1 $Cambridge: exim/doc/doc-txt/NewStuff,v 1.65 2005/08/23 08:50:07 ph10 Exp $
6 This file contains descriptions of new features that have been added to Exim,
7 but have not yet made it into the main manual (which is most conveniently
8 updated when there is a relatively large batch of changes). The doc/ChangeLog
9 file contains a listing of all changes, including bug fixes.
14 TK/01 Added the "success_on_redirect" address verification option. When an
15 address generates new addresses during routing, Exim will abort
16 verification with "success" when more than one address has been
17 generated, but continue to verify a single new address. The latter
18 does not happen when the new "success_on_redirect" option is set, like
20 require verify = recipient/success_on_redirect/callout=10s
22 In that case, verification will succeed when a router generates a new
25 PH/01 Support for SQLite database lookups has been added. This is another
26 query-style lookup, but it is slightly different from the others because
27 a file name is required in addition to the SQL query. This is because an
28 SQLite database is a single file and there is no daemon as in other SQL
29 databases. The interface to Exim requires the name of the file, as an
30 absolute path, to be given at the start of the query. It is separated
31 from the query by white space. This means that the path name cannot
32 contain white space. Here is a lookup expansion example:
34 ${lookup sqlite {/some/thing/sqlitedb \
35 select name from aliases where id='ph10';}}
37 In a list, the syntax is similar. For example:
39 domainlist relay_domains = sqlite;/some/thing/sqlitedb \
40 select * from relays where ip='$sender_host_address';
42 The only character affected by the ${quote_sqlite: operator is a single
43 quote, which it doubles.
45 The SQLite library handles multiple simultaneous accesses to the database
46 internally. Multiple readers are permitted, but only one process can
47 update at once. Attempts to access the database while it is being updated
48 are rejected after a timeout period, during which the SQLite library
49 waits for the lock to be released. In Exim, the default timeout is set
50 to 5 seconds, but it can be changed by means of the sqlite_lock_timeout
53 Note that you must set LOOKUP_SQLITE=yes in Local/Makefile in order to
54 obtain SQLite support, and you will also need to add -lsqlite3 to the
55 EXTRALIBS setting. And of course, you have to install SQLite on your
58 PH/02 The variable $message_id is now deprecated, to be replaced by
59 $message_exim_id, which makes it clearer which ID is being referenced.
61 PH/03 The use of forbid_filter_existstest now also locks out the use of the
62 ${stat: expansion item.
64 PH/04 The IGNOREQUOTA extension to the LMTP protocol is now available in both
65 the lmtp transport and the smtp transport running in LMTP mode. In the
66 lmtp transport there is a new Boolean option called ignore_quota, and in
67 the smtp transport there is a new Boolean option called
68 lmtp_ignore_quota. If either of these options is set TRUE, the string
69 "IGNOREQUOTA" is added to RCPT commands when using the LMTP protocol,
70 provided that the server has advertised support for IGNOREQUOTA in its
71 response to the LHLO command.
73 PH/05 Previously, if "verify = helo" was set in an ACL, the condition was true
74 only if the host matched helo_try_verify_hosts, which caused the
75 verification to occur when the EHLO/HELO command was issued. The ACL just
76 tested the remembered result. Now, if a previous verification attempt has
77 not happened, "verify = helo" does it there and then.
79 PH/06 It is now possible to specify a port number along with a host name or
80 IP address in the list of hosts defined in the manualroute or
81 queryprogram routers, fallback_hosts, or the "hosts" option of the smtp
82 transport. These all override any port specification on the transport.
