4 This Wish List is now obsolete. The items it contains have been imported into
5 the Exim Bugzilla, which is where all new wishes should be added. This file is
6 no longer maintained. Some day it should be deleted.
9 ===============================================================================
10 Even when it was first released, Exim 4 had a Wish List because not all the
11 things suggested for it were implemented. The list has not stopped growing...
13 Another reason it is so long is that I have retained some items from the Exim 3
14 Wish List that never got implemented, but which seem reasonable possibilities
15 for later addition to Exim 4.
17 I have guessed at the amount of work involved, and categorized the items as
18 Tiny, Small, Medium, Large, or Unknown. The guesses are not based on any
19 detailed investigation, so must be taken as very rough.
22 ------------------------------------------------------------------------------
23 ------------------------------------------------------------------------------
24 ----- Retained from the Exim 3 Wish List ------
25 ------------------------------------------------------------------------------
26 ------------------------------------------------------------------------------
28 (10) 13-Jul-98 M more flexibility for pipe returns
31 The ability to specify more precisely what happens concerning the return code
32 from the pipe and the presence/absence of STDOUT/STDERR is requested. The
33 particular configuration that was requested was:
35 > if the command exited EX_OK, *and* produced nothing on STDOUT or
36 > STDERR, it succeeded...
37 > if the command exited EX_TEMPFAIL, defer, regardless of
39 > otherwise freeze the message (this will get my attention by way of
40 > freeze_tell_mailmaster)...
41 ------------------------------------------------------------------------------
43 (11) 17-Jul-98 G support for DSN
46 It is unclear to me how this should work in the presence of aliases and
47 forwarding. Local deliveries would have to explicitly configured as deliveries
48 or relaying or whatever. A substantial amount of code is probably needed.
51 I have nothing to add except to say that for many of the reasons you've
52 stated, I don't think that DSN is coherent enough to be worth the effort
57 I thought the RFC was pretty clear on this. In a nutshell, if the
58 delivery rewrites the envelope from address, it's considered a
59 terminal delivery (i.e. delivery to a mailing list exploder), otherwise
60 treat it as a forwarding operation (the /etc/aliases case). I would
61 treat a .forward expansion as a final delivery event (it got to the
62 user as far as the MTA is concerned).
64 Yes, we need the DSN syntax. We also require the complete semantics of
65 NOTIFY=SUCCESS,FAILURE for our application to work.
67 Electronic Bill Presentment is really going to push the need for
68 DSN support in MTAs. We just don't want to get stuck in a situation
69 where we're faced with a non-DSN-aware MTA when we go to install
70 our bill/statement engine, thus our interest in what the MTA vendors
71 are planning to do about DSN.
72 ------------------------------------------------------------------------------
74 (41) 14-Oct-98 M Find a way of modifying header lines
77 The problem with header_remove followed by header_add is that you can't refer
78 to the previous value of the header when adding a replacement. This could be
79 solved with a replace_header option. See also Exim 4/333.
80 ------------------------------------------------------------------------------
82 (43) 15-Oct-98 M Sender rewrite *after* SMTP incoming checks
85 The anti-relaying check happens after the sender has been rewritten; there are
86 times when it would be helpful to do the check on the original sender, not on
87 the rewritten one. Quite how to configure this I'm not sure.
89 A related suggestion (from Steve Sargent) is to retain the original sender
90 address and make it accessible somehow.
91 ------------------------------------------------------------------------------
93 (46) 20-Oct-98 L SMTP protocol hooks
96 "But there are enough broken SMTP implementations to make me wonder whether
97 there isn't a case for providing hooks for tweaking the SMTP transport's
98 protocol exchange. Something which would allow me to say things like 'if, when
99 talking to lame.example.com, you get a 251 response to a MAIL command, rewrite
100 the response to 501 before continuing'."
101 ------------------------------------------------------------------------------
103 (50) 13-Nov-98 M A "Focus" option for eximon
106 This is the opposite of "Hide"; it just displays a certain subset. Hmm. Could
107 something clever be done with regular expressions?
108 ------------------------------------------------------------------------------
110 (61) 22-Dec-98 M Send failed error messages to somebody
113 With sendmail, the failed error message is made into a error message,
114 with both envelope sender and recipient set to MAILER-DAEMON. The
115 original, bogus-envelope-sender message is then available to whoever
116 receives MAILER-DAEMON's mail. A more flexible approach would be to
117 specify a specific recipient.
118 ------------------------------------------------------------------------------
120 (81) 01-Mar-99 M Addition of Content-MD5 support
123 Martin supplied a suggested patch at
124 http://www.net.lut.ac.uk/~martin/antispam/exim-hacks/
125 ------------------------------------------------------------------------------
127 (85) 15-Mar-99 M ability to rewrite addresses in non-standard headers
131 Such as "return-receipt-to". See also 41. See also Exim 4/333.
132 ------------------------------------------------------------------------------
134 (90) 21-Apr-99 M change wild prefix/suffix greediness
137 Currently, when prefix or suffix containing * is set on a director, and the
138 fixed part occurs more than once in a local part, the length of the prefix or
139 suffix is maximized. For example, with suffix = -* and a local part of
140 foo-bar-baz the suffix is taken as bar-baz, leaving the local part as foo.
141 An option is proposed to invert this rule.
142 ------------------------------------------------------------------------------
144 (91) 26-Apr-99 S make queue_run_in_order to newest first
145 "Andreas M. Kirchwitz"
147 The tidiest thing would be to have queue_run_order={random,oldest,newest},
148 and make queue_run_in_order obsolete.
149 ------------------------------------------------------------------------------
151 (93) 04-May-1999 L fallback_transport
153 This would be a generic transport option, specifying a different transport to
154 be used if the first one failed. Failed hard, or failed soft? Or an option?
155 And if failed hard, is a bounce message sent as well, or not? There are uid
156 issues. Remote delivery would have to be done always in a subprocess so that
157 the main process could retain privilege in case the fallback transport was
158 local. That could be conditional. That's why this is labelled "Large". Some of
159 the things people want to do with this can be done by variations in the
160 routers, e.g. use $message_age to switch routers.
161 ------------------------------------------------------------------------------
163 (94) 13-May-1999 M message to go with -Mg
167 So the admin can pass back a reason.
168 ------------------------------------------------------------------------------
170 (99) 28-May-1999 M header to list failures for syntax_errors_to
173 "I use the syntax_errors_to feature to email a copy of the error message.
174 It would be helpful to have the X-Failed-Receipients header in there,
175 identifying which addreses(s) are the problem, so that I don't have to
176 parse the body of the email message to figure out which addresses."
177 ------------------------------------------------------------------------------
179 (100) 04-Jun-1999 S admin_users option, like trusted_users
181 ------------------------------------------------------------------------------
183 (102) 21-Jun-1999 M expanded basic variables
186 Oh, and a wishlist entry, qualify_domain, and preferably other variables
187 can be set with a $lookup in the first part of the exim configuration
188 file, perhaps by an equivalent to backticks in shell script ("`command`")?
189 ------------------------------------------------------------------------------
191 (105) 28-Jun-1999 M MIME-format bounce messages
194 "Is there any work going/gone on/planned to enable exim to report delivery
195 status notifications using RFC1892 multipart/report MIME messages? It would be
196 great to have errors reported in a message/rfc822 attachment."
199 "I like plain bounces, so would hope that if you do this, that it be
200 configurable. I think that even for those who want it, it shouldn't be very
201 high on the wish list priority."
203 Other suggestions: toggle for bounces/warnings; override max_return for
204 certain addresses; use plain text if original not MIME. See Paul's hack
205 for background of what to do.
207 Nigel suggests using a specially named autoreply transport to generate bounces;
208 people could then replace this with another transport (e.g. pipe) if they want
209 to customize it themselves.
211 Eli Chen posted an unconditional patch for 3.32 that does some of this work.
212 That could form a basis.
213 ------------------------------------------------------------------------------
215 (107) 12-Jul-1999 S defer transport at given load level
218 ------------------------------------------------------------------------------
220 (108) 16-Jul-1999 S remote sort by numbers of recipients
223 In the absence of remote_sort, sort remote domains by the number of recipients
225 ------------------------------------------------------------------------------
227 (114) 11-Nov-1999 S List of possible outgoing interfaces
229 Allow the smtp "interface" option to be a list: try them in turn until one
230 is found to work. Also allow masks to specify a range of addresses.
231 ------------------------------------------------------------------------------
233 (123) 23-Dec-1999 L Use AUTH + TURN for dial-in hosts
236 The way to do this would be to have Exim deliver messages into per-host
237 directories in, say, BSMTP format. Accept TURN if authenticated, and cause it
238 to run a helper program that is passed the socket in order to deliver the mail.
239 Provide a helper program!
240 ------------------------------------------------------------------------------
242 (125) 04-Jan-2000 L Use shared memory segment for queue list
245 The idea is that a queue-runner that finds no existing shared segment should
246 create one (if configured - possibly some fixed size) and all Exim processes
247 should maintain a list of messages in it, thereby saving on directory scans
248 when there are lots of messages. This needs a lot of careful thought to try to
249 eliminate any possibility of data loss. The interlocking could be quite tricky.
250 Further posters suggested using a db file to hold the list. See also 127.
251 ------------------------------------------------------------------------------
253 (129) 14-Jan-2000 L Dynamically loadable lookup modules
256 Suggested patch provided.
257 ------------------------------------------------------------------------------
259 (131) 17-Jan-2000 T Facility for assuming existence for EACCES
262 The opposite option for "+" in require_files: assume existence if cannot
263 peer into the directory (+ assumes non-existence).
264 ------------------------------------------------------------------------------
266 (131) 29-Feb-2000 M? Control total number of outgoing SMTP calls
269 This is for hosts with slow connections. Could some modification of
270 serialize_hosts be used for this? Or maybe use a semaphore? They seem to
271 be quite widely available.
