4 This file contains descriptions of new features that have been added to Exim.
5 Before a formal release, there may be quite a lot of detail so that people can
6 test from the snapshots or the CVS before the documentation is updated. Once
7 the documentation is updated, this file is reduced to a short list.
12 1. New command-line option -bI:sieve will list all supported sieve extensions
13 of this Exim build on standard output, one per line.
14 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
15 query this to establish the correct list to include in the protocol's
16 SIEVE capability line.
18 2. If the -n option is combined with the -bP option, then the name of an
19 emitted option is not output, only the value (if visible to you).
20 For instance, "exim -n -bP pid_file_path" should just emit a pathname
21 followed by a newline, and no other text.
23 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
24 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
25 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
26 acceptable for security. (Option accepted but ignored if using OpenSSL).
27 Defaults to 1024, the old value. May be lowered only to 512, or raised as
28 far as you like. Raising this may hinder TLS interoperability with other
29 sites and is not currently recommended. Lowering this will permit you to
30 establish a TLS session which is not as secure as you might like.
32 Unless you really know what you are doing, leave it alone.
34 4. If not built with DISABLE_DNSSEC, Exim now has the main option
35 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
36 to send the DO flag to your recursive resolver. If you have a recursive
37 resolver, which can set the Authenticated Data (AD) flag in results, Exim
38 can now detect this. Exim does not perform validation itself, instead
39 relying upon a trusted path to the resolver.
41 Current status: work-in-progress; $sender_host_dnssec variable added.
43 5. DSCP support for outbound connections: on a transport using the smtp driver,
44 set "dscp = ef", for instance, to cause the connections to have the relevant
45 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
47 Similarly for inbound connections, there is a new control modifier, dscp,
48 so "warn control = dscp/ef" in the connect ACL, or after authentication.
50 Supported values depend upon system libraries. "exim -bI:dscp" to list the
51 ones Exim knows of. You can also set a raw number 0..0x3F.
53 6. The -G command-line flag is no longer ignored; it is now equivalent to an
54 ACL setting "control = suppress_local_fixups". The -L command-line flag
55 is now accepted and forces use of syslog, with the provided tag as the
56 process name. A few other flags used by Sendmail are now accepted and
59 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
60 ACL modifier; works for single-recipient mails which are recieved on and
61 deliverable via SMTP. Using the connection made for a recipient verify,
62 if requested before the verify, or a new one made for the purpose while
63 the inbound connection is still active. The bulk of the mail item is copied
64 direct from the inbound socket to the outbound (as well as the spool file).
65 When the source notifies the end of data, the data acceptance by the destination
66 is negociated before the acceptance is sent to the source. If the destination
67 does not accept the mail item, for example due to content-scanning, the item
68 is not accepted from the source and therefore there is no need to generate
69 a bounce mail. This is of benefit when providing a secondary-MX service.
70 The downside is that delays are under the control of the ultimate destination
73 The Recieved-by: header on items delivered by cutthrough is generated
74 early in reception rather than at the end; this will affect any timestamp
75 included. The log line showing delivery is recorded before that showing
76 reception; it uses a new ">>" tag instead of "=>".
78 To support the feature, verify-callout connections can now use ESMTP and TLS.
79 The usual smtp transport options are honoured, plus a (new, default everything)
80 hosts_verify_avoid_tls.
82 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
83 for specific access to the information for each connection. The old names
84 are present for now but deprecated.
86 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
88 8. New expansion operators ${listnamed:name} to get the content of a named list
89 and ${listcount:string} to count the items in a list.
91 9. New global option "gnutls_enable_pkcs11", defaults false. The GnuTLS
92 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
93 modules. For some situations this is desirable, but we expect admin in
94 those situations to know they want the feature. More commonly, it means
95 that GUI user modules get loaded and are broken by the setuid Exim being
96 unable to access files specified in environment variables and passed
97 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
98 unless this new option is set.
100 10. The "acl = name" condition on an ACL now supports optional arguments.
101 New expansion item "${acl {name}{arg}...}" and expansion condition
102 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
103 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
104 Variable $acl_narg contains the number of arguments. If the ACL sets
105 a "message =" value this becomes the result of the expansion item,
106 or the value of $value for the expansion condition. If the ACL returns
107 accept the expansion condition is true; if reject, false. A defer
108 return results in a forced fail.