83 The relatively standard syntax of using a colon separator has been
84 adopted, but there are some gotchas that need attention:
86 * In all these lists of hosts, colon is the default separator, so either
87 the colon that specifies a port must be doubled, or the separator must
88 be changed. The following two examples have the same effect:
90 fallback_hosts = host1.tld::1225 : host2.tld::1226
91 fallback_hosts = <; host1.tld:1225 ; host2.tld:1226
93 * When IPv6 addresses are involved, it gets worse, because they contain
94 colons of their own. To make this case easier, it is permitted to
95 enclose an IP address (either v4 or v6) in square brackets if a port
96 number follows. Here's an example from a manualroute router:
98 route_list = * "</ [10.1.1.1]:1225 / [::1]:1226"
100 If the "/MX" feature is to be used as well as a port specifier, the port
101 must come last. For example:
103 route_list = * dom1.tld/mx::1225
105 PH/07 $smtp_command_argument is now set for all SMTP commands, not just the
106 non-message ones. This makes it possible to inspect the complete command
107 for RCPT commands, for example.
109 PH/08 The ${eval expansion now supports % as a "remainder" operator.
115 TF/01 Support for checking Client SMTP Authorization has been added. CSA is a
116 system which allows a site to advertise which machines are and are not
117 permitted to send email. This is done by placing special SRV records in
118 the DNS, which are looked up using the client's HELO domain. At this
119 time CSA is still an Internet-Draft.
121 Client SMTP Authorization checks are performed by the ACL condition
122 verify=csa. This will fail if the client is not authorized. If there is
123 a DNS problem, or if no valid CSA SRV record is found, or if the client
124 is authorized, the condition succeeds. These three cases can be
125 distinguished using the expansion variable $csa_status, which can take
126 one of the values "fail", "defer", "unknown", or "ok". The condition
127 does not itself defer because that would be likely to cause problems
128 for legitimate email.
130 The error messages produced by the CSA code include slightly more
131 detail. If $csa_status is "defer" this may be because of problems
132 looking up the CSA SRV record, or problems looking up the CSA target
133 address record. There are four reasons for $csa_status being "fail":
134 the client's host name is explicitly not authorized; the client's IP
135 address does not match any of the CSA target IP addresses; the client's
136 host name is authorized but it has no valid target IP addresses (e.g.
137 the target's addresses are IPv6 and the client is using IPv4); or the
138 client's host name has no CSA SRV record but a parent domain has
139 asserted that all subdomains must be explicitly authorized.
141 The verify=csa condition can take an argument which is the domain to
142 use for the DNS query. The default is verify=csa/$sender_helo_name.
144 This implementation includes an extension to CSA. If the query domain
145 is an address literal such as [192.0.2.95], or if it is a bare IP
146 address, Exim will search for CSA SRV records in the reverse DNS as if
147 the HELO domain was e.g. 95.2.0.192.in-addr.arpa. Therefore it is
148 meaningful to say, for example, verify=csa/$sender_host_address - in
149 fact, this is the check that Exim performs if the client does not say
150 HELO. This extension can be turned off by setting the main
151 configuration option dns_csa_use_reverse = false.
153 If a CSA SRV record is not found for the domain itself, then a search
154 is performed through its parent domains for a record which might be
155 making assertions about subdomains. The maximum depth of this search is
156 limited using the main configuration option dns_csa_search_limit, which
157 takes the value 5 by default. Exim does not look for CSA SRV records in
158 a top level domain, so the default settings handle HELO domains as long
159 as seven (hostname.five.four.three.two.one.com) which encompasses the
160 vast majority of legitimate HELO domains.
162 The dnsdb lookup also has support for CSA. Although dnsdb already
163 supports SRV lookups, this is not sufficient because of the extra
164 parent domain search behaviour of CSA, and (as with PTR lookups)
165 dnsdb also turns IP addresses into lookups in the reverse DNS space.
166 The result of ${lookup dnsdb {csa=$sender_helo_name} } has two
167 space-separated fields: an authorization code and a target host name.
168 The authorization code can be "Y" for yes, "N" for no, "X" for explicit
169 authorization required but absent, or "?" for unknown.
171 PH/01 The amount of output produced by the "make" process has been reduced,
172 because the compile lines are often rather long, making it all pretty
173 unreadable. The new style is along the lines of the 2.6 Linux kernel:
174 just a short line for each module that is being compiled or linked.