272 ------------------------------------------------------------------------------
274 (132) 01-Mar-2000 S Lookup host name from outgoing interface
277 Instead of primary_hostname, look up the name for the interface that is being
278 used for sending. Suggested patch supplied, but this should be an option of the
280 ------------------------------------------------------------------------------
282 (133) 06-Mar-2000 S Filter option not to log "previously sent"
285 This is when using the "log" option of the autoreply driver.
286 ------------------------------------------------------------------------------
288 (134) 09-Mar-2000 S Option to remove attachments when bouncing
289 ------------------------------------------------------------------------------
291 (136) 13-Mar-2000 S/M Option for aliasfile to suppress "me too"
293 Could be tricky determining who "me" is.
294 ------------------------------------------------------------------------------
296 (143) 08-May-2000 S Make quota_warn_threshold into a list
299 So several warnings could be generated as the mailbox got bigger and bigger.
300 ------------------------------------------------------------------------------
302 (148) 15-May-2000 S Warn recipient if message rejected for quota excession.
305 Maybe not all that small, because the possibility of retrying must be taken
307 ------------------------------------------------------------------------------
309 (149) 19-May-2000 L Make added headers visible in filters and other places
312 Headers added by directors/routers are not visible in subsequent processing.
313 This is a request to make them visible. What about removed headers? This could
314 be tricky to specify, hence the L.
316 A separate but related issue is the effect of headers added by "unseen"
317 directors. These are documented in chapter 19 as not being accumulated. Should
318 any change be made? See also Exim 4/333.
319 ------------------------------------------------------------------------------
321 (155) 16-Jun-2000 M Special handling for certain hosts
324 A means of changing the transport depending on the host name/IP of the most
325 preferred MX record so that all domains that route to certain hosts can be
326 handled specially. Maybe this could be a variable that is available in the
327 expansion of the "transport" option.
328 ------------------------------------------------------------------------------
330 (158) 29-Jun-2000 S Configure "From" in bounces
334 ------------------------------------------------------------------------------
336 (159) 07-Jul-2000 M Keep messages for fixed time
339 An option to keep messages on the queue for a specified time, even if all their
340 destination hosts have timed out.
341 ------------------------------------------------------------------------------
343 (164) 17-Aug-2000 S sender_unqualified_auth_hosts
345 To allow authenticated hosts to send unqualified addresses. Presumably it
346 needs received_... as well.
347 ------------------------------------------------------------------------------
349 (167) 05-Sep-2000 L Support for ODBC
351 This would allow access to databases that don't have native support built into
352 Exim. See http://www.openlinksw.com/info/docs/rel3doc/unix/odbcsdk.htm
353 ------------------------------------------------------------------------------
355 (168) 06-Sep-2000 M Deliver messages that alias to nothing to a given address
358 If other people are managing alias lists, and one is empty, bounce that
359 delivery to a given address rather than freezing the message. Use the errors_to
361 ------------------------------------------------------------------------------
363 (173) 18-Sep-2000 S A way of doing lsearches with EOL terminated keys
366 This is for looking up things like subject contents. Probably need an option to
367 exim_dbmbuild to make them into DBM files.
368 ------------------------------------------------------------------------------
370 (181) 10-Nov-2000 S Compile-time options for ignoring Sendmail options
372 So that new ones could be accommodated easily.
373 ------------------------------------------------------------------------------
375 (183) 04-Dec-2000 L dns_means_nonexist_after
378 In other words, wait a bit before giving up. This needs a mechanism for
379 remembering, which is not currently available. To be borne in mind for the
381 ------------------------------------------------------------------------------
383 (184) 04-Dec-2000 M Log more details of local caller
386 "I was wondering if it was possible for exim to log the parent pid's cwd and
387 exe when it is called from a script/invoked by actually running /usr/sbin/exim
388 or /usr/sbin/sendmail." Question: is this information actually/easily
389 available to Exim? Needs investigation.
390 ------------------------------------------------------------------------------
392 (186) 19-Dec-2000 S A simple utility to reset a retry time
395 Basically, to do what exim_fixdb "delete" can do, but straightforwardly. There
396 could be an interface from eximon.
397 ------------------------------------------------------------------------------
399 (187) 02-Jan-2001 M Wildcarding in headers_remove
402 What I'd like to see is it to handle globs (or regexps, but i'm not sure this
403 latter would worth the hassle), in a way like:
405 headers_remove = "X-*:Additional-header"
406 ------------------------------------------------------------------------------
408 (190) 03-Jan-2001 M Multiple message operations in eximon
409 ------------------------------------------------------------------------------
411 (195) 19-Mar-2001 T TCP window size
413 TCP window size for receiving/sending, SMTP client/server.
414 ------------------------------------------------------------------------------
415 ------------------------------------------------------------------------------
419 ------------------------------------------------------------------------------
420 ------------------------------------------------------------------------------
421 ----- Things that didn't make it into Exim 4 ------
422 ------------------------------------------------------------------------------
423 ------------------------------------------------------------------------------
425 . An option to send messages to postmaster when ignore_errmsg_errors_after
428 . When an address is being routed, its constituents are in $local_part and
429 $domain, but there is currently no variable that contains the whole thing. It
430 could be put into $recipient, but that risks confusion with $recipients
431 (which is available in system filters). Maybe $address could be used?
433 . The ability to relay to host X without knowing all the domains that host X
434 might have. At ACL time, one would need to verify the recipient, and determine
435 that it routed to host X.
437 . People want to change the wording of messages; can we find an efficient way
438 of allowing this? (Maybe put all messages into a separate module?) The problem
439 is not in the messages themselves, but in the values that get inserted into
440 messages. Would have to invent a new kind of function that used identified
441 values rather than positional ones. Use GNU gettext?
443 . Invent lf_hosts for those that may use LF without CR. Any other RFC
444 things we need to worry about?
446 . A user would really like to see something similar, perhaps with
447 "ID=$authenticated_id", similar to "helo=" and "ident=" in the default received
448 header. BUT there are security issues. Maybe give it as a commented out option
449 in the default configuration?
451 . Consider expanding further options that take integer values. What about
452 smtp_xxx options for different limits at different times of day (for example)?
453 What about tls_advertise_hosts (so can look at incoming IP/port)?
455 . How about a "hold hosts" option (cf hold_domains) to hold delivery to certain
458 . Allow user filters to use "headers add", but probably not remove. Or maybe
459 just implement "allow" options for both of these features.
461 . Have the return from pipe in a variable, so that (e.g. error_message_file)
464 . Implement randomize for ldap/sql servers.
466 . Add an option for ETRN that says "wait for the command to finish, and use its
467 stdout as the SMTP response." // A serialized ETRN now does the waiting, but
468 there is as yet no way to use the status. //
470 . -odsomething for "ignore retry when doing immediate delivery".
472 . Add an option to the smtp transport to make it treat 5xx on connection as if
473 it were 4xx. Or possible add a sophisticated "after command X, treat xxx as
476 . Global option to enable initgroups() for exim uid. Default off.
478 . When verifying a sender, should it be rewritten with any T rewrites, because
479 it would be so rewritten if it actually was a recipient in a message?
481 . Sean Witham wants a way of defining macros that are not privileged, and a
482 sort of #ifdef structure that allows for different configurations in the same
485 . Allow :fail: to specify that 551 be used instead of 550. Maybe allow a code
486 at the start, optionally? What about :defer:?
488 . SMTP timeout in middle of receiving message: log sender address if known, and
489 possibly message_id if known.
491 . Make -brw show rewrites for transports too.
493 . Have the MTA log destinations that have timed-out on a ident request and
494 no longer send rfc1413_queries to them. Add an option for how not to cache
497 . Options and/or a utility to enable non-privileged users to view the queue
498 (e.g. -bpp), manipulate their own messages, etc.
500 . A generalized "From" escaping scheme that also escapes >From so that the
501 whole thing can be reversed.
503 . There was a request for the \dns_again_means_nonexist\ option not to be
504 instantaneous, but to operate only after the DNS has been giving "try again"
505 for some time. Use the misc hints database.
509 ------------------------------------------------------------------------------
510 ------------------------------------------------------------------------------
511 ----- The Exim 4 Wish List ------
512 ------------------------------------------------------------------------------
513 ------------------------------------------------------------------------------
515 (1) 01-Jan-02 U Use of dynamically loaded libraries.
517 People want Exim to use dynamically loaded modules for a variety of reasons.
518 When I started to create Exim, I never expected anything other than source
519 distribution; the RPMs and inclusions in OS distributions caught me by
520 surprise. I know very little about the mechanics of dynamic loading, but I'm
521 aware that not all operating systems support it. I'm also aware that not all
524 Furthermore, a way round this might be to supply more hooks along the lines of
525 local_scan(). Then people can write their own dynamic loaders if they want.
526 ------------------------------------------------------------------------------
528 (3) 01-Jan-02 U Test for over-quota at SMTP time
530 This is a hard one, because the only way to test for over quota is to try to
531 deliver a message, certainly if system quotas are being used. And also, the
532 only available size at RCPT time is the SIZE option, though of course the test
533 could be run at DATA time. I think maybe we leave this one to an external
534 program, and require people to use ${run} to access the data. Let someone else
535 figure out how to extract the current mailbox size!
537 One suggestion is to implement
539 ${file_size:/path/to/file}
540 ${directory_size:/path/to/directory}
542 so that explicit checks can be done. It may be necessary to have four
543 operators, two being based on the block count, and two showing the "visible"
544 size. Directory scanning is expensive; is there any scope for caching? It would
545 seem not (you don't often get two addresses to the same user).