110 11. Routers and transports can now have multiple headers_add and headers_remove
111 option lines. The concatenated list is used.
113 12. New ACL modifier "remove_header" can remove headers before message gets
114 handled by routers/transports.
116 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
117 "aaaa" and "a" lookups is done and the full set of results returned.
119 14. New expansion variable $headers_added with content from ACL add_header
120 modifier (but not yet added to messsage).
122 15. New 8bitmime status logging option for received messages. Log field "M8S".
124 16. New authenticated_sender logging option, adding to log field "A".
126 17. New expansion variables $router_name and $transport_name. Useful
127 particularly for debug_print as -bt commandline option does not
128 require privilege whereas -d does.
130 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
131 proposed extension to SMTP from Eric Hall.
133 19. The pipe transport has gained the force_command option, to allow
134 decorating commands from user .forward pipe aliases with prefix
135 wrappers, for instance.
137 20. Callout connections can now AUTH; the same controls as normal delivery
140 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
141 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
142 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
143 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
144 dmarc_status. It adds new control flags dmarc_disable_verify and
145 dmarc_enable_forensic.
147 22. Add expansion variable $authenticated_fail_id, which is the username
148 provided to the authentication method which failed. It is available
149 for use in subsequent ACL processing (typically quit or notquit ACLs).
151 23. New ACL modifer "udpsend" can construct a UDP packet to send to a given
154 24. New ${hexquote:..string..} expansion operator converts non-printable
155 characters in the string to \xNN form.
157 25. Experimental TPDA (Transport Post Delivery Action) function added.
158 Patch provided by Axel Rau.
160 26. Experimental Redis lookup added. Patch provided by Warren Baker.
166 1. New authenticator driver, "gsasl". Server-only (at present).
167 This is a SASL interface, licensed under GPL, which can be found at
168 http://www.gnu.org/software/gsasl/.
169 This system does not provide sources of data for authentication, so
170 careful use needs to be made of the conditions in Exim.
172 2. New authenticator driver, "heimdal_gssapi". Server-only.
173 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
174 is no longer honoured for setuid programs by Heimdal. Use the
175 "server_keytab" option to point to the keytab.
177 3. The "pkg-config" system can now be used when building Exim to reference
178 cflags and library information for lookups and authenticators, rather
179 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
180 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
181 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
183 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
184 find the headers and libraries for PCRE.
186 4. New expansion variable $tls_bits.
188 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
189 be joined together with ASCII NUL characters to construct the key to pass
190 into the DBM library. Can be used with gsasl to access sasldb2 files as
193 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
195 Avoid release 1.0.1a if you can. Note that the default value of
196 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
197 increased susceptibility to attack. This may still have interoperability
198 implications for very old clients (see version 4.31 change 37) but
199 administrators can choose to make the trade-off themselves and restore
200 compatibility at the cost of session security.
202 7. Use of the new expansion variable $tls_sni in the main configuration option
203 tls_certificate will cause Exim to re-expand the option, if the client
204 sends the TLS Server Name Indication extension, to permit choosing a
205 different certificate; tls_privatekey will also be re-expanded. You must
206 still set these options to expand to valid files when $tls_sni is not set.
208 The SMTP Transport has gained the option tls_sni, which will set a hostname
209 for outbound TLS sessions, and set $tls_sni too.
211 A new log_selector, +tls_sni, has been added, to log received SNI values
212 for Exim as a server.
214 8. The existing "accept_8bitmime" option now defaults to true. This means
215 that Exim is deliberately not strictly RFC compliant. We're following
216 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
217 Those who disagree, or know that they are talking to mail servers that,
218 even today, are not 8-bit clean, need to turn off this option.
220 9. Exim can now be started with -bw (with an optional timeout, given as
221 -bw<timespec>). With this, stdin at startup is a socket that is
222 already listening for connections. This has a more modern name of
223 "socket activation", but forcing the activated socket to fd 0. We're
224 interested in adding more support for modern variants.
226 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
227 for numbers indicates multiplication by 1024^3.
229 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
230 gnutls_require_mac & gnutls_require_protocols are no longer supported.
