3 ### Basic settings for distorted.org.uk Exim configuration
5 ### (c) 2012 Mark Wooding
8 ###----- Licensing notice ---------------------------------------------------
10 ### This program is free software; you can redistribute it and/or modify
11 ### it under the terms of the GNU General Public License as published by
12 ### the Free Software Foundation; either version 2 of the License, or
13 ### (at your option) any later version.
15 ### This program is distributed in the hope that it will be useful,
16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ### GNU General Public License for more details.
20 ### You should have received a copy of the GNU General Public License
21 ### along with this program; if not, write to the Free Software Foundation,
22 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ###--------------------------------------------------------------------------
27 SECTION(global, priv)m4_dnl
28 admin_groups = CONF_admin_groups
29 trusted_groups = CONF_trusted_groups
30 prod_requires_admin = false
32 SECTION(global, logging)m4_dnl
33 log_file_path = : syslog
38 syslog_duplication = false
39 syslog_timestamp = false
41 SECTION(global, daemon)m4_dnl
42 local_interfaces = <; CONF_interfaces
43 extra_local_interfaces = <; 0.0.0.0 ; ::0
45 SECTION(global, resource)m4_dnl
46 deliver_queue_load_max = 8
49 smtp_accept_queue = 32
50 smtp_accept_reserve = 4
51 smtp_load_reserve = 10
52 smtp_reserve_hosts = +trusted
54 SECTION(global, policy)m4_dnl
57 SECTION(global, users)m4_dnl
59 gecos_pattern = ([^,:]*)
61 SECTION(global, incoming)m4_dnl
62 received_header_text = Received: \
63 ${if def:sender_rcvhost \
64 {from $sender_rcvhost\n\t} \
65 {${if def:sender_ident \
66 {from ${quote_local_part:$sender_ident} }}}}\
67 by $primary_hostname \
68 (Exim $version_number)\
69 ${if def:tls_cipher {\n\t} { }}\
70 ${if def:received_protocol \
71 {with $received_protocol \
72 ${if def:tls_cipher {(cipher=$tls_cipher)}}}}\n\t\
73 ${if def:sender_address \
74 {(envelope-from $sender_address\
75 ${if def:authenticated_id \
76 {; auth=$authenticated_id}})\n\t}}\
78 ${if def:received_for {\n\tfor $received_for}}
80 SECTION(global, smtp)m4_dnl
81 smtp_return_error_details = true
82 accept_8bitmime = true
84 SECTION(global, env)m4_dnl
87 SECTION(global, process)m4_dnl
88 extract_addresses_remove_arguments = false
89 headers_charset = utf-8
90 qualify_domain = CONF_master_domain
91 untrusted_set_sender = *
92 local_from_check = false
93 local_sender_retain = true
95 SECTION(global, bounce)m4_dnl
96 delay_warning = 1h : 24h : 2d
98 SECTION(global, tls)m4_dnl
99 tls_certificate = CONF_sysconf_dir/server.certlist
100 tls_privatekey = CONF_sysconf_dir/server.key
101 tls_advertise_hosts = ${if exists {CONF_sysconf_dir/server.key} {*}{}}
102 tls_dhparam = CONF_ca_dir/dh-param-2048.pem
103 tls_require_ciphers = ${if or {{={$received_port}{CONF_submission_port}} \
104 {match_ip {$sender_host_address}{+trusted}}} \
105 {CONF_good_ciphers} \
106 {CONF_acceptable_ciphers}}
107 tls_verify_certificates = CONF_ca_dir/ca.cert
108 tls_verify_hosts = ${if eq{$acl_c_mode}{submission} {} {+allnets}}
111 ###--------------------------------------------------------------------------
112 ### Access control lists.
114 SECTION(global, acl-after)
115 SECTION(global, acl)m4_dnl
117 SECTION(acl, misc)m4_dnl
119 ## Check that the caller's claimed identity is actually plausible.
120 ## This seems like it's a fairly effective filter on spamminess, but
121 ## it's too blunt a tool. Rather than reject, add a warning header.
122 ## Only we can't do this the easy way, so save it up for use in MAIL.
123 ## Also, we're liable to get a subsequent HELO (e.g., after STARTTLS)
124 ## and we should only care about the most recent one.
125 warn set acl_c_helo_warning = false
127 ${if and {{match_ip {$sender_host_address} \
128 {<; 127.0.0.0/8 ; ::1}} \
129 {match_domain {$sender_helo_name} \
130 {localhost : +thishost}}}}
132 ${if exists {CONF_sysconf_dir/helo.conf} \
133 {${lookup {$sender_helo_name} \
135 {CONF_sysconf_dir/helo.conf} \
137 {$sender_host_address} \
140 set acl_c_helo_warning = true
144 SECTION(global, acl)m4_dnl
145 acl_not_smtp_start = not_smtp_start
146 SECTION(acl, misc)m4_dnl
148 ## Record the user's name.