546 ------------------------------------------------------------------------------
548 (6) 01-Jan-02 S Option to disable the use of -t
551 Would require work so that Exim itself doesn't use -t.
552 ------------------------------------------------------------------------------
554 (7) 01-Jan-02 M Avoid showing LDAP passwords in log lines for LDAP errors
557 May be tricky, because at the higher levels, the format of the query is not
558 understood. // There is now a fudge that works in some cases. See ChangeLog
560 ------------------------------------------------------------------------------
562 (9) 01-Jan-02 S Headers as well as body in file for autoreply
564 ------------------------------------------------------------------------------
566 (10) 01-Jan-02 T Make "true" and "false" valid expansion conditions
568 This might help with "and" and "or" when one of the sub-conditions is, for
570 ------------------------------------------------------------------------------
572 (11) 01-Jan-02 S Allow a filter to include another file.
573 ------------------------------------------------------------------------------
575 (12) 01-Jan-02 M Support for different SQL servers per query
577 In other words, the global mysql_servers etc. is too restrictive.
578 ------------------------------------------------------------------------------
580 (14) 01-Jan-02 M? Support for Sendmail milters
582 This could perhaps be done by extending the local_scan() idea and providing a
583 "standard" module which interfaced to milter.
584 ------------------------------------------------------------------------------
586 (15) 01-Jan-02 M More hooks like local_scan()
588 One request has been for a similar hook at logging time. For other SMTP
589 interactions, maybe a hook into the ACL? See also 79 and 218 and 301.
590 ------------------------------------------------------------------------------
592 (17) 11-Jan-02 M The construction of config.h needs refactoring
594 This has been hacked about substantially since the original implementation.
595 Given that there is a program (buildconfig), the messing around with the
596 environment could be abolished. Also, the distinction between "yes" and "no"
597 isn't always properly made (tests for #ifdef don't care about the value).
598 ------------------------------------------------------------------------------
600 (18) 24-Jan-02 S Make $value retain its value after a top-level expansion
602 This was specifically for use in filter files. Currently it reverts to empty
603 as a consequence of save/restore for every lookup. It might be confusing to
604 do otherwise, however.
605 ------------------------------------------------------------------------------
607 (19) 29-Jan-02 L Use of multiple DBM libraries
609 The problem is how to handle conflicting function names. Much research is
611 ------------------------------------------------------------------------------
613 (20) 29-Jan-02 S Make system filter refreeze after manual thaw
615 Currently, a "freeze" in a system filter doesn't freeze after a manual thaw.
616 ------------------------------------------------------------------------------
618 (21) 12-Feb-02 S Expand return_size_limit
621 Is this really worth it? A per-transport value is also suggested - that would
622 mean remembering the value with each failed address and taking a minimum or
623 a maximimum (which?).
624 ------------------------------------------------------------------------------
626 (24) 21-Feb-02 ? A way of testing TLS using -bh
627 ------------------------------------------------------------------------------
629 (27) 06-Mar-02 M Distinguishing between different temporary callout errors
631 The request was to distinguish between a 4xx error and a failure to connect.
632 Problem is: how to cope when there is more than one host? Maybe only if ALL
633 fail to connect. An option like /callout_no_connect_ok.
634 ------------------------------------------------------------------------------
636 (30) 12-Mar-02 S Add "recipients" precondition to routers.
638 This would avoid having to use "condition". (See also requirement for $address
639 mentioned above.) However, it would also require adding a caching feature, and
640 probably $recipient_data (cf $domain_data).
641 ------------------------------------------------------------------------------
643 (31) 21-Mar-02 S Variables that indicate 8-bit message and 8-bit host, and
644 a way of using them to suppress a transport filter
646 A variable that is set if the message contains 8-bit characters, and another
647 that is set during the smtp transport if the host supports 8-bit. Then we also
648 need a condition that's expanded in the transport to control whether the filter
649 is run or not (e.g. transport_filter_condition).
650 ------------------------------------------------------------------------------
652 (32) 22-Mar-02 M More info about callout fails for header sender verify
654 When there's a callout failure for an envelope address, the error message
655 contains details (by default) of the callout commands. This doesn't happen
656 for addresses in the header because there may be more than one of them, and
657 deciding how to give that information is tricky. Can we do better?
658 ------------------------------------------------------------------------------
660 (33) 25-Mar-02 S Option to assume nomatch in dnslist lookups that time out
662 Currently this causes a DEFER.
663 ------------------------------------------------------------------------------
665 (34) 26-Mar-02 S Access to DNS lookup functions via local_scan() API
667 This would make local_scan() writers lives easier for DNS usage.
668 ------------------------------------------------------------------------------
670 (36) 02-Apr-02 ? A way of throttling, but allowing, relaying that would
673 This was suggested in connection with anonymizing messages. The "wait" command
674 in ACLs goes some way towards this. Is it enough?
675 ------------------------------------------------------------------------------
677 (41) 17-Apr-02 T Make config.samples available as a directory for ftp
679 This is so that people can browse individual samples directly.
680 ------------------------------------------------------------------------------
682 (42) 23-Apr-02 T An option not to flatten newlines in $message_body.
684 Or maybe better to provide $message_body_nl so as to have both.
685 ------------------------------------------------------------------------------
687 (43) 23-Apr-02 T An option to treat 4xx as 5xx from STARTTLS
689 This would make Exim retry in clear unless the host is in hosts_require_tls.
690 ------------------------------------------------------------------------------
692 (44) 24-Apr-02 ? Use errors_to for timeouts after redirect syntax errors
694 A syntax error in redirection data (with skip_syntax_errors false) causes a
695 defer. Eventually, the address may time out. This suggestion is that, when it
696 does, the bounce is sent to errors_to rather than to the sender.
697 ------------------------------------------------------------------------------
699 (45) 13-May-02 T smtp_etrn_serialize_id = ....
701 The default behaviour would be equivalent to
703 smtp_etrn_serialize_id = $smtp_command_argument
704 ------------------------------------------------------------------------------
706 (47) 16-May-02 S Access to all addresses in batched local delivery
707 Miquel van Smoorenburg
709 In a batched local delivery with more than one recipient, there's no way to
710 access the list of recipients for doing custom things, such as stuffing them
711 all into a header. (BSMTP is the only approach; not everybody can use it.)
712 Suggested patch supplied.
713 ------------------------------------------------------------------------------
715 (48) 21-May-02 M Support for ATRN (server and client)
718 Server: If Exim had the ability to accept an ATRN command and then simply
719 invoke an external program, passing the SMTP stream on stdin and stdout and
720 the authenticated id as a parameter, that would do the job nicely.
722 Client: We need a variant of 'exim -bs' which would connect to a specified
723 host, send AUTH/ATRN, and then accept incoming messages as usual.
724 ------------------------------------------------------------------------------
726 (50) 22-May-02 S? Add comment (duplicate address) to Envelope-To:
728 This is just to minimize the confusion some people have. However, it is not
729 trivially easy to decide which to label as duplicates because of complications
730 with redirection. I'm not convinced it will actually reduce confusion.
731 ------------------------------------------------------------------------------
733 (51) 07-Jun-02 S Option to use another address in callout MAIL FROM
735 This would be an address to try if MAIL FROM:<> failed. Is this actually going
736 to be helpful? See also 101.
737 ------------------------------------------------------------------------------
739 (53) 11-Jun-02 S Make local_scan() dynamically loadable
741 David Woodhouse sent a patch. There's a more sophisticated one from Marc
742 Merlin. (See also Peter Benie's comments.) But should the base Exim have all
744 ------------------------------------------------------------------------------
746 (54) 11-Jun-02 S Ignore -Ac if called as mailq
748 I am not sure if this makes sense. This flag requests a listing of a different
749 mail queue, but Exim doesn't work like that. Is is not better for people to be
751 ------------------------------------------------------------------------------
753 (55) 13-Jun-02 M Rewriting whole header lines
756 Current rewriting rules apply to individual addresses in header lines. This
757 feature would use a regex to match whole lines and replace them. It could be
758 useful for patching up syntactically invalid lines from crappy clients, before
759 the syntax check kicks in. (It might also be useful for hiding local host names
760 in Received: headers.) See also 333.
761 ------------------------------------------------------------------------------
763 (58) 26-Jun-02 ? Extend PAM support
765 Apparently PAM can do challenge-response authentication. The Exim interface
766 can't handle this. Investigate and think about how to do this.
767 ------------------------------------------------------------------------------
769 (59) 26-Jun-02 M A "custom" authenticator
771 ... that is simply a front end to external code. For example, there may be
772 an external API that hides the user password and does CRAM-MD5 when passed the
773 details of the challenge and response.
774 ------------------------------------------------------------------------------
776 (60) 27-Jun-02 S Make trusted_users a local part list
778 So that it can use lsearch etc.
779 ------------------------------------------------------------------------------
781 (62) 28-Jun-02 S Remove headers before DATA ACL
784 "I'd like to be able to give Exim a list of headers that must be removed
785 from the message at arrival, before data_acl processing (and before the
786 rcpt_acl warn headers are added to the message)." See also 333.
787 ------------------------------------------------------------------------------
789 (63) 28-Jun-02 S Access to ACL-added headers in ACLs
792 "I'd like also to be able to look at the already added headers by a
793 rcpt_acl when still checking rcpt_acl (either later in the acl for the same
794 RCPT TO or for another RCPT TO)." See also 333.
795 ------------------------------------------------------------------------------
797 (65) 28-Jun-02 M Expand fallback hosts
799 See also 174 of the Exim 3 list.
800 ------------------------------------------------------------------------------
802 (66) 01-Jul-02 M Use Berkeley DB 4 concurrent access features
804 This might give better performance on very busy sites by reducing the
805 contention for access to hints databases. Rob Butler points out that this could
806 also be useful to allow updates of other DB files used by Exim to happen
807 concurrently. Another thing to think about with BDB is the possible use of
809 ------------------------------------------------------------------------------
811 (68) 01-Jul-02 S Add sender host to delivery line
813 "Would it be possible to have a "sending_host_on_delivery" option that
814 logs the IP of the sending host in the => line?" Also requested was amount of
815 data transmitted for a non-delivery attempt.