231 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
232 string, documentation for which is at:
233 http://www.gnutls.org/manual/html_node/Priority-Strings.html
235 SNI support has been added to Exim's GnuTLS integration too.
237 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
238 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
240 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
241 is now available. If the contents of the file are valid, then Exim will
242 send that back in response to a TLS status request; this is OCSP Stapling.
243 Exim will not maintain the contents of the file in any way: administrators
244 are responsible for ensuring that it is up-to-date.
246 See "experimental-spec.txt" for more details.
248 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
249 identically to TXT record lookups.
251 14. New expansion variable $tod_epoch_l for higher-precision time.
253 15. New global option tls_dh_max_bits, defaulting to current value of NSS
254 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
255 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
257 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
258 Option can now be a path or an identifier for a standard prime.
259 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
260 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
263 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
264 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
265 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
271 1. New options for the ratelimit ACL condition: /count= and /unique=.
272 The /noupdate option has been replaced by a /readonly option.
274 2. The SMTP transport's protocol option may now be set to "smtps", to
275 use SSL-on-connect outbound.
277 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
278 there is a problem talking to the AV scanner, or the AV scanner running.
280 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
281 and check if the search item is a member of the list. This does not
282 support named lists, but does subject the list part to string expansion.
284 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
285 built, Exim no longer performs string expansion on the second string of
286 the match_* expansion conditions: "match_address", "match_domain",
287 "match_ip" & "match_local_part". Named lists can still be used.
293 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
294 or off in the resolver library.
300 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
301 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
302 libraries. The following global options have been added in support of
303 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
304 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
306 2. The pipe transport now takes a boolean option, "freeze_signal", default
307 false. When true, if the external delivery command exits on a signal then
308 Exim will freeze the message in the queue, instead of generating a bounce.
310 3. Log filenames may now use %M as an escape, instead of %D (still available).
311 The %M pattern expands to yyyymm, providing month-level resolution.
313 4. The $message_linecount variable is now updated for the maildir_tag option,
314 in the same way as $message_size, to reflect the real number of lines,
315 including any header additions or removals from transport.
317 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
318 Exim now selects entries randomly, to better scale in a cluster setup.
324 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
325 the flaw permitted the Exim run-time user to cause root to append to
326 arbitrary files of the attacker's choosing, with the content based
327 on content supplied by the attacker.
329 2. Exim now supports loading some lookup types at run-time, using your
330 platform's dlopen() functionality. This has limited platform support
331 and the intention is not to support every variant, it's limited to
332 dlopen(). This permits the main Exim binary to not be linked against
333 all the libraries needed for all the lookup types.
339 NOTE: this version is not guaranteed backwards-compatible, please read the
340 items below carefully
342 1. A new main configuration option, "openssl_options", is available if Exim
343 is built with SSL support provided by OpenSSL. The option allows
344 administrators to specify OpenSSL options to be used on connections;
345 typically this is to set bug compatibility features which the OpenSSL
346 developers have not enabled by default. There may be security
347 consequences for certain options, so these should not be changed
350 2. A new pipe transport option, "permit_coredumps", may help with problem
351 diagnosis in some scenarios. Note that Exim is typically installed as
352 a setuid binary, which on most OSes will inhibit coredumps by default,
353 so that safety mechanism would have to be overridden for this option to
354 be able to take effect.
356 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
357 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
358 Note that this switches Exim to use a new API ("INSTREAM") and a future
359 release of ClamAV will remove support for the old API ("STREAM").
361 The av_scanner option, when set to "clamd", now takes an optional third
362 part, "local", which causes Exim to pass a filename to ClamAV instead of
363 the file content. This is the same behaviour as when clamd is pointed at
364 a Unix-domain socket. For example:
366 av_scanner = clamd:192.0.2.3 1234:local
368 ClamAV's ExtendedDetectionInfo response format is now handled.
370 4. There is now a -bmalware option, restricted to admin users. This option
371 takes one parameter, a filename, and scans that file with Exim's
372 malware-scanning framework. This is intended purely as a debugging aid
373 to ensure that Exim's scanning is working, not to replace other tools.
