 # tls_privatekey = /etc/openssl/mail.key
71 # tls_advertise_hosts = *
73 # You can use self-signed cerficates (you will need openssl-tools package):
75 # openssl genrsa -out /etc/openssl/mail.key 1024
76 # openssl req -new -x509 -days 365 -key /etc/openssl/mail.key -out /etc/openssl/mail.crt
78 # Most straightforward access control requirements can be obtained by
79 # appropriate settings of the above options. In more complicated situations, you
80 # may need to modify the Access Control List (ACL) which appears later in this
83 # The first setting specifies your local domains, for example:
85 # domainlist local_domains = my.first.domain : my.second.domain
87 # You can use "@" to mean "the name of the local host", as in the default
88 # setting above. This is the name that is specified by primary_hostname,
89 # as specified above (or defaulted). If you do not want to do any local
90 # deliveries, remove the "@" from the setting above. If you want to accept mail
91 # addressed to your host's literal IP address, for example, mail addressed to
92 # "user@[192.168.23.44]", you can add "@[]" as an item in the local domains
93 # list. You also need to uncomment "allow_domain_literals" below. This is not
94 # recommended for today's Internet.
96 # The second setting specifies domains for which your host is an incoming relay.
97 # If you are not doing any relaying, you should leave the list empty. However,
98 # if your host is an MX backup or gateway of some kind for some domains, you
99 # must set relay_to_domains to match those domains. For example:
101 # domainlist relay_to_domains = *.myco.com : my.friend.org
103 # This will allow any host to relay through your host to those domains.
104 # See the section of the manual entitled "Control of relaying" for more
107 # The third setting specifies hosts that can use your host as an outgoing relay
108 # to any other host on the Internet. Such a setting commonly refers to a
109 # complete local network as well as the localhost. For example:
111 # hostlist relay_from_hosts = 127.0.0.1 : 192.168.0.0/16
113 # The "/16" is a bit mask (CIDR notation), not a number of hosts. Note that you
114 # have to include 127.0.0.1 if you want to allow processes on your host to send
115 # SMTP mail by using the loopback address. A number of MUAs use this method of
119 # All three of these lists may contain many different kinds of item, including
120 # wildcarded names, regular expressions, and file lookups. See the reference
121 # manual for details. The lists above are used in the access control list for
122 # incoming messages. The name of this ACL is defined here:
124 acl_smtp_rcpt = acl_check_rcpt
126 # You should not change that setting until you understand how ACLs work.
128 # The following ACL entries are used if you want to do content scanning with
129 # the exiscan-acl patch. When you uncomment one of these lines, you must also
130 # review the respective entries in the ACL section further below.
132 # acl_smtp_mime = acl_check_mime
133 # acl_smtp_data = acl_check_content
135 # This configuration variable defines the virus scanner that is used with
136 # the 'malware' ACL condition of the exiscan acl-patch. If you do not use
137 # virus scanning, leave it commented. Please read doc/exiscan-acl-readme.txt
138 # for a list of supported scanners.
140 # av_scanner = sophie:/var/run/sophie
142 # The following setting is only needed if you use the 'spam' ACL condition
143 # of the exiscan-acl patch. It specifies on which host and port the SpamAssassin
144 # "spamd" daemon is listening. If you do not use this condition, or you use
145 # the default of "127.0.0.1 783", you can omit this option.
147 # spamd_address = 127.0.0.1 783
149 # Specify the domain you want to be added to all unqualified addresses
150 # here. An unqualified address is one that does not contain an "@" character
151 # followed by a domain. For example, "caesar@rome.example" is a fully qualified
152 # address, but the string "caesar" (i.e. just a login name) is an unqualified
153 # email address. Unqualified addresses are accepted only from local callers by
154 # default. See the recipient_unqualified_hosts option if you want to permit
155 # unqualified addresses from remote sources. If this option is not set, the
156 # primary_hostname value is used for qualification.
161 # If you want unqualified recipient addresses to be qualified with a different
162 # domain to unqualified sender addresses, specify the recipient domain here.
163 # If this option is not set, the qualify_domain value is used.