816 ------------------------------------------------------------------------------
818 (69) 03-Jul-02 T Log selector to log whoson checs
821 "I'd quite like a log_selector option which could spot you'd done a whoson
822 lookup in your DATA ACL and maybe log it as W=user."
823 ------------------------------------------------------------------------------
825 (70) 09-Jul-02 S A way of changing the RCPT address in an accept router
827 So as to avoid duplication problems when sending multiple addresses in multiple
828 copies to the same address.
829 ------------------------------------------------------------------------------
831 (74) 22-Jul-02 M Extend -bV to do more semantic checking
833 For example, diagnose "local_hosts" that should probably be "+local_hosts".
834 ------------------------------------------------------------------------------
836 (75) 23-Jul-02 S Reference option on command line
838 The idea here is that a spam scanner that re-injects a message can supply a
839 reference on the command line that gets logged with R=.
840 ------------------------------------------------------------------------------
842 (78) 30-Jul-02 S Expand queue_only (and/or queue_only_file)
844 The requirement is to make it possible to queue messages if certain conditions
845 are met (e.g. messages from certain local users). See also 93.
847 This control can now be achieved in the ACL - is this still needed?
848 ------------------------------------------------------------------------------
850 (79) 31-Jul-02 S Additional info for log lines
852 An option to set an expanded string to be added to <= lines. And also for the
853 other delivery lines? See also 15.
854 ------------------------------------------------------------------------------
856 (84) 09-Aug-02 S Make interfaces available in a variable
858 Something like $local_interfaces. Maybe limit the max length.
859 ------------------------------------------------------------------------------
861 (85) 12-Aug-02 S/M Notice database connection failures
863 The small version of this just removes a server from the list within a single
864 Exim process when a connection to it fails. The bigger project would use the
865 retry database - but that has implications for bottlenecking and may not be
866 helpful. See also item 109. Another suggestion is to randomize the order in
867 which database servers are tried (randomize_database_servers). And another is
868 to measure response times and remember which server is fastest.
869 ------------------------------------------------------------------------------
871 (87) 12-Aug-02 M Partial lookups for query-style lookups
873 The suggestion is to allow the lookup to contain a keystring (same syntax as
874 single-key lookups) which is then permuted and place in a suitable variable
875 each time - $permuted_key or something.
876 ------------------------------------------------------------------------------
878 (88) 20-Aug-02 S Allow special retrying for forced defer
880 See also 146 in Exim 3 wish list above.
881 ------------------------------------------------------------------------------
883 (89) 20-Aug-02 S Also allow retry rules on routers and transports
884 ------------------------------------------------------------------------------
886 (90) 23-Aug-02 M Macros with arguments, a la C
888 I don't like this, because of the cost of frequent interpretation.
889 ------------------------------------------------------------------------------
891 (93) 27-Aug-02 S queue_only_condition
894 queue_only_condition global option, expanded string. This contain
895 condition, which if evaluated to `no' or `false' or `0', behaves like
896 queue_only (queue_only_load ?). Don't know what to do is the string
897 expansion fails with DEFER (either force queueing or continue with
898 immediate delivery). Another option can control Exim behaviour if the
899 expansion fails. Don't know how the name for it ;-) See also 78.
901 This control can now be achieved in the ACL - is the new feature now needed?
902 ------------------------------------------------------------------------------
904 (95) 27-Aug-02 S Log all parents as a router option
906 So that specific addresses can be logged like this. Should there be more log
907 selector options per router? Per transport?
908 ------------------------------------------------------------------------------
910 (99) 28-Aug-02 L Test pre-conditions in order given
912 This would get round certain problems with require_files. However, it is
913 totally incompatible, and therefore an "Exim 5" wish.
914 ------------------------------------------------------------------------------
916 (101) 02-Oct-02 M Callout and <> rejections
918 Some people don't want to fail the callout if the MAIL FROM:<> command is
919 rejected. Think of a way of handling this tidily. See also 51.
920 ------------------------------------------------------------------------------
922 (102) 03-Oct-02 M Log option to suppress message-id logging
924 M because it would involve a change to eximstats.
925 ------------------------------------------------------------------------------
927 (106) 09-Oct-02 S Appendfile to create directory not as user
929 Arrange for the setup entry to appendfile to create the directory under some
930 other uid (and with given owners/permissions?)
931 ------------------------------------------------------------------------------
933 (109) 15-Oct-02 M Remember when LDAP (etc) servers are down
935 The idea would be to use some kind of retry rule, just like for hosts.
937 ------------------------------------------------------------------------------
939 (110) 18-Oct-02 M errors_to for pipe command in filter
941 To work in the same was as errors_to for deliver commands.
942 ------------------------------------------------------------------------------
944 (113) 15-Nov-02 M support for XMLRPC
946 Patch supplied for 4.10 by Joel Vandal.
947 ------------------------------------------------------------------------------
949 (114) 04-Dec-02 M local_scan: return message on accept
951 (This actually dates from earlier.) The problem with this is that the string
952 currently passes into $local_scan_data. Thus, an incompatible change of some
953 sort would be required. Possibly a global that local_scan can set?
954 ------------------------------------------------------------------------------
956 (118) 10-Dec-02 S access to Perl from local_scan
957 ------------------------------------------------------------------------------
959 (119) 12-Dec-02 M ability to specify additional headers in an autoreply
961 This is so that vacation messages etc can have MIME headers that specify, for
962 example, the character set.
963 ------------------------------------------------------------------------------
965 (125) 02-Jan-03 M Per-host daemon logging
967 "So what I would like is an option like debug_hosts, that allows to specify
968 an hostlist, and if the current incoming/outgoing hosts matches, creates a
969 logfile like $hostname_(in|out).log in my logdirectory."
970 ------------------------------------------------------------------------------
972 (127) 06-Jan-03 M Different messages for different callout failures
974 The real requirement here is to detect when a callout "MAIL FROM:<>" failed, so
975 that a specific warning about that can be sent, different to the message when a
976 callout "RCPT TO:" fails. I think this is in fact now mostly done.
977 ------------------------------------------------------------------------------
979 (129) 09-Jan-03 M Keep track of DNSBL timeouts, and refrain from calling
981 If so configured, keep track of DNSBL timeouts in a hints record, and don't
982 retry that DNSBL for a while after (a sufficient number of) timeouts. It is
983 effectively disabled for a while. Log enable/disable, of course. Another
984 thought is an option not to apply +defer_unknown unless *all* DNSBL lookups in
986 ------------------------------------------------------------------------------
988 (130) 09-Jan-03 M A number of LDAP-related things
991 OpenLDAP 2.1 is going to be more popular (2.1.9 is available with many
992 bug fixes). TLS-enabled LDAP is an interesting and usefull thing.
993 I can try to implement some things and send the patches, like with
998 1) The propagation of TLS options (key, certificate, CA certificate)
999 to the OpenLDAP library.
1001 2) (was dereferencing; done in 4.23).
1002 ------------------------------------------------------------------------------
1004 (131) 09-Jan-03 S Additional variables
1009 (Some that were previously here are done)
1011 $smtp_accept_count -- used for acl_smtp_connect
1013 $queue_runners -- children of the listening daemon could use this
1014 value for controlling the number of queue runners
1016 I don't like either of these because they cannot be real-time values. They
1017 would be snapshots of the values at the time the process was forked from the
1018 daemon, and I fear they would just be confusing. For processes that were not
1019 forked from the daemon they couldn't be set at all.
1020 ------------------------------------------------------------------------------
1022 (131) 09-Jan-03 S Additional options
1026 exim_file_descriptors_max
1027 queue_run_condition -- to deprecate queue_run_max, better system
1030 Given Exim's distributed nature, I'm not at all sure how the first two of these
1031 can usefully be implemented.
1032 ------------------------------------------------------------------------------
1034 (132) 16-Jan-03 M Option for when a transport filter fails (crashes)
1036 Freezing is one obvious option. Currently, Exim just retries. Another user
1037 wanted to retry without the filter, but that is much harder.
1038 ------------------------------------------------------------------------------
1040 (136) 24-Jan-03 M Make "personal" available as a condition for use in routers
1041 ------------------------------------------------------------------------------
1043 (138) 28-Jan-03 M A variable containing what was matched in a host list
1045 Or, presumably, other lists. This is so that ACL messages can say things like
1046 "your host name matches xxxx". Note: not the same as $domain_data. Also, this
1047 could be tricky with lookups and things that match in files.
1048 ------------------------------------------------------------------------------
1050 (143) 06-Mar-03 L Ability to have multiple authenticators of same type
1052 For example, to have two PLAIN authenticators; if the first fails, try the
1054 ------------------------------------------------------------------------------
1056 (144) 07-Mar-03 T ACL control = local_scan_skip to skip the local scan
1058 A bigger project would be control = local_scan <xxx> where xxx could select
1059 different local_scan functions (possibly by dynamic loading).
1061 This can now be simulated using the fact that ACL variables are preserved,
1062 so it doesn't look as it once did.
1063 ------------------------------------------------------------------------------
1065 (145) 07-Mar-03 T Export string_cat() to local_scan()
1066 ------------------------------------------------------------------------------
1068 (147) 17-Mar-03 T Option to treat 5xx as 4xx if received on initial connection
1070 This issue is controversial. That may be a good reason for not changing
1072 ------------------------------------------------------------------------------
1074 (153) 25-Apr-03 S A way of making log_as_local apply to the smtp transport
1076 Either an option on the transport, or log_remote_as_local for the router.
1077 Messy, either way. Maybe log_local_as_local and log_remote_as_local, and
1078 deprecate log_as_local?
1079 ------------------------------------------------------------------------------
1081 (154) 01-May-03 M Teergrubing at the CR/LF level
1083 It is believed that the most effective way to teergrube is to insert a delay
1084 between transmitting CR and LF in the SMTP response. Furthermore, this is also
1085 the best place to test for bad synchronization (i.e. at the last possible
1087 ------------------------------------------------------------------------------
1089 (155) 01-May-03 S "control=no_pipelining" for connect and EHLO ACLs
1091 Yet more flexibility! Maybe this should be a more general control for what is
1092 sent in response to EHLO.