374 Note that the ACL framework is not invoked, so if av_scanner references
375 ACL variables without a fallback then this will fail.
377 5. There is a new expansion operator, "reverse_ip", which will reverse IP
378 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
380 ${reverse_ip:192.0.2.4}
382 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
383 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
385 6. There is a new ACL control called "debug", to enable debug logging.
386 This allows selective logging of certain incoming transactions within
387 production environments, with some care. It takes two options, "tag"
388 and "opts"; "tag" is included in the filename of the log and "opts"
389 is used as per the -d<options> command-line option. Examples, which
390 don't all make sense in all contexts:
393 control = debug/tag=.$sender_host_address
394 control = debug/opts=+expand+acl
395 control = debug/tag=.$message_exim_id/opts=+expand
397 7. It has always been implicit in the design and the documentation that
398 "the Exim user" is not root. src/EDITME said that using root was
399 "very strongly discouraged". This is not enough to keep people from
400 shooting themselves in the foot in days when many don't configure Exim
401 themselves but via package build managers. The security consequences of
402 running various bits of network code are severe if there should be bugs in
403 them. As such, the Exim user may no longer be root. If configured
404 statically, Exim will refuse to build. If configured as ref:user then Exim
405 will exit shortly after start-up. If you must shoot yourself in the foot,
406 then henceforth you will have to maintain your own local patches to strip
409 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
410 condition logic to determine truth/failure and will fail to expand many
411 strings, bool_lax{} uses the router condition logic, where most strings
413 Note: bool{00} is false, bool_lax{00} is true.
415 9. Routers now support multiple "condition" tests.
417 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
418 Setting this allows an admin to define which entry in the tcpwrappers
419 config file will be used to control access to the daemon. This option
420 is only available when Exim is built with USE_TCP_WRAPPERS. The
421 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
424 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
425 the Exim run-time user, instead of root.
427 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
428 is forced on. This is mitigated by the new build option
429 TRUSTED_CONFIG_LIST which defines a list of configuration files which
430 are trusted; one per line. If a config file is owned by root and matches
431 a pathname in the list, then it may be invoked by the Exim build-time
432 user without Exim relinquishing root privileges.
434 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
435 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
436 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
437 include the main config. As a transition mechanism, we are temporarily
438 providing a work-around: the new build option WHITELIST_D_MACROS provides
439 a colon-separated list of macro names which may be overridden by the Exim
440 run-time user. The values of these macros are constrained to the regex
441 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
447 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
448 writable, the other to locking of MBX folders (not mbox).
450 2. MySQL stored procedures are now supported.
452 3. The dkim_domain transport option is now a list, not a single string, and
453 messages will be signed for each element in the list (discarding
456 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
457 in the presence of multiple character strings within the RR. Prior to 4.70,
458 only the first string would be returned. The dnsdb lookup now, by default,
459 preserves the pre-4.70 semantics, but also now takes an extended output
460 separator specification. The separator can be followed by a semicolon, to
461 concatenate the individual text strings together with no join character,
462 or by a comma and a second separator character, in which case the text
463 strings within a TXT record are joined on that second character.
464 Administrators are reminded that DNS provides no ordering guarantees
465 between multiple records in an RRset. For example:
467 foo.example. IN TXT "a" "b" "c"
468 foo.example. IN TXT "d" "e" "f"
470 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
471 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
472 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
478 1. Native DKIM support without an external library.
479 (Note that if no action to prevent it is taken, a straight upgrade will
480 result in DKIM verification of all signed incoming emails. See spec
481 for details on conditionally disabling)
483 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
485 3. There is now a bool{} expansion condition which maps certain strings to
486 true/false condition values (most likely of use in conjunction with the
487 and{} expansion operator).
489 4. The $spam_score, $spam_bar and $spam_report variables are now available
492 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
493 options, provided that Exim is invoked by an admin_user.
495 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
496 which increases compatibility with older clients at the cost of decreased
497 security. Don't set this unless you need to support such clients.
499 7. There is a new expansion operator, ${randint:...} which will produce a
500 "random" number less than the supplied integer. This randomness is
501 not guaranteed to be cryptographically strong, but depending upon how
502 Exim was built may be better than the most naive schemes.
504 8. Exim now explicitly ensures that SHA256 is available when linked against
507 9. The transport_filter_timeout option now applies to SMTP transports too.
513 1. Preliminary DKIM support in Experimental.
