Added $smtp_active_hostname as a variable, and used it in smtp_banner
[exim.git] / doc / doc-misc / WishList
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f7b63901 1$Cambridge: exim/doc/doc-misc/WishList,v 1.15 2004/12/17 14:52:43 ph10 Exp $
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2
3EXIM 4 WISH LIST
4----------------
5
6Even when it was first released, Exim 4 had a Wish List because not all the
7things suggested for it were implemented. The list has not stopped growing...
8
9Another reason it is so long is that I have retained some items from the Exim 3
10Wish List that never got implemented, but which seem reasonable possibilities
11for later addition to Exim 4.
12
13I have guessed at the amount of work involved, and categorized the items as
14Tiny, Small, Medium, Large, or Unknown. The guesses are not based on any
15detailed investigation, so must be taken as very rough.
16
17
18------------------------------------------------------------------------------
19------------------------------------------------------------------------------
20----- Retained from the Exim 3 Wish List ------
21------------------------------------------------------------------------------
22------------------------------------------------------------------------------
23
24(10) 13-Jul-98 M more flexibility for pipe returns
25Ben Smithurst
26
27The ability to specify more precisely what happens concerning the return code
28from the pipe and the presence/absence of STDOUT/STDERR is requested. The
29particular configuration that was requested was:
30
31> if the command exited EX_OK, *and* produced nothing on STDOUT or
32> STDERR, it succeeded...
33> if the command exited EX_TEMPFAIL, defer, regardless of
34> STDOUT/STDERR...
35> otherwise freeze the message (this will get my attention by way of
36> freeze_tell_mailmaster)...
37------------------------------------------------------------------------------
38
39(11) 17-Jul-98 G support for DSN
40Andy Mell
41
42It is unclear to me how this should work in the presence of aliases and
43forwarding. Local deliveries would have to explicitly configured as deliveries
44or relaying or whatever. A substantial amount of code is probably needed.
45
46Jeffrey Goldberg
47I have nothing to add except to say that for many of the reasons you've
48stated, I don't think that DSN is coherent enough to be worth the effort
49to implement.
50
51Another comment:
52
53 I thought the RFC was pretty clear on this. In a nutshell, if the
54 delivery rewrites the envelope from address, it's considered a
55 terminal delivery (i.e. delivery to a mailing list exploder), otherwise
56 treat it as a forwarding operation (the /etc/aliases case). I would
57 treat a .forward expansion as a final delivery event (it got to the
58 user as far as the MTA is concerned).
59
60 Yes, we need the DSN syntax. We also require the complete semantics of
61 NOTIFY=SUCCESS,FAILURE for our application to work.
62
63 Electronic Bill Presentment is really going to push the need for
64 DSN support in MTAs. We just don't want to get stuck in a situation
65 where we're faced with a non-DSN-aware MTA when we go to install
66 our bill/statement engine, thus our interest in what the MTA vendors
67 are planning to do about DSN.
68------------------------------------------------------------------------------
69
70(41) 14-Oct-98 M Find a way of modifying header lines
71Oliver Smith
72
73The problem with header_remove followed by header_add is that you can't refer
74to the previous value of the header when adding a replacement. This could be
75solved with a replace_header option.
76------------------------------------------------------------------------------
77
78(43) 15-Oct-98 M Sender rewrite *after* SMTP incoming checks
79Andreas Edler
80
81The anti-relaying check happens after the sender has been rewritten; there are
82times when it would be helpful to do the check on the original sender, not on
83the rewritten one. Quite how to configure this I'm not sure.
84
85A related suggestion (from Steve Sargent) is to retain the original sender
86address and make it accessible somehow.
87------------------------------------------------------------------------------
88
89(46) 20-Oct-98 L SMTP protocol hooks
90Malcolm Ray
91
92"But there are enough broken SMTP implementations to make me wonder whether
93there isn't a case for providing hooks for tweaking the SMTP transport's
94protocol exchange. Something which would allow me to say things like 'if, when
95talking to lame.example.com, you get a 251 response to a MAIL command, rewrite
96the response to 501 before continuing'."
97------------------------------------------------------------------------------
98
99(50) 13-Nov-98 M A "Focus" option for eximon
100Frank Elsner
101
102This is the opposite of "Hide"; it just displays a certain subset. Hmm. Could
103something clever be done with regular expressions?
104------------------------------------------------------------------------------
105
106(61) 22-Dec-98 M Send failed error messages to somebody
107Harald Meland
108
109With sendmail, the failed error message is made into a error message,
110with both envelope sender and recipient set to MAILER-DAEMON. The
111original, bogus-envelope-sender message is then available to whoever
112receives MAILER-DAEMON's mail. A more flexible approach would be to
113specify a specific recipient.