1093 ------------------------------------------------------------------------------
1095 (156) 06-May-02 M Finer-grained synchronisation checking
1097 On operating systems that can be asked whether any sent bytes have not yet been
1098 ACK'd at the TCP/IP level, a finer-grained check for proper synchronisation can
1099 be done. All bytes must have been ACK'd if the client has received the previous
1100 response before sending the next command. See also 293.
1101 ------------------------------------------------------------------------------
1103 (157) 07-May-03 M Newline as a list item separator
1105 This will make life easier for lists obtained form databases where the
1106 separator is naturally a newline.
1107 ------------------------------------------------------------------------------
1109 (158) 13-May-03 M Ability to add to OK message for SMTP commands
1111 For sending reasons for slow response, etc.
1112 ------------------------------------------------------------------------------
1114 (160) 19-May-03 M Remove headers using wild cards
1117 ------------------------------------------------------------------------------
1119 (162) 28-May-03 M/L Use of real numbers in filters, expansions, and options
1121 The motivation for this is for handling spam scores that are real numbers. The
1122 questions are (a) how widely should it spread and (b) whether floating point or
1123 fixed point representations should be used. And what about the eval operator?
1124 ------------------------------------------------------------------------------
1126 (164) 02-Jun-03 S Set variables for interface and port in smtp transport
1128 These could be useful for varying HELO data etc. See also several other
1129 items about interfaces above.
1130 ------------------------------------------------------------------------------
1132 (166) 18-Jun-03 S CN verification in client TLS code
1134 A tls_verify_cn option is suggested by Sven Geggus.
1135 ------------------------------------------------------------------------------
1137 (168) 19-Jun-03 S Ability to add a header recording envelope rewrites
1139 Current code adds a deleted header with only some information. Maybe what is
1140 needed is a flag for a rewrite rule.
1141 ------------------------------------------------------------------------------
1143 (169) 19-Jun-03 M A way of detecting timeouts in callout returns
1145 ------------------------------------------------------------------------------
1147 (170) 23-Jun-03 S Option to accept rather than defer after local scan timeout
1149 Suggested patch supplied.
1150 ------------------------------------------------------------------------------
1152 (172) 23-Jun-03 M Option to make SQL query to specific server
1154 ------------------------------------------------------------------------------
1156 (175) 04-Jul-03 S show_all_ancestors_in_errmsg for the redirect router
1158 This is the opposite of hide_child_in_errmsg in effect.
1159 ------------------------------------------------------------------------------
1161 (180) 14-Jul-03 M Extend never_users to be more flexible
1163 e.g. never_users = ! mailnull : ! cyrus : !mailman : 0-100
1164 ------------------------------------------------------------------------------
1166 (183) 16-Jul-03 S freeze_tell_text to add custom text to the message
1168 ------------------------------------------------------------------------------
1170 (185) 24-Jul-03 S An expansion operator that decodes RFC 2047 strings
1172 ------------------------------------------------------------------------------
1174 (188) 13-Aug-03 T batch_max=0 to mean unlimited
1176 ------------------------------------------------------------------------------
1178 (189) 22-Aug-03 S Allow filter "logwrite" to write to syslog
1180 I feel this is a dangerous facility, and also of very minority interest, at
1181 least for user's filters. Allowing a system filter to write to mainlog or
1182 syslog may be different. However, writing the main log would only be possible
1183 if the filter runs as root or exim.
1184 ------------------------------------------------------------------------------
1186 (190) 22-Aug-03 S A way of testing "forced delivery" in filter and routers
1187 ------------------------------------------------------------------------------
1189 (191) 26-Aug-03 M Preserve $address_data for a verified recipient
1191 The idea is to preserve it in the recipients data structure so that local_scan
1192 can have access to it. The value could also be used as the initial value of
1193 $address_data while routing.
1194 ------------------------------------------------------------------------------
1196 (192) 05-Sep-03 M Better handling of TXT records for dnslists
1198 When multiple lists are accessible via a merged lookup, handling TXT records
1199 is difficult. An option for doing the TXT lookup in a sub-list has been
1200 suggested, with syntax such as
1202 dnslists = list.example.org=127.0.0.2%dialups \
1205 ------------------------------------------------------------------------------
1207 (194) 10-Sep-03 M $addresslist_data to be like $host_data/$domain_data
1209 ------------------------------------------------------------------------------
1211 (195) 29-Sep-03 M A variable containing the error for verify = header_syntax
1213 Maybe there should always be a variable with the error message for all the
1214 different kinds of verify failure.
1215 ------------------------------------------------------------------------------
1217 (197) 30-Sep-03 S MACROS_DROP_PRIVS and ALT_CONFIG_DROP_PRIVS
1219 Now that alternative configurations can be restricted to certain directories,
1220 some more flexibility can be allowed. Not by default, though.
1221 ------------------------------------------------------------------------------
1223 (198) 01-Oct-03 M Accept mail after local_scan() crash instead of defer
1225 This may not be as easy to implement as it sounds; one is never sure of the
1226 environment after a crash. Is is actually a good idea? The crashing local_scan
1227 may have wrecked the memory in arbitrary ways; for example, screwing up the
1229 ------------------------------------------------------------------------------
1231 (199) 01-Oct-03 M ${pipe which will pipe the message to a script ...
1233 ... and otherwise behave as ${run. Probably needs to have locking out features
1234 so that it can be turned off for users .forwards if the sysadmin so desires.
1235 ------------------------------------------------------------------------------
1237 (200) 07-Oct-03 L Alternative ways of storing hints
1239 People want to store hints in databases. Some assert that SQL databases can
1240 be made to perform satisfactorily. If a general interface could be worked on,
1241 people could at least try different strategies. See also 66 above, which is
1242 specifically concerned with Berkeley DB. Another possible option is a switch to
1243 disable smtp-wait hints - to avoid contention problems.
1244 ------------------------------------------------------------------------------
1246 (201) 07-Oct-03 M A "soft bounce" feature
1248 This is an option that turns all hard bounces into soft bounces. The idea is
1249 that it can be used as a safety-net while testing configurations. Instead of a
1250 local bounce, the message stays on the queue; instead of 5xx SMTP responses,
1252 ------------------------------------------------------------------------------
1254 (202) 10-Oct-03 S -bvsomething to do a callout after the verify
1256 For example: -bvc and -bvsc. The problem now (Nov 04) is that there are quite a
1257 few possible callout options that can be specified in an ACL, and they would
1258 have to be replicated here.
1259 ------------------------------------------------------------------------------
1261 (203) 14-Oct-03 S verify=something to easily check for header presence
1263 This is purely cosmetic; "condition" can already be used.
1264 ------------------------------------------------------------------------------
1266 (204) 27-Oct-03 S an inverted queue_only_file
1268 That is, queue if a file does NOT exist.
1269 ------------------------------------------------------------------------------
1271 (205) 27-Oct-03 S expand smtp_accept_queue_per_connection
1273 ------------------------------------------------------------------------------
1275 (206) 27-Oct-03 S appendfile: a variable containing the maildir base name
1277 ------------------------------------------------------------------------------
1279 (207) 29-Oct-03 S ability to keep trusted users in a file - expand it.
1280 ------------------------------------------------------------------------------
1282 (208) 31-Oct-03 M cache temporary verification errors and fail after a time
1284 This request was for a way of turning temporary verification failures into
1285 permanent ones after some fixed time.
1286 ------------------------------------------------------------------------------
1288 (209) 31-Oct-03 S a way of making crashes in pipe commands temporary errors
1289 ------------------------------------------------------------------------------
1291 (210) 31-Oct-03 S runtime option to change the daemon name used for tcprwappers
1293 A patch for compile time was supplied, but this seems better as a runtime
1294 option, for use with multiple Exim daemons.
1295 ------------------------------------------------------------------------------
1297 (211) 31-Oct-03 S ability to disable debugging output from -bh & -bhc
1298 ------------------------------------------------------------------------------
1300 (212) 31-Oct-03 M specify headers lines in HELO ACL to be added to all msgs
1303 ------------------------------------------------------------------------------
1305 (214) 05-Nov-03 S Put the wild part of local part prefix/suffx in variables
1307 Unfortunately, this isn't quite as trivial as it seems.
1308 ------------------------------------------------------------------------------
1310 (215) 26-Nov-03 M/L Conversion of IDNA domain names for logging
1312 IDNA (RFCs 3490-3492) converts domains names containing non-ASCII characters
1313 into ASCII strings of a special form. Exim will of course handle these.
1314 However, it might be nice to convert them to a local code for logging. This
1315 might be quite a big project: there's also output from -bp and eximon queue
1316 display and no doubt other places as well. (Utilities that process the logs,
1317 e.g. exigrep, eximstats, will be automatically handled if the logs are
1319 ------------------------------------------------------------------------------
1321 (217) 27-Nov-03 M A function to pass back variables from Perl
1323 This is a function that can be called from Perl, to take a name and a value and
1324 put that value into an Exim variable.
1325 ------------------------------------------------------------------------------
1327 (218) 01-Dec-03 M A local_scan-like hook at system filter time
1329 That is, make a C API available for custom filtering at this point.
1330 ------------------------------------------------------------------------------
1332 (221) 18-Dec-03 U Merge routers and ACLs - or at least make more similar
1334 "It will be very useful to be able to use most of the ACL conditions
1335 (authenticated, hosts, senders, sender_domains, ... ) in routers and also the
1336 possibility to have multiple conditions in routers. It will be great to also
1337 be able to set variables in routers like in acl's." This is effectively a
1338 radical suggestion for a complete re-design, and is therefore BIG.
1339 ------------------------------------------------------------------------------
1341 (223) 22-Dec-03 S Support SOA lookup in dnsdb lookups
1343 This could be like zns, and climb up the tree till it hits a zone. Would the
1344 name of the zone be required?