519 1. The body_linecount and body_zerocount C variables are now exported in the
522 2. When a dnslists lookup succeeds, the key that was looked up is now placed
523 in $dnslist_matched. When the key is an IP address, it is not reversed in
524 this variable (though it is, of course, in the actual lookup). In simple
527 deny dnslists = spamhaus.example
529 the key is also available in another variable (in this case,
530 $sender_host_address). In more complicated cases, however, this is not
531 true. For example, using a data lookup might generate a dnslists lookup
534 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
536 If this condition succeeds, the value in $dnslist_matched might be
537 192.168.6.7 (for example).
539 3. Authenticators now have a client_condition option. When Exim is running as
540 a client, it skips an authenticator whose client_condition expansion yields
541 "0", "no", or "false". This can be used, for example, to skip plain text
542 authenticators when the connection is not encrypted by a setting such as:
544 client_condition = ${if !eq{$tls_cipher}{}}
546 Note that the 4.67 documentation states that $tls_cipher contains the
547 cipher used for incoming messages. In fact, during SMTP delivery, it
548 contains the cipher used for the delivery. The same is true for
551 4. There is now a -Mvc <message-id> option, which outputs a copy of the
552 message to the standard output, in RFC 2822 format. The option can be used
553 only by an admin user.
555 5. There is now a /noupdate option for the ratelimit ACL condition. It
556 computes the rate and checks the limit as normal, but it does not update
557 the saved data. This means that, in relevant ACLs, it is possible to lookup
558 the existence of a specified (or auto-generated) ratelimit key without
559 incrementing the ratelimit counter for that key.
561 In order for this to be useful, another ACL entry must set the rate
562 for the same key somewhere (otherwise it will always be zero).
567 # Read the rate; if it doesn't exist or is below the maximum
569 deny ratelimit = 100 / 5m / strict / noupdate
570 log_message = RATE: $sender_rate / $sender_rate_period \
571 (max $sender_rate_limit)
573 [... some other logic and tests...]
575 warn ratelimit = 100 / 5m / strict / per_cmd
576 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
577 (max $sender_rate_limit)
578 condition = ${if le{$sender_rate}{$sender_rate_limit}}
582 6. The variable $max_received_linelength contains the number of bytes in the
583 longest line that was received as part of the message, not counting the
584 line termination character(s).
586 7. Host lists can now include +ignore_defer and +include_defer, analagous to
587 +ignore_unknown and +include_unknown. These options should be used with
588 care, probably only in non-critical host lists such as whitelists.
590 8. There's a new option called queue_only_load_latch, which defaults true.
591 If set false when queue_only_load is greater than zero, Exim re-evaluates
592 the load for each incoming message in an SMTP session. Otherwise, once one
593 message is queued, the remainder are also.
595 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
596 cases when an SMTP session ends without sending QUIT. However, when Exim
597 itself is is bad trouble, such as being unable to write to its log files,
598 this ACL is not run, because it might try to do things (such as write to
599 log files) that make the situation even worse.
601 Like the QUIT ACL, this new ACL is provided to make it possible to gather
602 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
603 modifier is forbidden in this ACL.
605 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
606 to a string that indicates the reason for the termination of the SMTP
607 connection. The possible values are:
609 acl-drop Another ACL issued a "drop" command
610 bad-commands Too many unknown or non-mail commands
611 command-timeout Timeout while reading SMTP commands
612 connection-lost The SMTP connection has been lost
613 data-timeout Timeout while reading message data
614 local-scan-error The local_scan() function crashed
615 local-scan-timeout The local_scan() function timed out
616 signal-exit SIGTERM or SIGINT
617 synchronization-error SMTP synchronization error
618 tls-failed TLS failed to start
620 In most cases when an SMTP connection is closed without having received
621 QUIT, Exim sends an SMTP response message before actually closing the
622 connection. With the exception of acl-drop, the default message can be
623 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
624 "drop" verb in another ACL, it is the message from the other ACL that is
627 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
628 servers with individual queries. This is done by starting the query with
629 "servers=x:y:z;", where each item in the list may take one of two forms:
631 (1) If it is just a host name, the appropriate global option (mysql_servers
632 or pgsql_servers) is searched for a host of the same name, and the
633 remaining parameters (database, user, password) are taken from there.