175 However, it is still possible to get the full output, by calling "make"
180 The value of FULLECHO defaults to "@", the flag character that suppresses
181 command reflection in "make". When you ask for the full output, it is
182 given in addition to the the short output.
184 TF/02 There have been two changes concerned with submission mode:
186 Until now submission mode always left the return path alone, whereas
187 locally-submitted messages from untrusted users have the return path
188 fixed to the user's email address. Submission mode now fixes the return
189 path to the same address as is used to create the Sender: header. If
190 /sender_retain is specified then both the Sender: header and the return
193 Note that the changes caused by submission mode take effect after the
194 predata ACL. This means that any sender checks performed before the
195 fix-ups will use the untrusted sender address specified by the user, not
196 the trusted sender address specified by submission mode. Although this
197 might be slightly unexpected, it does mean that you can configure ACL
198 checks to spot that a user is trying to spoof another's address, for
201 There is also a new /name= option for submission mode which allows you
202 to specify the user's full name to be included in the Sender: header.
205 accept authenticated = *
206 control = submission/name=${lookup {$authenticated_id} \
207 lsearch {/etc/exim/namelist} }
209 The namelist file contains entries like
213 And the resulting Sender: header looks like
215 Sender: Tony Finch <fanf@exim.org>
217 TF/03 The control = fakereject ACL modifier now has a fakedefer counterpart,
218 which works in exactly the same way except it causes a fake SMTP 450
219 response after the message data instead of a fake SMTP 550 response.
220 You must take care when using fakedefer because it will cause messages
221 to be duplicated when the sender retries. Therefore you should not use
222 fakedefer if the message will be delivered normally.
224 TF/04 There is a new ratelimit ACL condition which can be used to measure
225 and control the rate at which clients can send email. This is more
226 powerful than the existing smtp_ratelimit_* options, because those
227 options only control the rate of commands in a single SMTP session,
228 whereas the new ratelimit condition works across all connections
229 (concurrent and sequential) to the same host.
231 The syntax of the ratelimit condition is:
233 ratelimit = <m> / <p> / <options> / <key>
235 If the average client sending rate is less than m messages per time
236 period p then the condition is false, otherwise it is true.
238 The parameter p is the smoothing time constant, in the form of an Exim
239 time interval e.g. 8h for eight hours. A larger time constant means it
240 takes Exim longer to forget a client's past behaviour. The parameter m is
241 the maximum number of messages that a client can send in a fast burst. By
242 increasing both m and p but keeping m/p constant, you can allow a client
243 to send more messages in a burst without changing its overall sending
244 rate limit. Conversely, if m and p are both small then messages must be
245 sent at an even rate.
247 The key is used to look up the data used to calcluate the client's
248 average sending rate. This data is stored in a database maintained by
249 Exim in its spool directory alongside the retry database etc. For
250 example, you can limit the sending rate of each authenticated user,
251 independent of the computer they are sending from, by setting the key
252 to $authenticated_id. The default key is $sender_host_address.
253 Internally, Exim includes the smoothing constant p and the options in
254 the lookup key because they alter the meaning of the stored data.
255 This is not true for the limit m, so you can alter the configured
256 maximum rate and Exim will still remember clients' past behaviour,
257 but if you alter the other ratelimit parameters Exim will effectively
258 forget their past behaviour.
260 Each ratelimit condition can have up to two options. The first option
261 specifies what Exim measures the rate of, and the second specifies how
262 Exim handles excessively fast clients.
264 The per_mail option means that it measures the client's rate of sending
265 messages. This is the default if none of the per_* options is specified.
267 The per_conn option means that it measures the client's connection rate.
269 The per_byte option limits the sender's email bandwidth. Note that it
270 is best to use this option in the DATA ACL; if it is used in an earlier
271 ACL it relies on the SIZE parameter on the MAIL command, which may be
272 inaccurate or completely missing. You can follow the limit m in the
273 configuration with K, M, or G to specify limits in kilobytes,
274 megabytes, or gigabytes respectively.