1345 ------------------------------------------------------------------------------
1347 (225) 22-Dec-03 M Add acl= to routers
1349 This would use an ACL to "control access" to a router, opening up a number
1350 of interesting possibilities. Details of possible limitations need to be
1352 ------------------------------------------------------------------------------
1354 (226) 23-Dec-03 S A way of treating DEFER as fail in dnsdb lookups
1356 (i.e. the dnsdb lookup failed, so accept the message)
1357 ------------------------------------------------------------------------------
1359 (227) 30-Jan-04 M A configuration .if facility
1361 "Second with the .ifdef and such, it would be nice to have a base .if,
1362 so I could do something like
1363 .if DEFINED_DATA == xyz
1365 .elseif DEFINED_DATA == abc
1370 also this would be nice at least in my case in the system filters, but
1371 isn't required but you could pass the defined data to the system, in
1373 ------------------------------------------------------------------------------
1375 (229) 30-Jan-04 M New expansion mechanism: {list ...}
1377 "Proposed syntax: {list {separator}{item}{item}...}
1378 This first expands the contents of {separator} and all of the {item}s,
1379 then constructs a separator-delimited list. The twist is: if an {item}
1380 generates the empty string, no separator will be generated for it.
1381 The entire construct will fail is {separator} fails, or all {item}s
1382 fail. If just some {item}s fail, they will be treated as if they
1383 generated empty strings.
1385 {list {,}{aaaaaa}{bbbbbb}{cccccc}} -> aaaaaa,bbbbbb,cccccc
1386 {list {,}{:fail:}{bbbbbb}{cccccc}} -> bbbbbb,cccccc
1387 {list {,}{aaaaaa}{:fail:}{cccccc}} -> aaaaaa,cccccc
1388 {list { }{aaaaaa}{bbbbbb}{}} -> aaaaaa bbbbbb
1389 {list { }{:fail:}{:fail:}{:fail:}} -> :fail:
1390 {list {:fail:}{aaaaa}{bbbb}{cccc}} -> :fail:
1391 See particularly examples 2-4, which handle the case of a missing first
1392 and last item with ease; doing this using {if ...} would be quite difficult!"
1393 ------------------------------------------------------------------------------
1395 (230) 30-Jan-04 M Find IP addresses of a domain's nameservers
1397 This needs some way of processing a list of things in a similar way, which
1398 should perhaps be a more general facility. // This can now be done using the
1399 list facilities of dnsdb; verbose, but it can be done. //
1400 ------------------------------------------------------------------------------
1402 (231) 30-Jan-04 ? -C has a number of problems when used for real
1404 -C was intended for testing; people are using it for "alternate"
1405 configurations, and it doesn't work too well. Can a better way of doing this be
1407 ------------------------------------------------------------------------------
1409 (232) 02-Feb-04 ? Make parts of the code loadable
1411 The idea being that drivers, etc. could be compiled separately. There are, of
1412 course, security issues. This is not something I want to go into at present.
1413 ------------------------------------------------------------------------------
1415 (235) 02-Feb-04 T Make smtp_accept_count available as a variable
1417 This is for use in ACLs. Of course, it is a snapshot of the count at the
1418 start of the receiving process. As such, it could be confusing because if a
1419 connection lasts a long time, the "true" value could be very different. For
1420 this reason, I don't really like this idea.
1421 ------------------------------------------------------------------------------
1423 (236) 02-Feb-04 S String in local_scan that's added to the binary version string
1424 ------------------------------------------------------------------------------
1426 (238) 05-Feb-04 S ${address to handle multiple addresses
1428 At present, ${address expects to see just one address. An extension would let
1429 it handle header lines with multiple addresses, just retaining the actual
1430 addresses. Or perhaps a new operator is needed?
1431 ------------------------------------------------------------------------------
1433 (239) 23-Feb-04 ? Expansion items for encryption/decryption
1435 Perhaps for some kind of cookie handling? This would need an external crypto
1436 library, because there's no crypto code in Exim itself.
1437 ------------------------------------------------------------------------------
1439 (240) 23-Feb-04 ? Some way to know if a ip is a mx for a given domain
1441 Some kind of iterative operation for dnsdb might be a general way of providing
1442 this. // This can now be done using the list facilities of dnsdb; verbose, but
1444 ------------------------------------------------------------------------------
1446 (242) 01-Mar-04 ? Run a filter from an expansion condition
1448 This would add a lot of power to ACLs, but its implementation might be tricky
1449 because of the possibility of recursion.
1450 ------------------------------------------------------------------------------
1452 (243) 01-Mar-04 ? Run an ACL from an expansion condition
1454 The problem here is knowing what data is available at an arbitrary time.
1455 ------------------------------------------------------------------------------
1457 (244) 01-Mar-04 ? Add an on-success event to transports
1459 This could just be an expansion string, whose value is either ignored or
1460 logged, but it could be used to run SQL updates or run programs etc.
1461 However, what is "success" when a transport has multiple recipients?
1462 ------------------------------------------------------------------------------
1464 (245) 01-Mar-04 M Add all the string expansion conditions to filters
1466 Some thought would be needed on how to design the syntax for this.
1467 ------------------------------------------------------------------------------
1469 (247) 09-Mar-04 S IP addresses that are never looked up
1471 It would be nice if we could prevent this for certain IP addresses for
1472 which we _know_ we'll never get a valid PTR record, like 2002::/16.
1473 So a new option might reasonably default to:
1475 hosts_never_lookup = <; 2002::/16
1476 ------------------------------------------------------------------------------
1478 (253) 05-Apr-04 M Use ESMTP and TLS for recipient callout verification
1480 The best way to do this would involve quite a bit of refactoring so as to
1481 abstract some of the code from the smtp transport into subroutines that could
1482 also be used from the callout code. The tls parameters should probably be
1483 taken from the transport. That might also require some substantial code
1484 refactoring. See also 294.
1485 ------------------------------------------------------------------------------
1487 (260) 30-Apr-04 S Respect +tls_cipher +tls_peerdn in rejectlog entries
1489 ------------------------------------------------------------------------------
1491 (261) 05-May-04 S Add a "required_version" option
1493 So that configurations can insist on a specific Exim version.
1494 ------------------------------------------------------------------------------
1496 (262) 10-May-04 S Add "scratch" ACL variables
1498 The idea is for variables that are flushed at the start of each ACL. I'm not
1499 really convinced that these are worth implementing.
1500 ------------------------------------------------------------------------------
1502 (263) 10-May-04 S Add variable $router_name $transport_name
1504 These could be used in debug_print settings, which are output during -bt, and
1505 thus don't need the privilege to run with -d.
1506 ------------------------------------------------------------------------------
1508 (265) 25-May-04 M An init.d script for exim is needed
1510 The old sendmail script used to "just work" because it just did -bd -q 20m or
1511 whatever. Newer versions start more than one sendmail daemon, so do not work.
1512 ------------------------------------------------------------------------------
1514 (267) 25-May-04 S tarpitting delay option
1516 A modifier that sets a delay between lines for multiline responses.
1517 ------------------------------------------------------------------------------
1519 (268) 25-May-04 S? Add a PID to every log line
1521 Given that pids are reused non-cyclically these days, is this actually useful?
1522 ------------------------------------------------------------------------------
1524 (270) 01-Jun-04 M Add headers at top and middle
1526 Various initiatives like SPF and DomainKeys require header lines to be added
1527 above or in the middle of existing headers. Exim always adds at the bottom.
1528 When these requirements are more standard and clearer, some way of controlling
1529 where header lines are added will probably become necessary. Some new syntax
1532 This can now be done fairly generally from local_scan(), and at the start and
1533 after the Received: block from an ACL. Is anything more needed? See also 333.
1534 ------------------------------------------------------------------------------
1536 (271) 02-Jun-04 L Callouts at routing time
1538 From a user's message:
1540 > I would like to be able to:
1542 > 2) Forcing callouts as address verification at router level
1543 > [ check_callout just like check_local_user ]
1545 > I would like to redirect messages in some domain to "domain with callout
1546 > verification" and to "domain without callout verification"
1549 > userA@domain.in -> userX@doamin.out-verify (use callout to verify)
1550 > userB@domain.in -> userY@doamin.out-noverify (do not use callout verify)
1552 > [both out-* domains delivered via "callout ready" transports]
1554 Other versions of the wish:
1555 * limiting callouts in acls to specific transport
1556 verify = recipient/callout=5s,transport:intranet_smtp
1557 * adding "select transport" to ACL conditions
1558 accept domains = +local_domains
1559 transport = cyrus_ltcp
1560 verify = recipient/callout=5s
1561 ------------------------------------------------------------------------------
1563 (272) 07-Jun-04 S Expand hosts_randomize
1565 It occurs in manualroute and in smtp.
1566 ------------------------------------------------------------------------------
1568 (278) 21-Jun-04 M quota_warn_message_file option
1570 Similar to the bounce and delivery warn message files.
1571 ------------------------------------------------------------------------------
1573 (280) 23-Jun-04 M A way of adding a header line after callout defer_ok
1575 This would record that, e.g., a sender domain verified, but the callout
1576 could not be done. There are ways of fudging this, using ACL variables and
1578 ------------------------------------------------------------------------------
1580 (285) 16-Jul-04 M Separate and independent log_selector for rejectlog
1582 For example: mainlog_selector and rejectlog_selector, with log_selector setting
1584 ------------------------------------------------------------------------------
1586 (288) 10-Aug-04 M Option for verify to require MX
1588 e.g. verify=sender/require_mx
1589 I'm not too keen because this is rather special purpose, and of course could
1590 only apply if the verification happened to hit a dnslookup router.