114------------------------------------------------------------------------------
115
116(81) 01-Mar-99 M Addition of Content-MD5 support
117Martin Hamilton
118
119Martin supplied a suggested patch at
120http://www.net.lut.ac.uk/~martin/antispam/exim-hacks/
121------------------------------------------------------------------------------
122
123(85) 15-Mar-99 M ability to rewrite addresses in non-standard headers
124Dave Lewney
125John Holman
126
127Such as "return-receipt-to". See also 41.
128------------------------------------------------------------------------------
129
130(90) 21-Apr-99 M change wild prefix/suffix greediness
131Ben Smithurst
132
133Currently, when prefix or suffix containing * is set on a director, and the
134fixed part occurs more than once in a local part, the length of the prefix or
135suffix is maximized. For example, with suffix = -* and a local part of
136foo-bar-baz the suffix is taken as bar-baz, leaving the local part as foo.
137An option is proposed to invert this rule.
138------------------------------------------------------------------------------
139
140(91) 26-Apr-99 S make queue_run_in_order to newest first
141"Andreas M. Kirchwitz"
142
143The tidiest thing would be to have queue_run_order={random,oldest,newest},
144and make queue_run_in_order obsolete.
145------------------------------------------------------------------------------
146
147(93) 04-May-1999 L fallback_transport
148
149This would be a generic transport option, specifying a different transport to
150be used if the first one failed. Failed hard, or failed soft? Or an option?
151And if failed hard, is a bounce message sent as well, or not? There are uid
152issues. Remote delivery would have to be done always in a subprocess so that
153the main process could retain privilege in case the fallback transport was
154local. That could be conditional. That's why this is labelled "Large". Some of
155the things people want to do with this can be done by variations in the
156routers, e.g. use $message_age to switch routers.
157------------------------------------------------------------------------------
158
159(94) 13-May-1999 M message to go with -Mg
160Dave Holland
161Alan Thew
162
163So the admin can pass back a reason.
164------------------------------------------------------------------------------
165
166(99) 28-May-1999 M header to list failures for syntax_errors_to
167mark david mcCreary
168
169"I use the syntax_errors_to feature to email a copy of the error message.
170It would be helpful to have the X-Failed-Receipients header in there,
171identifying which addreses(s) are the problem, so that I don't have to
172parse the body of the email message to figure out which addresses."
173------------------------------------------------------------------------------
174
175(100) 04-Jun-1999 S admin_users option, like trusted_users
176Paul Mansfield
177------------------------------------------------------------------------------
178
179(102) 21-Jun-1999 M expanded basic variables
180Julian King
181
182Oh, and a wishlist entry, qualify_domain, and preferably other variables
183can be set with a $lookup in the first part of the exim configuration
184file, perhaps by an equivalent to backticks in shell script ("`command`")?
185------------------------------------------------------------------------------
186
187(105) 28-Jun-1999 M MIME-format bounce messages
188Paul Makepeace
189
190"Is there any work going/gone on/planned to enable exim to report delivery
191status notifications using RFC1892 multipart/report MIME messages? It would be
192great to have errors reported in a message/rfc822 attachment."
193
194Jeffrey Goldberg
195"I like plain bounces, so would hope that if you do this, that it be
196configurable. I think that even for those who want it, it shouldn't be very
197high on the wish list priority."
198
199Other suggestions: toggle for bounces/warnings; override max_return for
200certain addresses; use plain text if original not MIME. See Paul's hack
201for background of what to do.
202
203Nigel suggests using a specially named autoreply transport to generate bounces;
204people could then replace this with another transport (e.g. pipe) if they want
205to customize it themselves.
206
207Eli Chen posted an unconditional patch for 3.32 that does some of this work.
208That could form a basis.
209------------------------------------------------------------------------------
210
211(107) 12-Jul-1999 S defer transport at given load level
212Marc Haber
213
214------------------------------------------------------------------------------
215
216(108) 16-Jul-1999 S remote sort by numbers of recipients
217mark david mcCreary
218
219In the absence of remote_sort, sort remote domains by the number of recipients
220in each.
221------------------------------------------------------------------------------
222
223(114) 11-Nov-1999 S List of possible outgoing interfaces
224
225Allow the smtp "interface" option to be a list: try them in turn until one
226is found to work. Also allow masks to specify a range of addresses.
227------------------------------------------------------------------------------
228
229(123) 23-Dec-1999 L Use AUTH + TURN for dial-in hosts
230Andrew Tverdokhleb
231
232The way to do this would be to have Exim deliver messages into per-host
233directories in, say, BSMTP format. Accept TURN if authenticated, and cause it
234to run a helper program that is passed the socket in order to deliver the mail.
235Provide a helper program!
236------------------------------------------------------------------------------
237
238(125) 04-Jan-2000 L Use shared memory segment for queue list
239Theo Schlossnagle
240
241The idea is that a queue-runner that finds no existing shared segment should
242create one (if configured - possibly some fixed size) and all Exim processes
243should maintain a list of messages in it, thereby saving on directory scans
244when there are lots of messages. This needs a lot of careful thought to try to
245eliminate any possibility of data loss. The interlocking could be quite tricky.