165 # qualify_recipient =
168 # The following line must be uncommented if you want Exim to recognize
169 # addresses of the form "user@[10.11.12.13]" that is, with a "domain literal"
170 # (an IP address) instead of a named domain. The RFCs still require this form,
171 # but it makes little sense to permit mail to be sent to specific hosts by
172 # their IP address in the modern Internet. This ancient format has been used
173 # by those seeking to abuse hosts by using them for unwanted relaying. If you
174 # really do want to support domain literals, uncomment the following line, and
175 # see also the "domain_literal" router below.
177 # allow_domain_literals
180 # No deliveries will ever be run under the uids of these users (a colon-
181 # separated list). An attempt to do so causes a panic error to be logged, and
182 # the delivery to be deferred. This is a paranoic safety catch. There is an
183 # even stronger safety catch in the form of the FIXED_NEVER_USERS setting
184 # in the configuration for building Exim. The list of users that it specifies
185 # is built into the binary, and cannot be changed. The option below just adds
186 # additional users to the list. The default for FIXED_NEVER_USERS is "root",
187 # but just to be absolutely sure, the default here is also "root".
189 # Note that the default setting means you cannot deliver mail addressed to root
190 # as if it were a normal user. This isn't usually a problem, as most sites have
191 # an alias for root that redirects such mail to a human administrator.
196 # The setting below causes Exim to do a reverse DNS lookup on all incoming
197 # IP calls, in order to get the true host name. If you feel this is too
198 # expensive, you can specify the networks for which a lookup is done, or
199 # remove the setting entirely.
204 # The settings below, which are actually the same as the defaults in the
205 # code, cause Exim to make RFC 1413 (ident) callbacks for all incoming SMTP
206 # calls. You can limit the hosts to which these calls are made, and/or change
207 # the timeout that is used. If you set the timeout to zero, all RFC 1413 calls
208 # are disabled. RFC 1413 calls are cheap and can provide useful information
209 # for tracing problem messages, but some hosts and firewalls have problems
210 # with them. This can result in a timeout instead of an immediate refused
211 # connection, leading to delays on starting up an SMTP session.
214 rfc1413_query_timeout = 30s
217 # By default, Exim expects all envelope addresses to be fully qualified, that
218 # is, they must contain both a local part and a domain. If you want to accept
219 # unqualified addresses (just a local part) from certain hosts, you can specify
220 # these hosts by setting one or both of
222 # sender_unqualified_hosts =
223 # recipient_unqualified_hosts =
225 # to control sender and recipient addresses, respectively. When this is done,
226 # unqualified addresses are qualified using the settings of qualify_domain
227 # and/or qualify_recipient (see above).
230 # If you want Exim to support the "percent hack" for certain domains,
231 # uncomment the following line and provide a list of domains. The "percent
232 # hack" is the feature by which mail addressed to x%y@z (where z is one of
233 # the domains listed) is locally rerouted to x@y and sent on. If z is not one
234 # of the "percent hack" domains, x%y is treated as an ordinary local part. This
235 # hack is rarely needed nowadays; you should not enable it unless you are sure
236 # that you really need it.
238 # percent_hack_domains =
240 # As well as setting this option you will also need to remove the test
241 # for local parts containing % in the ACL definition below.
244 # When Exim can neither deliver a message nor return it to sender, it "freezes"
245 # the delivery error message (aka "bounce message"). There are also other
246 # circumstances in which messages get frozen. They will stay on the queue for
247 # ever unless one of the following options is set.
249 # This option unfreezes frozen bounce messages after two days, tries
250 # once more to deliver them, and ignores any delivery failures.
252 ignore_bounce_errors_after = 2d
254 # This option cancels (removes) frozen messages that are older than a week.
256 timeout_frozen_after = 7d
260 ######################################################################
261 # ACL CONFIGURATION #
262 # Specifies access control lists for incoming SMTP mail #
263 ######################################################################
267 # This access control list is used for every RCPT command in an incoming
268 # SMTP message. The tests are run in order until the address is either
269 # accepted or denied.
273 # Accept if the source is local SMTP (i.e. not over TCP/IP). We do this by
274 # testing for an empty sending host field.
278 #############################################################################
279 # The following section of the ACL is concerned with local parts that contain
280 # @ or % or ! or / or | or dots in unusual places.
282 # The characters other than dots are rarely found in genuine local parts, but
283 # are often tried by people looking to circumvent relaying restrictions.
284 # Therefore, although they are valid in local parts, these rules lock them
285 # out, as a precaution.