1591 ------------------------------------------------------------------------------
1593 (289) 10-Aug-04 L Option to treat defers in database lookups as "not found"
1595 This is so that alternatives can be coded for when databases are down. A
1596 suggested patch has been sent, but it just catches all instances of "defer"
1597 from a lookup in an expansion string. These can occur for a number of different
1598 reasons, not just connection failures. I think that we need a specific
1599 "connection failed" indicator. Also, what about lookups in lists?
1600 ------------------------------------------------------------------------------
1602 (291) 13-Aug-04 M An ACL or "local_scan()" to be run on size excession
1604 The idea is to give something a chance to look at the data so far received when
1605 more than message_size_limit (or some other limit) has arrived. I am not sure
1606 how useful this would actually be in practice.
1607 ------------------------------------------------------------------------------
1609 (292) 13-Aug-04 M Overall timeout for message reception
1611 A client could in priciple keep an SMTP connection open for a very long time by
1612 trickling in data very slowly. Also, after message_size_limit is exceeded, Exim
1613 continues to swallow the data (though it does not write it to disk) until the
1614 end is reached. Again, the connection could be held open for a very long time.
1615 Some kind of overall time limit for an SMTP connection, possibly reset at the
1616 start of each message, might be helpful in these situations.
1617 ------------------------------------------------------------------------------
1619 (294) 23-Aug-04 L Callouts and AUTH and LMTP
1621 People want to do callouts using LMTP as well as SMTP, and that would also
1622 include sockets as well as TCP/IP connections. Also, people want to make use of
1623 AUTH during the callout checking, on all types of connection. I suppose that
1624 means making TLS available as well. This probably means a rewrite of the code
1625 that actually does the callout. Should we use the relevant transport in a new
1626 "callout" mode instead of keeping things separate? See also 253 and 323.
1628 And here's another submitted idea: "My actual suggestion is that if this model
1629 is followed, the parent process doesn't have to stop the callout process if it
1630 is taking too long to respond: it can return 450 to the incoming connection
1631 within the 5 minute SMTP command timeout and leave the callout process to
1632 continue, in the hope that it will eventually get a result and store it in the
1633 callout cache in time for the sender's next attempt."
1634 ------------------------------------------------------------------------------
1636 (296) 09-Sep-04 S Make deliver_time work for == lines as well as =>
1638 What about ** lines?
1639 ------------------------------------------------------------------------------
1641 (299) 25-Oct-04 S Options to make Sieve "keep" pass to next router
1643 Currently, "keep" saves in the mailbox. Probably need two options, for implicit
1644 and explicit keep commands.
1645 ------------------------------------------------------------------------------
1647 (301) 27-Oct-04 M Use an "ACL" to filter logging
1649 This idea was for ACL syntax to be able to "accept" or "deny" individual log
1650 lines. This would make it possible to have, for example, per-host logging for
1651 certain things. See also 15 above.
1652 ------------------------------------------------------------------------------
1654 (302) 28-Oct-04 M Expand pass_router and redirect_router
1656 Doing this would mean postponing the validity checks till the router was
1657 actually used instead of doing them at start up. It does not seem to be a
1658 facility that will be widely used.
1659 ------------------------------------------------------------------------------
1661 (303) 28-Oct-04 M Support SQL relay
1663 This would make it easier for packagers to support "generic SQL" without having
1664 to choose which one. It can be slotted in using a MySQL interface without
1665 modifying Exim, but native support would be nice.
1666 ------------------------------------------------------------------------------
1668 (304) 02-Nov-04 M A way of seeing the whole message in Perl or ${run
1670 At present, the headers are available in $message_headers, but only part of
1671 the body is visible. The only way to pass the whole body would be as a file
1672 descriptor because it can be very large. See also (42).
1673 ------------------------------------------------------------------------------
1675 (305) 02-Nov-04 M A Perl transport
1677 The suggestion here is that an embedded Perl function takes responsibility for
1678 doing the delivery. I am not at all keen on this. One way of doing it would be
1679 to implement (244), which provides an "on success" string expansion. Then
1680 anyone who wants this could run that on a transport that does nothing.
1681 ------------------------------------------------------------------------------
1683 (306) 09-Nov-04 M Make the search type partial-lsearch*@ be useful
1685 At present, it treats the whole key as a domain for the partial search, then
1686 does the *@ thing. A more sensible plan would be something like:
1694 That is, try the local part and * at each of the partial domain values.
1695 ------------------------------------------------------------------------------
1697 (307) 24-Nov-04 S Check the syntax of Message-ID: header lines
1699 This could be added to "verify=header_syntax" or, if the incompatibility is
1700 felt to be too great, an additional condition, or a sub-option, could be added.
1701 ------------------------------------------------------------------------------
1703 (308) 24-Nov-04 S Add $body_longlinecount and $header_longlinecount
1705 These variables would hold the number of physical lines in the body and header
1706 that were longer than 998 bytes. This would be fiddly to implement because of
1707 the way Exim currently reads the input. It isn't just a trivial patch.
1708 ------------------------------------------------------------------------------
1710 (309) 01-Dec-04 S/M Queue runners should get locks before forking
1712 If a queue-runner opened the -D file and took out the lock before forking, it
1713 would waste fewer resources if the message was already being delivered. But how
1714 often would this actually matter in practice?
1715 ------------------------------------------------------------------------------
1717 (310) 06-Dec-04 S After "personal" save what matched
1719 The idea is to save the email address that actually was found in the message
1720 in a variable so it can be used (e.g. as the From: address in an autoreply).
1721 ------------------------------------------------------------------------------
1723 (311) 07-Dec-04 ? More flexible SMTP response codes
1725 The requestor wanted to be able to specify, for example, 551 in an ACL deny
1726 instead of 550, and also vary the defer code. The first digit, however, should
1727 remain fixed. In addition to main codes, enhanced status codes (RFC 2034) were
1728 requested. (As far as I can tell, they have never been highly popular.)
1729 ------------------------------------------------------------------------------
1731 (312) 10-Dec-04 ? Shadow remote transports
1733 Unless a lot of work is done, this would be restricted to another remote
1734 transport. A similar effect could therefore be achieved with "shadow_hosts"
1735 which are like fallback_hosts but which operate on success.
1736 ------------------------------------------------------------------------------
1738 (313) 21-Jan-05 ? Multiple queues
1740 Exim runs poorly if its queue gets too big. Various ways round this are all
1741 to some extent kludges. There has been a suggestion of using multiple
1742 directories instead of just "input". (Originally it was for a whole set of
1743 spool directories, but that introduces complications with the hint files.)
1744 On message arrival, somehow a selection of "input" must be made. Then queue
1745 runners must be startable for the different "queues". Don't forget that the
1746 "msglog" directory is also involved. Perhaps add a new level of indirection:
1747 /var/spool/exim/queue1/{input,msglog}, /var/spool/exim/queue2/....
1748 ------------------------------------------------------------------------------
1750 (314) 15-Feb-05 M Multiple headers_{add,remove} for routers
1752 If headers_{add,remove} could be specified multiple times, it would be easier
1753 for those people that construct configs using .ifdef or .include, etc. See also
1755 ------------------------------------------------------------------------------
1757 (315) 15-Feb-05 M String variables for use in filters.
1759 Currently, only numerical variables are supported.
1760 ------------------------------------------------------------------------------
1762 (316) 21-Feb-05 M Put callout response into a variable
1764 When a callout fails, put the entire SMTP response into a variable. This is not
1765 trivial because we probably should retain it in the cache as well.
1766 ------------------------------------------------------------------------------
1768 (317) 25-Feb-05 S Delete the pid file when the daemon exits
1770 At least try to catch some of the exit routes from the daemon and either delete
1771 or empty the pid file.
1772 ------------------------------------------------------------------------------
1774 (318) 02-Mar-05 S Add current connection count to daemon's exiwhat output
1775 ------------------------------------------------------------------------------
1777 (319) 03-Mar-05 ? Allow file rather than directory for scanning call
1779 "I can call arbitrary scanning software by specifying the full path. I can pass
1780 a directory to be scanned in the arguments. I'd like to be able to pass a
1781 specific file name instead of a directory. I think this would allow me to call
1782 Bogofilter at smtp time. Bogofilter requires a filename, not a directory. The
1783 file would contain the complete email. I suppose there may be other scanning
1784 solutions with a similar requirement."
1785 ------------------------------------------------------------------------------
1787 (321) 07-Mar-05 S Run an ACL on a sync error
1789 ... and possibly "accept" or "deny" it.
1790 ------------------------------------------------------------------------------
1792 (322) 15-Mar-05 M Add a /defer_ok option to verify=reverse_host_lookup
1793 ------------------------------------------------------------------------------
1795 (323) 15-Mar-05 M Make callouts use smtp_data from the smtp transport
1797 This is yet another problem caused by duplicating the SMTP code between the
1798 transport and the callout verification. See item 294 above. Merging the
1799 transport and the callout code could prevent this kind of thing from happening.
1800 ------------------------------------------------------------------------------
1802 (324) 04-Apr-05 ? Make -bP show ACLs
1804 This is in the Bugzilla as #10.
1805 ------------------------------------------------------------------------------
1807 (326) 03-May-05 ? Queue-only on memory shortage
1809 This is bugzilla #17. The idea is to have something like queue_only_load that
1810 triggers on a shortage of main memory.
1811 ------------------------------------------------------------------------------
1813 (327) 06-May-05 ? Break delay if connection drops
1815 Currently, "delay=5m" (e.g.) waits for 5 minutes. If we can detect that the
1816 connection has died in the meantime, it would make sense to break the delay.
1817 However, it doesn't seem possible to detect a dropped connection without trying
1819 ------------------------------------------------------------------------------
1821 (328) 10-May-05 S After "unseen" routing, pass on header additions/deletions
1823 Currently, when an "unseen" router accepts an address, header additions and
1824 deletions stick with that address, and the "clone" address that continues to be
1825 routed starts off without any additions or removals. This request is for an
1826 option to select other actions: retain header actions with the clone only, or
1827 pass them on to both addresses. See also 333.