635 (2) If it contains any slashes, it is taken as a complete parameter set.
637 The list of servers is used in exactly the same was as the global list.
638 Once a connection to a server has happened and a query has been
639 successfully executed, processing of the lookup ceases.
641 This feature is intended for use in master/slave situations where updates
642 are occurring, and one wants to update a master rather than a slave. If the
643 masters are in the list for reading, you might have:
645 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
647 In an updating lookup, you could then write
649 ${lookup mysql{servers=master; UPDATE ...}
651 If, on the other hand, the master is not to be used for reading lookups:
653 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
655 you can still update the master by
657 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
659 11. The message_body_newlines option (default FALSE, for backwards
660 compatibility) can be used to control whether newlines are present in
661 $message_body and $message_body_end. If it is FALSE, they are replaced by
668 1. There is a new log selector called smtp_no_mail, which is not included in
669 the default setting. When it is set, a line is written to the main log
670 whenever an accepted SMTP connection terminates without having issued a
673 2. When an item in a dnslists list is followed by = and & and a list of IP
674 addresses, the behaviour was not clear when the lookup returned more than
675 one IP address. This has been solved by the addition of == and =& for "all"
676 rather than the default "any" matching.
678 3. Up till now, the only control over which cipher suites GnuTLS uses has been
679 for the cipher algorithms. New options have been added to allow some of the
680 other parameters to be varied.
682 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
683 set, Exim compiles a runtime option called disable_fsync.
685 5. There is a new variable called $smtp_count_at_connection_start.
687 6. There's a new control called no_pipelining.
689 7. There are two new variables called $sending_ip_address and $sending_port.
690 These are set whenever an SMTP connection to another host has been set up.
692 8. The expansion of the helo_data option in the smtp transport now happens
693 after the connection to the server has been made.
695 9. There is a new expansion operator ${rfc2047d: that decodes strings that
696 are encoded as per RFC 2047.
698 10. There is a new log selector called "pid", which causes the current process
699 id to be added to every log line, in square brackets, immediately after the
702 11. Exim has been modified so that it flushes SMTP output before implementing
703 a delay in an ACL. It also flushes the output before performing a callout,
704 as this can take a substantial time. These behaviours can be disabled by
705 obeying control = no_delay_flush or control = no_callout_flush,
706 respectively, at some earlier stage of the connection.
708 12. There are two new expansion conditions that iterate over a list. They are
709 called forany and forall.
711 13. There's a new global option called dsn_from that can be used to vary the
712 contents of From: lines in bounces and other automatically generated
713 messages ("delivery status notifications" - hence the name of the option).
715 14. The smtp transport has a new option called hosts_avoid_pipelining.
717 15. By default, exigrep does case-insensitive matches. There is now a -I option
718 that makes it case-sensitive.
720 16. A number of new features ("addresses", "map", "filter", and "reduce") have
721 been added to string expansions to make it easier to process lists of
722 items, typically addresses.
724 17. There's a new ACL modifier called "continue". It does nothing of itself,
725 and processing of the ACL always continues with the next condition or
726 modifier. It is provided so that the side effects of expanding its argument
729 18. It is now possible to use newline and other control characters (those with
730 values less than 32, plus DEL) as separators in lists.
732 19. The exigrep utility now has a -v option, which inverts the matching
735 20. The host_find_failed option in the manualroute router can now be set to
742 No new features were added to 4.66.
748 No new features were added to 4.65.
754 1. ACL variables can now be given arbitrary names, as long as they start with
755 "acl_c" or "acl_m" (for connection variables and message variables), are at
756 least six characters long, with the sixth character being either a digit or
759 2. There is a new ACL modifier called log_reject_target. It makes it possible
760 to specify which logs are used for messages about ACL rejections.
762 3. There is a new authenticator called "dovecot". This is an interface to the
763 authentication facility of the Dovecot POP/IMAP server, which can support a
764 number of authentication methods.
766 4. The variable $message_headers_raw provides a concatenation of all the
767 messages's headers without any decoding. This is in contrast to
768 $message_headers, which does RFC2047 decoding on the header contents.