276 The per_cmd option means that Exim recomputes the rate every time the
277 condition is processed, which can be used to limit the SMTP command rate.
278 The alias per_rcpt is provided for use in the RCPT ACL instead of per_cmd
279 to make it clear that the effect is to limit the rate at which recipients
280 are accepted. Note that in this case the rate limiting engine will see a
281 message with many recipients as a large high-speed burst.
283 If a client's average rate is greater than the maximum, the rate
284 limiting engine can react in two possible ways, depending on the
285 presence of the strict or leaky options. This is independent of the
286 other counter-measures (e.g. rejecting the message) that may be
287 specified by the rest of the ACL. The default mode is leaky, which
288 avoids a sender's over-aggressive retry rate preventing it from getting
291 The strict option means that the client's recorded rate is always
292 updated. The effect of this is that Exim measures the client's average
293 rate of attempts to send email, which can be much higher than the
294 maximum. If the client is over the limit it will be subjected to
295 counter-measures until it slows down below the maximum rate.
297 The leaky option means that the client's recorded rate is not updated
298 if it is above the limit. The effect of this is that Exim measures the
299 client's average rate of successfully sent email, which cannot be
300 greater than the maximum. If the client is over the limit it will
301 suffer some counter-measures, but it will still be able to send email
302 at the configured maximum rate, whatever the rate of its attempts.
304 As a side-effect, the ratelimit condition will set the expansion
305 variables $sender_rate containing the client's computed rate,
306 $sender_rate_limit containing the configured value of m, and
307 $sender_rate_period containing the configured value of p.
309 Exim's other ACL facilities are used to define what counter-measures
310 are taken when the rate limit is exceeded. This might be anything from
311 logging a warning (e.g. while measuring existing sending rates in order
312 to define our policy), through time delays to slow down fast senders,
313 up to rejecting the message. For example,
315 # Log all senders' rates
317 ratelimit = 0 / 1h / strict
319 Sender rate $sender_rate > $sender_rate_limit / $sender_rate_period
321 # Slow down fast senders
323 ratelimit = 100 / 1h / per_rcpt / strict
324 delay = ${eval: 10 * ($sender_rate - $sender_rate_limit) }
326 # Keep authenticated users under control
328 ratelimit = 100 / 1d / strict / $authenticated_id
330 # System-wide rate limit
332 message = Sorry, too busy. Try again later.
333 ratelimit = 10 / 1s / $primary_hostname
335 # Restrict incoming rate from each host, with a default rate limit
336 # set using a macro and special cases looked up in a table.
338 message = Sender rate $sender_rate exceeds \
339 $sender_rate_limit messages per $sender_rate_period
340 ratelimit = ${lookup {$sender_host_address} \
341 cdb {DB/ratelimits.cdb} \
342 {$value} {RATELIMIT} }
344 Warning: if you have a busy server with a lot of ratelimit tests,
345 especially with the per_rcpt option, you may suffer from a performance
346 bottleneck caused by locking on the ratelimit hints database. Apart from
347 making your ACLs less complicated, you can reduce the problem by using a
348 RAM disk for Exim's hints directory, /var/spool/exim/db/. However this
349 means that Exim will lose its hints data after a reboot (including retry
350 hints, the callout cache, and ratelimit data).
352 TK/01 Added an 'spf' lookup type that will return an SPF result for a given
353 email address (the key) and an IP address (the database):
355 ${lookup {tom@duncanthrax.net} spf{217.115.139.137}}
357 The lookup will return the same result strings as they can appear in
358 $spf_result (pass,fail,softfail,neutral,none,err_perm,err_temp). The
359 lookup is armored in EXPERIMENTAL_SPF. Currently, only IPv4 addresses
362 Patch submitted by Chris Webb <chris@arachsys.com>.
364 PH/02 There's a new verify callout option, "fullpostmaster", which first acts
365 as "postmaster" and checks the recipient <postmaster@domain>. If that
366 fails, it tries just <postmaster>, without a domain, in accordance with
367 the specification in RFC 2821.