287 # Empty components (two dots in a row) are not valid in RFC 2822, but Exim
288 # allows them because they have been encountered. (Consider local parts
289 # constructed as "firstinitial.secondinitial.familyname" when applied to
290 # someone like me, who has no second initial.) However, a local part starting
291 # with a dot or containing /../ can cause trouble if it is used as part of a
292 # file name (e.g. for a mailing list). This is also true for local parts that
293 # contain slashes. A pipe symbol can also be troublesome if the local part is
294 # incorporated unthinkingly into a shell command line.
296 # Two different rules are used. The first one is stricter, and is applied to
297 # messages that are addressed to one of the local domains handled by this
298 # host. It blocks local parts that begin with a dot or contain @ % ! / or |.
299 # If you have local accounts that include these characters, you will have to
302 deny message = Restricted characters in address
303 domains = +local_domains
304 local_parts = ^[.] : ^.*[@%!/|]
306 # The second rule applies to all other domains, and is less strict. This
307 # allows your own users to send outgoing messages to sites that use slashes
308 # and vertical bars in their local parts. It blocks local parts that begin
309 # with a dot, slash, or vertical bar, but allows these characters within the
310 # local part. However, the sequence /../ is barred. The use of @ % and ! is
311 # blocked, as before. The motivation here is to prevent your users (or
312 # your users' viruses) from mounting certain kinds of attack on remote sites.
315 deny message = Restricted characters in address
316 domains = !+local_domains
317 local_parts = ^[./|] : ^.*[@%!] : ^.*/\\.\\./
318 #############################################################################
320 # Accept mail to postmaster in any local domain, regardless of the source,
321 # and without verifying the sender.
323 accept local_parts = postmaster
324 domains = +local_domains
326 # Deny unless the sender address can be verified.
328 require verify = sender
330 #############################################################################
331 # There are no checks on DNS "black" lists because the domains that contain
332 # these lists are changing all the time. However, here are two examples of
333 # how you could get Exim to perform a DNS black list lookup at this point.
334 # The first one denies, while the second just warns.
336 # deny message = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
337 # dnslists = black.list.example
339 # warn message = X-Warning: $sender_host_address is in a black list at $dnslist_domain
340 # log_message = found in $dnslist_domain
341 # dnslists = black.list.example
342 #############################################################################
344 # Accept if the address is in a local domain, but only if the recipient can
345 # be verified. Otherwise deny. The "endpass" line is the border between
346 # passing on to the next ACL statement (if tests above it fail) or denying
347 # access (if tests below it fail).
349 accept domains = +local_domains
353 # Accept if the address is in a domain for which we are relaying, but again,
354 # only if the recipient can be verified.
356 accept domains = +relay_to_domains
359 # If control reaches this point, the domain is neither in +local_domains
360 # nor in +relay_to_domains.
362 # Accept if the message comes from one of the hosts for which we are an
363 # outgoing relay. Recipient verification is omitted here, because in many
364 # cases the clients are dumb MUAs that don't cope well with SMTP error
365 # responses. If you are actually relaying out from MTAs, you should probably
366 # add recipient verification here.
368 accept hosts = +relay_from_hosts
370 # Accept if the message arrived over an authenticated connection, from
371 # any host. Again, these messages are usually from MUAs, so recipient
372 # verification is omitted.
374 accept authenticated = *
376 # Reaching the end of the ACL causes a "deny", but we might as well give
377 # an explicit message.
379 deny message = relay not permitted
381 # These access control lists are used for content scanning with the exiscan-acl
382 # patch. You must also uncomment the entries for acl_smtp_data and acl_smtp_mime
383 # (scroll up), otherwise the ACLs will not be used. IMPORTANT: the default entries here
384 # should be treated as EXAMPLES. You MUST read the file doc/exiscan-acl-spec.txt
385 # to fully understand what you are doing ...
389 # Decode MIME parts to disk. This will support virus scanners later.
390 warn decode = default
392 # File extension filtering.
393 deny message = Blacklisted file extension detected
394 condition = ${if match \
395 {${lc:$mime_filename}} \
396 {\N(\.exe|\.pif|\.bat|\.scr|\.lnk|\.com)$\N} \
399 # Reject messages that carry chinese character sets.
400 # WARNING: This is an EXAMPLE.