1828 ------------------------------------------------------------------------------
1830 (329) 12-May-05 S Create message ID at MAIL FROM time
1832 Currently, the ID is created only when Exim is about to create the data (-D)
1833 file for an incoming message. In other words, after it knows it really is going
1834 to accept the message. Creating the ID earlier would mean that rejection
1835 messages in the log would be tagged with an ID, and this is seen as desirable
1837 ------------------------------------------------------------------------------
1839 (330) 31-May-05 ? Default interface for -bh and default port for -oMi
1841 I do not think it worth putting effort in here for these reasons: If a host has
1842 multiple interfaces, there's no easy way to choose one to be the default for
1843 $interface_address when -bh is used. If the host does not have multiple
1844 interfaces, chances are the configuration won't be looking at
1845 $interface_address anyway. If you are setting -oMi, and care about the port, it
1846 isn't much effort to tack on a port number, though in this case, I suppose a
1847 default of 25 is "obvious".
1848 ------------------------------------------------------------------------------
1850 (331) 31-May-05 M More than one retry time per host
1852 Consider this example: an attempt to start a TLS connection to a host gets a
1853 temporary error. This stops *all* connections, both for TLS and otherwise.
1854 Different retry times for different circumstances are needed to get round this.
1855 What are the circumstances? TLS/not-TLS is clearly one, but sometimes you don't
1856 know if you are going to try TLS until you have connected. So this makes sense
1857 only if require_tls is used. Perhaps the multiple retry times should just be
1858 per-transport, to avoid these difficulties. If we made all retry keys depend on
1859 the transport, this would happen automatically.
1860 ------------------------------------------------------------------------------
1862 (332) 03-Jun-05 S A "receive time taken" log selector
1864 This suggestion is to at an RT= item to the <= line, giving the time it
1865 actually took to receive the message.
1866 ------------------------------------------------------------------------------
1868 (333) 06-Jun-05 L Re-think and re-implement header handling
1870 There are a number of items related to headers above. Better facilities for
1871 handling headers at ACL time are needed. The whole way in which Exim handles
1872 headers should be re-planned and re-implemented in a more consistent manner.
1874 These are the main previous items:
1876 Exim 3 Wish List: 41, 85, 149, 187.
1877 Exim 4 Wish List: 55, 62, 63, 160, 212, 270, 314, 328.
1878 ------------------------------------------------------------------------------
1880 (334) 07-Jun-05 M Support for messages larger than 2G
1882 This is probably a longish-term thing at the moment. Quotas over 2G are now
1883 supported, but not individual messages; no doubt one day this will be wanted.
1884 ------------------------------------------------------------------------------
1886 (336) 16-Jun-05 M Show recipient(s) after header check failure
1888 The mainlog line for "There is no valid sender in any header line" shows the
1889 sending host and the envelope sender, but does not show any recipients. There
1890 has been a request to show recipients. Presumably this should be on some new
1891 log selector, and it must have a cutoff maximum number of recipients. NOTE: the
1892 data in the reject log does show the envelope recipients as part of its
1894 ------------------------------------------------------------------------------
1896 (337) 29-Jun-05 S Add "defer" to $recipient_verify_failure
1898 This is for when defer_ok was set when verifying recipients. Since this isn't
1899 for a failure, we probably also need "ok" for the non-fail case.
1900 ------------------------------------------------------------------------------
1902 (338) 14-Jul-05 M Change to Bind 9 API
1904 Exim uses the original API for calling the DNS resolver. There is a newer API
1905 available, and noises are being made in some OS that compatibility with the old
1906 API is going to be dropped. Nevertheless, there are sure to be systems about
1907 for ages that require the use of the old API. Therefore, we will have to
1908 implement not only an interface to the new API, but a backwards compatibility
1909 feature. It would be nice if this was automatic.
1910 ------------------------------------------------------------------------------
1912 (339) 28-Jul-05 S Log name of maildir file
1914 This wish is for an option to log the name of the file that is written in
1915 maildir format (e.g. time.pid.host).
1916 ------------------------------------------------------------------------------
1918 (340) 30-Aug-05 M Match more than one item
1920 match_address, for instance, matches one address to a list. The wish is to be
1921 able to supply two lists; for each address in the first list, search the
1922 second. Maybe something like ${match_any{...}{...}} is needed.
1923 ------------------------------------------------------------------------------
1925 (341) 15-Sep-05 S Add /return_path_retain to submission mode
1927 This would re-instate the behaviour prior to change 4.52/PH/04.
1928 ------------------------------------------------------------------------------
1930 (342) 26-Sep-05 T Log and maybe defer odd values for condition pre-condition
1932 Odd values for "condition" in an ACL cause it to defer. In a router, they are
1933 treated as "true". At least they should be logged in a router, and perhaps they
1934 should also defer, for compatibility with ACLs.
1935 ------------------------------------------------------------------------------
1937 (343) 03-Oct-05 M A query-style lookup for scanning flat files
1939 The natural syntax for this would be to use a regex, like this:
1940 ${lookup regex{/some/file regex}{found-string}{not-found-string}}
1941 However, it would be natural to want to use $1 etc in the found-string; this
1942 would be hard because of the lookup caching (if repeated, the lookup won't
1943 actually be done and therefore the numerical variables won't be set), and in
1944 any case, even without caching (and it could, I suppose, be disabled for this
1945 lookup) those variables are not in the right storage pool even if they were
1946 preserved after the lookup.
1948 An alternative approach might be to implement something like this:
1950 ${scanfile{/some/file}{sub-expression}}
1952 where the sub-expression is expanded for every line in the file, with each line
1953 in turn being put into $value. This is like a conditional ${readfile, and in
1954 fact ${readfile could be written using ${scanfile. It would be nice to find a
1955 way of stopping the scan once something has happened. The only thing I can
1956 think of is to invent a variable that changes when scanning a line generates
1957 some non-null text, and then always to stop on a forced failure. That would
1958 allow expressions like this:
1960 ${scanfile{/some/file}
1962 ${if eq{$generated}{}{${if match{regex}{$value}{something}}} fail}
1965 It's all rather clumsy. Once a line has matched and generated some text, the
1966 next iteration would stop the scan. Another thought: maybe use $scanline
1967 instead of $value (to save confusion) and have $scantext containing everything
1968 that's been generated so far. That sounds pretty flexible.
1969 ------------------------------------------------------------------------------
1971 (344) 10-Oct-05 M Make debug_print work in authenticators
1972 ------------------------------------------------------------------------------
1974 (345) 14-Oct-05 M Standardize rejection messages
1976 "The parsing for rejection lines is a bit of a mess, and fairly
1977 unmaintainable. Do you think it would be possible to standardise
1978 rejection/refusal log messages? How about something like:
1980 (<ID>|16 Spaces) *< (Connection|MAIL|RCPT|HELO|EHLO|DATA) rejected (from
1981 <Address>)?: <Reason> (\(<Detail>\))?"
1982 ------------------------------------------------------------------------------
1984 (346) 20-Oct-05 S Set $domain and $local_part in retry matching
1986 Currently, these variables are unset. Make it like rewrite matching.
1987 ------------------------------------------------------------------------------
1989 (347) 15-Nov-05 M Arrange to expand data from wildlsearch
1991 This would allow keys that are regular expressions to set up numerical
1992 variables that are included in the data. This has to be done inside the lookup
1993 code, because of caching. Probably means we have to invent ewildlsearch and
1995 ------------------------------------------------------------------------------
1997 (351) 31-Mar-06 ? Allow some/all/a few internal variables to be set
1999 The original idea was to allow "set authenticated = x" to pretend a connection
2000 is authenticated after other conditions are true. This can, of course, be
2001 packaged up using macros in other ways. Setting other variables could cause
2003 ------------------------------------------------------------------------------
2005 (352) 04-Apr-06 S Add +accept_defer for host lists (and maybe others)
2007 At present, a defer causes a delivery defer. For non-critical ACLs there are
2008 times when it may be better to accept. See also 226 and 289.
2009 ------------------------------------------------------------------------------
2011 (354) 30-Jun-06 ? Extensions to SMTP error codes
2013 A number of ideas arose following a discussion on the mailing list. I record
2014 them here so that they don't get lost. The motivations were to support the 551
2015 bounce code and enhanced status codes. Suggestions are to add a new ACL
2016 feature, possibly one of:
2019 control = errorcode=551
2022 where in the last case, it's recognized by being 3 digits. In all cases, the
2023 first digit must be "right" for the circumstance - ignore or fault if not?
2025 To handle ESC, perhaps a new variable called $smtp_errorcode, settable by an
2026 option in a router when it fails, would do the trick. It could be used in any
2027 of the above modifiers.
2028 ------------------------------------------------------------------------------
2030 (355) 30-Jun-06 ? Facility to permit experiments with SMTP extensions
2032 This is what was suggested:
2034 - adding some expansion variables: $ehlo_extensions (which will
2035 hold the remote server supported smtp extensions announced
2036 in the ehlo) and $rcpt_arguments with any RCPT extra argument
2038 - a main configuration option for adding ehlo extensions to the
2039 ehlo response, like:
2041 extra_ehlo_extensions = XFOO : XBAR
2043 - a extra option for the smtp transport to add arguments to
2044 the RCPT TO command, like:
2046 rcpt_args = FOO=BAR (will make exim issue RCPT TO:<a@b.c> FOO=BAR
2047 when delivering that message)
2049 - a new acl for unknown smtp commands
2051 This should be very simple to implement and will allow to make
2052 some experiments and implement custom extensions, i.e. one to
2053 known if remote client will redirect on 551 or not. Also the acl
2054 for unknown smpt command could be used for other purposes, like
2055 to dectect and react to some kiddies that send things like
2056 http://... on the smtp port.
2057 ------------------------------------------------------------------------------
2058 --- HWM 355 ------------------------------------------------------------------
2059 ---------------------------- End of WishList ---------------------------------