369 PH/03 The action of the auto_thaw option has been changed. It no longer applies
370 to frozen bounce messages.
372 TK/02 There are two new expansion items to help with the implementation of
373 the BATV "prvs" scheme in an Exim configuration:
376 ${prvs {<ADDRESS>}{<KEY>}{[KEYNUM]}}
378 The "prvs" expansion item takes three arguments: A qualified RFC2821
379 email address, a key and an (optional) key number. All arguments are
380 expanded before being used, so it is easily possible to lookup a key
381 and key number using the address as the lookup key. The key number is
382 optional and defaults to "0". The item will expand to a "prvs"-signed
383 email address, to be typically used with the "return_path" option on
384 a smtp transport. The decision if BATV should be used with a given
385 sender/recipient pair should be done on router level, to avoid having
386 to set "max_rcpt = 1" on the transport.
389 ${prvscheck {<ADDRESS>}{<SECRET>}{<RETURN_STRING>}}
391 The "prvscheck" expansion item takes three arguments. Argument 1 is
392 expanded first. When the expansion does not yield a SYNTACTICALLY
393 valid "prvs"-scheme address, the whole "prvscheck" item expands to
394 the empty string. If <ADDRESS> is a "prvs"-encoded address after
395 expansion, two expansion variables are set up:
397 $prvscheck_address Contains the "prvs"-decoded version of
398 the address from argument 1.
400 $prvscheck_keynum Contains the key number extracted from
401 the "prvs"-address in argument 1.
403 These two variables can be used in the expansion code of argument 2
404 to retrieve the <SECRET>. The VALIDITY of the "prvs"-signed address
405 is then checked. The result is stored in yet another expansion
408 $prvscheck_result Contains the result of a "prvscheck"
409 expansion: Unset (the empty string) for
410 failure, "1" for success.
412 The "prvscheck" expansion expands to the empty string if <ADDRESS>
413 is not a SYNTACTICALLY valid "prvs"-scheme address. Otherwise,
414 argument 3 defines what "prvscheck" expands to: If argument 3
415 is the empty string, "prvscheck" expands to the decoded version
416 of the address (no matter if it is CRYPTOGRAPHICALLY valid or not).
417 If argument 3 expands to a non-empty string, "prvscheck" expands
426 PRVSCHECK_SQL = ${lookup mysql{SELECT secret FROM batv_prvs WHERE \
427 sender='${quote_mysql:$prvscheck_address}'}{$value}}
431 # Bounces: drop unsigned addresses for BATV senders
432 deny message = This address does not send an unsigned reverse path.
434 recipients = +batv_recipients
436 # Bounces: In case of prvs-signed address, check signature.
437 deny message = Invalid reverse path signature.
439 condition = ${prvscheck {$local_part@$domain}{PRVSCHECK_SQL}{1}}
440 !condition = $prvscheck_result
446 data = ${prvscheck {$local_part@$domain}{PRVSCHECK_SQL}{}}
448 Transport (referenced by router that makes decision if
453 return_path = ${prvs {$return_path} \
454 {${lookup mysql{SELECT \
455 secret FROM batv_prvs WHERE \
456 sender='${quote_mysql:$sender_address}'} \
459 PH/04 There are two new options that control the retrying done by the daemon
460 at startup when it cannot immediately bind a socket (typically because
461 the socket is already in use). The default values reproduce what were
462 built-in constants previously: daemon_startup_retries defines the number
463 of retries after the first failure (default 9); daemon_startup_sleep
464 defines the length of time to wait between retries (default 30s).
466 PH/05 There is now a new ${if condition called "match_ip". It is similar to
467 match_domain, etc. It must be followed by two argument strings. The first
468 (after expansion) must be an IP address or an empty string. The second
469 (after expansion) is a restricted host list that can match only an IP
470 address, not a host name. For example:
472 ${if match_ip{$sender_host_address}{1.2.3.4:5.6.7.8}{...}{...}}
474 The specific types of host list item that are permitted in the list are
475 shown below. Consult the manual section on host lists for further
478 . An IP address, optionally with a CIDR mask.