401 deny message = Sorry, noone speaks chinese here
402 condition = ${if eq{$mime_charset}{gb2312}{1}{0}}
408 # Reject virus infested messages.
409 deny message = This message contains malware ($malware_name)
412 # Always add X-Spam-Score and X-Spam-Report headers, using SA system-wide settings
413 # (user "nobody"), no matter if over threshold or not.
414 warn message = X-Spam-Score: $spam_score ($spam_bar)
416 warn message = X-Spam-Report: $spam_report
419 # Add X-Spam-Flag if spam is over system-wide threshold
420 warn message = X-Spam-Flag: YES
423 # Reject spam messages with score over 10, using an extra condition.
424 deny message = This message scored $spam_score points. Congratulations!
426 condition = ${if >{$spam_score_int}{100}{1}{0}}
428 # finally accept all the rest
432 ######################################################################
433 # ROUTERS CONFIGURATION #
434 # Specifies how addresses are handled #
435 ######################################################################
436 # THE ORDER IN WHICH THE ROUTERS ARE DEFINED IS IMPORTANT! #
437 # An address is passed to each router in turn until it is accepted. #
438 ######################################################################
442 # This router routes to remote hosts over SMTP by explicit IP address,
443 # when an email address is given in "domain literal" form, for example,
444 # <user@[192.168.35.64]>. The RFCs require this facility. However, it is
445 # little-known these days, and has been exploited by evil people seeking
446 # to abuse SMTP relays. Consequently it is commented out in the default
447 # configuration. If you uncomment this router, you also need to uncomment
448 # allow_domain_literals above, so that Exim can recognize the syntax of
449 # domain literal addresses.
453 # domains = ! +local_domains
454 # transport = remote_smtp
457 # This router routes addresses that are not in local domains by doing a DNS
458 # lookup on the domain name. Any domain that resolves to 0.0.0.0 or to a
459 # loopback interface address (127.0.0.0/8) is treated as if it had no DNS
460 # entry. Note that 0.0.0.0 is the same as 0.0.0.0/32, which is commonly treated
461 # as the local host inside the network stack. It is not 0.0.0.0/0, the default
462 # route. If the DNS lookup fails, no further routers are tried because of
463 # the no_more setting, and consequently the address is unrouteable.
467 domains = ! +local_domains
468 transport = remote_smtp
469 ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
473 # The remaining routers handle addresses in the local domain(s).
476 # This router handles aliasing using a linearly searched alias file with the
477 # name /etc/mail/aliases. When this configuration is installed automatically,
478 # the name gets inserted into this file from whatever is set in Exim's
479 # build-time configuration. The default path is the traditional /etc/aliases.
480 # If you install this configuration by hand, you need to specify the correct
481 # path in the "data" setting below.
483 ##### NB You must ensure that the alias file exists. It used to be the case
484 ##### NB that every Unix had that file, because it was the Sendmail default.
485 ##### NB These days, there are systems that don't have it. Your aliases
486 ##### NB file should at least contain an alias for "postmaster".
488 # If any of your aliases expand to pipes or files, you will need to set
489 # up a user and a group for these deliveries to run under. You can do
490 # this by uncommenting the "user" option below (changing the user name
491 # as appropriate) and adding a "group" option if necessary. Alternatively, you
492 # can specify "user" on the transports that are used. Note that the transports
493 # listed below are the same as are used for .forward files; you might want
494 # to set up different ones for pipe and file deliveries from aliases.
500 data = ${lookup{$local_part}lsearch{/etc/mail/aliases}}
502 file_transport = address_file
503 pipe_transport = address_pipe
506 # This router handles forwarding using traditional .forward files in users'
507 # home directories. If you want it also to allow mail filtering when a forward
508 # file starts with the string "# Exim filter" or "# Sieve filter", uncomment
509 # the "allow_filter" option.
511 # If you want this router to treat local parts with suffixes introduced by "-"
512 # or "+" characters as if the suffixes did not exist, uncomment the two local_
513 # part_suffix options. Then, for example, xxxx-foo@your.domain will be treated
514 # in the same way as xxxx@your.domain by this router. You probably want to make
515 # the same change to the localuser router.
517 # The no_verify setting means that this router is skipped when Exim is
518 # verifying addresses. Similarly, no_expn means that this router is skipped if
519 # Exim is processing an EXPN command.