770 5. In a DNS black list, if two domain names, comma-separated, are given, the
771 second is used first to do an initial check, making use of any IP value
772 restrictions that are set. If there is a match, the first domain is used,
773 without any IP value restrictions, to get the TXT record.
775 6. All authenticators now have a server_condition option.
777 7. There is a new command-line option called -Mset. It is useful only in
778 conjunction with -be (that is, when testing string expansions). It must be
779 followed by a message id; Exim loads the given message from its spool
780 before doing the expansions.
782 8. Another similar new command-line option is called -bem. It operates like
783 -be except that it must be followed by the name of a file that contains a
786 9. When an address is delayed because of a 4xx response to a RCPT command, it
787 is now the combination of sender and recipient that is delayed in
788 subsequent queue runs until its retry time is reached.
790 10. Unary negation and the bitwise logical operators and, or, xor, not, and
791 shift, have been added to the eval: and eval10: expansion items.
793 11. The variables $interface_address and $interface_port have been renamed
794 as $received_ip_address and $received_port, to make it clear that they
795 relate to message reception rather than delivery. (The old names remain
796 available for compatibility.)
798 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
799 to vary the message that is sent when an SMTP command is accepted.
805 1. There is a new Boolean option called filter_prepend_home for the redirect
808 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
809 start of receiving a non-SMTP message, before any of the message has been
812 3. When an SMTP error message is specified in a "message" modifier in an ACL,
813 or in a :fail: or :defer: message in a redirect router, Exim now checks the
814 start of the message for an SMTP error code.
816 4. There is a new parameter for LDAP lookups called "referrals", which takes
817 one of the settings "follow" (the default) or "nofollow".
819 5. Version 20070721.2 of exipick now included, offering these new options:
821 After all other sorting options have bee processed, reverse order
822 before displaying messages (-R is synonym).
824 Randomize order of matching messages before displaying.
826 Instead of displaying the matching messages, display the sum
828 --sort <variable>[,<variable>...]
829 Before displaying matching messages, sort the messages according to
830 each messages value for each variable.
832 Negate the value for every test (returns inverse output from the
833 same criteria without --not).
839 1. The ${readsocket expansion item now supports Internet domain sockets as well
840 as Unix domain sockets. If the first argument begins "inet:", it must be of
841 the form "inet:host:port". The port is mandatory; it may be a number or the
842 name of a TCP port in /etc/services. The host may be a name, or it may be an
843 IP address. An ip address may optionally be enclosed in square brackets.
844 This is best for IPv6 addresses. For example:
846 ${readsocket{inet:[::1]:1234}{<request data>}...
848 Only a single host name may be given, but if looking it up yield more than
849 one IP address, they are each tried in turn until a connection is made. Once
850 a connection has been made, the behaviour is as for ${readsocket with a Unix
853 2. If a redirect router sets up file or pipe deliveries for more than one
854 incoming address, and the relevant transport has batch_max set greater than
855 one, a batch delivery now occurs.
857 3. The appendfile transport has a new option called maildirfolder_create_regex.
858 Its value is a regular expression. For a maildir delivery, this is matched
859 against the maildir directory; if it matches, Exim ensures that a
860 maildirfolder file is created alongside the new, cur, and tmp directories.
866 The documentation is up-to-date for the 4.61 release. Major new features since
867 the 4.60 release are:
869 . An option called disable_ipv6, to disable the use of IPv6 completely.
871 . An increase in the number of ACL variables to 20 of each type.
873 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
874 $2, $3, (though those are still set) because the numeric variables get used
875 for other things in complicated expansions.
877 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
879 . It is possible to use setclassresources() on some BSD OS to control the
880 resources used in pipe deliveries.
882 . A new ACL modifier called add_header, which can be used with any verb.
884 . More errors are detectable in retry rules.
886 There are a number of other additions too.
892 The documentation is up-to-date for the 4.60 release. Major new features since
893 the 4.50 release are:
895 . Support for SQLite.
897 . Support for IGNOREQUOTA in LMTP.
899 . Extensions to the "submission mode" features.
901 . Support for Client SMTP Authorization (CSA).
903 . Support for ratelimiting hosts and users.
905 . New expansion items to help with the BATV "prvs" scheme.
907 . A "match_ip" condition, that matches an IP address against a list.
909 There are many more minor changes.
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