480 . A single asterisk matches any IP address.
482 . An empty item matches only if the IP address is empty. This could be
483 useful for testing for a locally submitted message or one from specific
484 hosts in a single test such as
486 ${if match_ip{$sender_host_address}{:4.3.2.1:...}{...}{...}}
488 where the first item in the list is the empty string.
490 . The item @[] matches any of the local host's interface addresses.
492 . Lookups are assumed to be "net-" style lookups, even if "net-" is not
493 specified. Thus, the following are equivalent:
495 ${if match_ip{$sender_host_address}{lsearch;/some/file}...
496 ${if match_ip{$sender_host_address}{net-lsearch;/some/file}...
498 You do need to specify the "net-" prefix if you want to specify a
499 specific address mask, for example, by using "net24-".
501 PH/06 The "+all" debug selector used to set the flags for all possible output;
502 it is something that people tend to use semi-automatically when
503 generating debug output for me or for the list. However, by including
504 "+memory", an awful lot of output that is very rarely of interest was
505 generated. I have changed this so that "+all" no longer includes
506 "+memory". However, "-all" still turns everything off.
512 PH/01 The format in which GnuTLS parameters are written to the gnutls-param
513 file in the spool directory has been changed. This change has been made
514 to alleviate problems that some people had with the generation of the
515 parameters by Exim when /dev/random was exhausted. In this situation,
516 Exim would hang until /dev/random acquired some more entropy.
518 The new code exports and imports the DH and RSA parameters in PEM
519 format. This means that the parameters can be generated externally using
520 the certtool command that is part of GnuTLS.
522 To replace the parameters with new ones, instead of deleting the file
523 and letting Exim re-create it, you can generate new parameters using
524 certtool and, when this has been done, replace Exim's cache file by
525 renaming. The relevant commands are something like this:
529 # chown exim:exim new.params
530 # chmod 0400 new.params
531 # certtool --generate-privkey --bits 512 >new.params
532 # echo "" >>new.params
533 # certtool --generate-dh-params --bits 1024 >> new.params
534 # mv new.params params
536 If Exim never has to generate the parameters itself, the possibility of
539 PH/02 A new expansion item for dynamically loading and calling a locally-
540 written C function is now provided, if Exim is compiled with
544 set in Local/Makefile. The facility is not included by default (a
545 suitable error is given if you try to use it when it is not there.)
547 If you enable EXPAND_DLFUNC, you should also be aware of the new redirect
548 router option forbid_filter_dlfunc. If you have unprivileged users on
549 your system who are permitted to create filter files, you might want to
550 set forbid_filter_dlfunc=true in the appropriate router, to stop them
551 using ${dlfunc to run code within Exim.
553 You load and call an external function like this:
555 ${dlfunc{/some/file}{function}{arg1}{arg2}...}
557 Once loaded, Exim remembers the dynamically loaded object so that it
558 doesn't reload the same object file in the same Exim process (but of
559 course Exim does start new processes frequently).
561 There may be from zero to eight arguments to the function. When compiling
562 a local function that is to be called in this way, local_scan.h should be
563 included. The Exim variables and functions that are defined by that API
564 are also available for dynamically loaded functions. The function itself
565 must have the following type:
567 int dlfunction(uschar **yield, int argc, uschar *argv[])
569 Where "uschar" is a typedef for "unsigned char" in local_scan.h. The
570 function should return one of the following values:
572 OK Success. The string that is placed in "yield" is put into
573 the expanded string that is being built.
575 FAIL A non-forced expansion failure occurs, with the error
576 message taken from "yield", if it is set.
578 FAIL_FORCED A forced expansion failure occurs, with the error message
579 taken from "yield" if it is set.
581 ERROR Same as FAIL, except that a panic log entry is written.
583 When compiling a function that is to be used in this way with gcc,
584 you need to add -shared to the gcc command. Also, in the Exim build-time
585 configuration, you must add -export-dynamic to EXTRALIBS.