521 # The check_ancestor option means that if the forward file generates an
522 # address that is an ancestor of the current one, the current one gets
523 # passed on instead. This covers the case where A is aliased to B and B
524 # has a .forward file pointing to A.
526 # The three transports specified at the end are those that are used when
527 # forwarding generates a direct delivery to a file, or to a pipe, or sets
528 # up an auto-reply, respectively.
533 # local_part_suffix = +* : -*
534 # local_part_suffix_optional
535 file = $home/.forward
540 file_transport = address_file
541 pipe_transport = address_pipe
542 reply_transport = address_reply
544 # Procmail. Uncomment following if you want procmail delivery.
549 # local_part_suffix = DSUFFIX*
550 # local_part_suffix_optional
551 # require_files = "${local_part}:+${home}/.procmailrc:\
552 # +/usr/bin/procmail:!${home}/.forward"
553 # transport = procmail_pipe
555 # This router matches local user mailboxes. If the router fails, the error
556 # message is "Unknown user".
558 # If you want this router to treat local parts with suffixes introduced by "-"
559 # or "+" characters as if the suffixes did not exist, uncomment the two local_
560 # part_suffix options. Then, for example, xxxx-foo@your.domain will be treated
561 # in the same way as xxxx@your.domain by this router.
566 # local_part_suffix = +* : -*
567 # local_part_suffix_optional
568 transport = local_delivery
569 cannot_route_message = Unknown user
572 ######################################################################
573 # TRANSPORTS CONFIGURATION #
574 ######################################################################
575 # ORDER DOES NOT MATTER #
576 # Only one appropriate transport is called for each delivery. #
577 ######################################################################
579 # A transport is used only when referenced from a router that successfully
580 # handles an address.
585 # This transport is used for delivering messages over SMTP connections.
591 # This transport is used for local delivery to user mailboxes in traditional
592 # BSD mailbox format. By default it will be run under the uid and gid of the
593 # local user, and requires the sticky bit to be set on the /var/mail directory.
594 # Some systems use the alternative approach of running mail deliveries under a
595 # particular group instead of using the sticky bit. The commented options below
596 # show how this can be done.
600 file = /var/mail/$local_part
607 # Procmail transport. Uncomment following if you want procmail delivery
611 # command = "procmail -f-"
614 # path = "/usr/local/bin:/usr/bin:/bin"
616 # user = ${local_part}
617 # temp_errors= 75 : 75 : 256
622 # This transport is used for handling pipe deliveries generated by alias or
623 # .forward files. If the pipe generates any standard output, it is returned
624 # to the sender of the message as a delivery error. Set return_fail_output
625 # instead of return_output if you want this to happen only when the pipe fails
626 # to complete normally. You can set different transports for aliases and
627 # forwards if you want to - see the references to address_pipe in the routers
635 # This transport is used for handling deliveries directly to files that are
636 # generated by aliasing or forwarding.
645 # This transport is used for handling autoreplies generated by the filtering
646 # option of the userforward router.
653 ######################################################################
654 # RETRY CONFIGURATION #
655 ######################################################################
659 # This single retry rule applies to all domains and all errors. It specifies
660 # retries every 15 minutes for 2 hours, then increasing retry intervals,
661 # starting at 1 hour and increasing each time by a factor of 1.5, up to 16
662 # hours, then retries every 6 hours until 4 days have passed since the first
665 # Domain Error Retries
666 # ------ ----- -------
668 * * F,2h,15m; G,16h,1h,1.5; F,4d,6h
672 ######################################################################
673 # REWRITE CONFIGURATION #
674 ######################################################################
676 # There are no rewriting specifications in this default configuration file.
682 ######################################################################
683 # AUTHENTICATION CONFIGURATION #
684 ######################################################################
686 # There are no authenticator specifications in this default configuration file.
690 # Uncomment lines below to enable SMTP AUTH support. Be aware that this
691 # requires cyrus-sasl-saslauthd package to be installed.
695 # public_name = PLAIN
697 # server_condition = ${if saslauthd{{$2}{$3}{smtp}}{1}{0}}
702 # public_name = LOGIN
703 # server_prompts = "Username:: : Password::"
704 # server_condition = ${if saslauthd{{$1}{$2}{smtp}}{1}{0}}
707 # End of Exim configuration file