149 warn set acl_c_user = $sender_ident
150 set acl_m_user = $sender_ident
155 SECTION(global, acl)m4_dnl
157 SECTION(acl, mail)m4_dnl
160 ## If we stashed a warning header about HELO from earlier, we should
161 ## add it now. Only don't bother if the client has authenticated
162 ## successfully for submission (because we can't expect mobile
163 ## clients to be properly set up knowing their names), or it's one of
164 ## our own satellites (because they're either properly set up anyway,
165 ## or satellites using us as a smarthost).
166 warn condition = $acl_c_helo_warning
167 !condition = ${if eq{$acl_c_mode}{submission}}
169 WARNING_HEADER(BADHELO,
170 <:Client's HELO doesn't match its IP address.\n\t\
171 helo-name=$sender_helo_name \
172 address=$sender_host_address:>)
174 ## Always allow the empty sender, so that we can receive bounces.
177 ## Ensure that the sender looks valid.
178 require acl = mail_check_sender
180 ## If this is directly from a client then hack on it for a while.
181 warn condition = ${if eq{$acl_c_mode}{submission}}
182 control = submission/sender_retain
184 ## Insist that a local client connect through TLS.
185 deny message = Hosts within CONF_master_domain must use TLS
186 !condition = ${if eq{$acl_c_mode}{submission}}
190 ## Check that a submitted message's sender address is allowable.
191 require acl = mail_check_auth
193 SECTION(acl, mail-tail)m4_dnl
197 SECTION(acl, misc)m4_dnl
200 ## See whether there's a special exception for this sender domain.
201 accept senders = ${LOOKUP_DOMAIN($sender_address_domain,
202 {KV(senders, {$value}{})},
205 ## Ensure that the sender is routable. This is important to prevent
206 ## undeliverable bounces.
207 require message = Invalid sender; \
208 ($sender_verify_failure; $acl_verify_message)
214 SECTION(global, acl)m4_dnl
215 acl_smtp_connect = connect
216 SECTION(acl, connect)m4_dnl
218 SECTION(acl, connect-tail)m4_dnl
219 ## Configure variables according to the submission mode.
220 warn acl = check_submission
226 ## See whether this message needs hacking on.
227 accept !hosts = +thishost
228 !condition = ${if ={$received_port}{CONF_submission_port}}
229 set acl_c_mode = relay
231 ## Remember to apply submission controls.
232 warn set acl_c_mode = submission
237 SECTION(global, acl)m4_dnl
239 SECTION(acl, rcpt)m4_dnl
242 ## Reject if the client isn't allowed to relay and the recipient
243 ## isn't in one of our known domains.
244 require message = Relaying not permitted
247 ## Ensure that the recipient is routable.
248 require message = Invalid recipient \
249 ($recipient_verify_failure; $acl_verify_message)
252 SECTION(acl, misc)m4_dnl
254 ## Accept either if the client is allowed to relay through us, or if
255 ## we're the correct place to send this mail.
257 ## Known clients and authenticated users are OK.
258 accept hosts = CONF_relay_clients
259 accept authenticated = *
261 ## Known domains are OK.
262 accept domains = +public
264 ## Finally, domains in our table are OK, unless they say they aren't.
266 ${if exists{CONF_sysconf_dir/domains.conf} \
267 {partial0-lsearch; CONF_sysconf_dir/domains.conf}}
268 condition = DOMKV(service, {$value}{true})
270 ## Nope, that's not allowed.
273 SECTION(acl, rcpt-tail)m4_dnl
274 ## Everything checks out OK: let this one go through.
277 SECTION(global, acl)m4_dnl
279 SECTION(acl, data)m4_dnl
282 SECTION(acl, data-tail)m4_dnl
285 SECTION(global, acl)m4_dnl
286 acl_smtp_expn = expn_vrfy
287 acl_smtp_vrfy = expn_vrfy
288 SECTION(acl, misc)m4_dnl
290 accept hosts = +trusted
291 deny message = Suck it and see
294 ###--------------------------------------------------------------------------
295 ### Verification of sender address.
297 SECTION(acl, misc)m4_dnl
300 ## If this isn't a submission then it doesn't need checking.
301 accept condition = ${if !eq{$acl_c_mode}{submission}}
303 ## If the caller hasn't formally authenticated, but this is a
304 ## loopback connection, then we can trust identd to tell us the right
305 ## answer. So we should stash the right name somewhere consistent.
306 warn set acl_c_user = $authenticated_id
309 condition = ${if def:sender_ident}
310 set acl_c_user = $sender_ident
312 ## User must be authenticated by now.
313 deny message = Sender not authenticated
314 condition = ${if !def:acl_c_user}
316 ## Set the per-message authentication flag, since we now know that
317 ## there's a sensible value.