587 TF/01 $received_time is a new expansion variable containing the time and date
588 as a number of seconds since the start of the Unix epoch when the
589 current message was received.
591 PH/03 There is a new value for RADIUS_LIB_TYPE that can be set in
592 Local/Makefile. It is RADIUSCLIENTNEW, and it requests that the new API,
593 in use from radiusclient 0.4.0 onwards, be used. It does not appear to be
594 possible to detect the different versions automatically.
596 PH/04 There is a new option called acl_not_smtp_mime that allows you to scan
597 MIME parts in non-SMTP messages. It operates in exactly the same way as
600 PH/05 It is now possible to redefine a macro within the configuration file.
601 The macro must have been previously defined within the configuration (or
602 an included file). A definition on the command line using the -D option
603 causes all definitions and redefinitions within the file to be ignored.
604 In other words, -D overrides any values that are set in the file.
605 Redefinition is specified by using '==' instead of '='. For example:
609 MAC1 == updated value
611 Redefinition does not alter the order in which the macros are applied to
612 the subsequent lines of the configuration file. It is still the same
613 order in which the macros were originally defined. All that changes is
614 the macro's value. Redefinition makes it possible to accumulate values.
619 MAC1 == MAC1 and something added
621 This can be helpful in situations where the configuration file is built
622 from a number of other files.
624 PH/06 Macros may now be defined or redefined between router, transport,
625 authenticator, or ACL definitions, as well as in the main part of the
626 configuration. They may not, however, be changed within an individual
627 driver or ACL, or in the local_scan, retry, or rewrite sections of the
630 PH/07 $acl_verify_message is now set immediately after the failure of a
631 verification in an ACL, and so is available in subsequent modifiers. In
632 particular, the message can be preserved by coding like this:
634 warn !verify = sender
635 set acl_m0 = $acl_verify_message
637 Previously, $acl_verify_message was set only while expanding "message"
638 and "log_message" when a very denied access.
640 PH/08 The redirect router has two new options, sieve_useraddress and
641 sieve_subaddress. These are passed to a Sieve filter to specify the :user
642 and :subaddress parts of an address. Both options are unset by default.
643 However, when a Sieve filter is run, if sieve_useraddress is unset, the
644 entire original local part (including any prefix or suffix) is used for
645 :user. An unset subaddress is treated as an empty subaddress.
647 PH/09 Quota values can be followed by G as well as K and M.
649 PH/10 $message_linecount is a new variable that contains the total number of
650 lines in the header and body of the message. Compare $body_linecount,
651 which is the count for the body only. During the DATA and
652 content-scanning ACLs, $message_linecount contains the number of lines
653 received. Before delivery happens (that is, before filters, routers, and
654 transports run) the count is increased to include the Received: header
655 line that Exim standardly adds, and also any other header lines that are
656 added by ACLs. The blank line that separates the message header from the
657 body is not counted. Here is an example of the use of this variable in a
660 deny message = Too many lines in message header
662 ${if <{250}{${eval: $message_linecount - $body_linecount}}}
664 In the MAIL and RCPT ACLs, the value is zero because at that stage the
665 message has not yet been received.
667 PH/11 In a ${run expansion, the variable $value (which contains the standard
668 output) is now also usable in the "else" string.
670 PH/12 In a pipe transport, although a timeout while waiting for the pipe
671 process to complete was treated as a delivery failure, a timeout while
672 writing the message to the pipe was logged, but erroneously treated as a
673 successful delivery. Such timeouts include transport filter timeouts. For
674 consistency with the overall process timeout, these timeouts are now
675 treated as errors, giving rise to delivery failures by default. However,
676 there is now a new Boolean option for the pipe transport called
677 timeout_defer, which, if set TRUE, converts the failures into defers for
678 both kinds of timeout. A transport filter timeout is now identified in
685 The documentation is up-to-date for the 4.50 release.
git://git.exim.org / exim.git / blob