318 warn set acl_m_user = $acl_c_user
324 ###--------------------------------------------------------------------------
325 ### Common options for forwarding routers.
327 ## We're pretty permissive here.
328 m4_define(<:FILTER_BASE:>,
336 forbid_blackhole = false
337 check_ancestor = true:>)
339 ## Common options for forwarding routers at verification time.
340 m4_define(<:FILTER_VERIFY:>,
342 user = CONF_filter_user
343 forbid_filter_dlfunc = true
344 forbid_filter_logwrite = true
345 forbid_filter_perl = true
346 forbid_filter_readsocket = true
347 forbid_filter_run = true
348 file_transport = dummy
349 directory_transport = dummy
350 pipe_transport = dummy
351 reply_transport = dummy:>)
353 ## Transports for redirection filters.
354 m4_define(<:FILTER_TRANSPORTS:>,
355 <:file_transport = mailbox
356 directory_transport = maildir
357 pipe_transport = pipe
358 reply_transport = reply:>)
360 m4_define(<:FILTER_ROUTER:>,
367 FILTER_TRANSPORTS<::>$4:>)
370 ###--------------------------------------------------------------------------
373 SECTION(routers, alias)m4_dnl
374 ## Look up the local part in the address map.
379 user = CONF_filter_user
381 local_parts = nwildlsearch; CONF_alias_file
382 data = ${expand:$local_part_data}
383 SECTION(routers, alias-opts)m4_dnl
386 ###--------------------------------------------------------------------------
387 ### Some standard transports.
389 m4_define(<:USER_DELIVERY:>,
390 <:delivery_date_add = true
391 envelope_to_add = true
392 return_path_add = true:>)
394 m4_define(<:APPLY_HEADER_CHANGES:>,
395 <:headers_add = m4_ifelse(<:$1:>, <::>,
397 <:${if def:acl_m_hdradd{$acl_m_hdradd\n}}\
399 headers_remove = m4_ifelse(<:$2:>, <::>,
401 <:${if def:acl_m_hdrrm{$acl_m_hdrrm:}}\
404 SECTION(transports)m4_dnl
405 ## A standard transport for remote delivery. By default, try to do TLS, and
406 ## don't worry too much if it's not very secure: the alternative is sending
407 ## in plaintext anyway. But all of this can be overridden from the
408 ## `domains.conf' file. Annoyingly, the `tls_dh_min_bits' setting isn't
409 ## expanded before use, so we can't set it the obvious way. Instead, encode
410 ## it into the transport name. This is very unpleasant, of course.
414 tls_require_ciphers = CONF_acceptable_ciphers
415 tls_dh_min_bits = 1020
416 tls_tempfail_tryclear = true
418 m4_define(<:SMTP_TRANS_DHBITS:>,
422 hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
423 hosts_require_auth = \
424 ${if bool {DOMKV(require-auth, {$value}{false})} {*}{}}
425 tls_certificate = DOMKV(tls-certificate, {${expand:$value}}fail)
426 tls_privatekey = DOMKV(tls-private-key, {${expand:$value}}fail)
427 tls_verify_certificates = DOMKV(tls-peer-ca, {${expand:$value}}fail)
428 tls_require_ciphers = \
430 {${extract {${expand:$value}} \
431 { good = CONF_good_ciphers \
432 any = CONF_acceptable_ciphers } \
434 {${expand:$value}}}} \
435 {CONF_acceptable_ciphers})
437 tls_tempfail_tryclear = true:>)m4_dnl
439 SMTP_TRANS_DHBITS(1020)
441 SMTP_TRANS_DHBITS(2046)
443 ## Transport to a local SMTP server; use TLS and perform client
448 hosts_require_tls = *
449 tls_certificate = CONF_sysconf_dir/client.certlist
450 tls_privatekey = CONF_sysconf_dir/client.key
451 tls_verify_certificates = CONF_ca_dir/ca.cert
452 tls_require_ciphers = CONF_good_ciphers
453 tls_dh_min_bits = 2046
454 tls_tempfail_tryclear = false
455 authenticated_sender = ${if def:authenticated_id \
456 {$authenticated_id@CONF_master_domain} \
459 ## A standard transport for local delivery.
463 file = /var/mail/$local_part
466 mode_fail_narrower = false
469 ## Transports for user filters.
479 maildir_format = true
486 path = ${if and {{def:home} {exists{$home/bin}}} {$home/bin:} {}}\
487 /usr/local/bin:/usr/local/sbin:\
488 /usr/bin:/usr/sbin:/bin:/sbin
491 return_fail_output = true
494 ## A special dummy transport for use during address verification.
500 ###--------------------------------------------------------------------------
501 ### Retry configuration.
503 SECTION(retry, default)m4_dnl
506 F,2h,15m; G,16h,2h,1.5; F,4d,6h
509 ###----- That's all, folks --------------------------------------------------