246Further posters suggested using a db file to hold the list. See also 127.
247------------------------------------------------------------------------------
248
249(129) 14-Jan-2000 L Dynamically loadable lookup modules
250Steve Haslam
251
252Suggested patch provided.
253------------------------------------------------------------------------------
254
255(131) 17-Jan-2000 T Facility for assuming existence for EACCES
256Peter Radcliffe
257
258The opposite option for "+" in require_files: assume existence if cannot
259peer into the directory (+ assumes non-existence).
260------------------------------------------------------------------------------
261
262(131) 29-Feb-2000 M? Control total number of outgoing SMTP calls
263Brian White
264
265This is for hosts with slow connections. Could some modification of
266serialize_hosts be used for this? Or maybe use a semaphore? They seem to
267be quite widely available.
268------------------------------------------------------------------------------
269
270(132) 01-Mar-2000 S Lookup host name from outgoing interface
271Vadim Vygonets
272
273Instead of primary_hostname, look up the name for the interface that is being
274used for sending. Suggested patch supplied, but this should be an option of the
275smtp transport.
276------------------------------------------------------------------------------
277
278(133) 06-Mar-2000 S Filter option not to log "previously sent"
279Bruce Bowler
280
281This is when using the "log" option of the autoreply driver.
282------------------------------------------------------------------------------
283
284(134) 09-Mar-2000 S Option to remove attachments when bouncing
285------------------------------------------------------------------------------
286
287(136) 13-Mar-2000 S/M Option for aliasfile to suppress "me too"
288
289Could be tricky determining who "me" is.
290------------------------------------------------------------------------------
291
292(143) 08-May-2000 S Make quota_warn_threshold into a list
293David Carter
294
295So several warnings could be generated as the mailbox got bigger and bigger.
296------------------------------------------------------------------------------
297
298(146) 15-May-2000 M Allow SMTP error codes in retry rules
299
300This would allow special handling of certain errors from certain hosts. In
301particular, it would allow failing of certain 4xx codes.
302
303This is now available for 4xx responses to RCPT commands. Is anything more
304needed?
305------------------------------------------------------------------------------
306
307(148) 15-May-2000 S Warn recipient if message rejected for quota excession.
308Heinz Ekker
309
310Maybe not all that small, because the possibility of retrying must be taken
311into account.
312------------------------------------------------------------------------------
313
314(149) 19-May-2000 L Make added headers visible in filters and other places
315Hans Morten Kind
316
317Headers added by directors/routers are not visible in subsequent processing.
318This is a request to make them visible. What about removed headers? This could
319be tricky to specify, hence the L.
320
321A separate but related issue is the effect of headers added by "unseen"
322directors. These are documented in chapter 19 as not being accumulated. Should
323any change be made?
324------------------------------------------------------------------------------
325
326(155) 16-Jun-2000 M Special handling for certain hosts
327mark david mcCreary
328
329A means of changing the transport depending on the host name/IP of the most
330preferred MX record so that all domains that route to certain hosts can be
331handled specially. Maybe this could be a variable that is available in the
332expansion of the "transport" option.
333------------------------------------------------------------------------------
334
335(158) 29-Jun-2000 S Configure "From" in bounces
336Ben Parker
337
338Cf Reply-To.
339------------------------------------------------------------------------------
340
341(159) 07-Jul-2000 M Keep messages for fixed time
342Gary Palmer
343
344An option to keep messages on the queue for a specified time, even if all their
345destination hosts have timed out.
346------------------------------------------------------------------------------
347
348(164) 17-Aug-2000 S sender_unqualified_auth_hosts
349
350To allow authenticated hosts to send unqualified addresses. Presumably it
351needs received_... as well.
352------------------------------------------------------------------------------
353
354(167) 05-Sep-2000 L Support for ODBC
355
356This would allow access to databases that don't have native support built into
357Exim. See http://www.openlinksw.com/info/docs/rel3doc/unix/odbcsdk.htm
358------------------------------------------------------------------------------
359
360(168) 06-Sep-2000 M Deliver messages that alias to nothing to a given address
361Dr ZP Han
362
363If other people are managing alias lists, and one is empty, bounce that
364delivery to a given address rather than freezing the message. Use the errors_to
365address?
366------------------------------------------------------------------------------
367
368(172) 11-Sep-2000 S Allow file/directory in appendfile to override
369"Michael J. Tubby"
370
371When appendfile is called from forward or filter files, it ignores file or
372directory settings. Maybe they should override. The path set by the forward or
373filter is available in $address_file these days, so it could be used to create
374a longer path.
375------------------------------------------------------------------------------
376
377(173) 18-Sep-2000 S A way of doing lsearches with EOL terminated keys
378Jason Robertson
379
380This is for looking up things like subject contents. Probably need an option to
381exim_dbmbuild to make them into DBM files.
382------------------------------------------------------------------------------
383
384(174) 19-Sep-2000 S A way of using a different port for fallback hosts.
385Dean Brooks
386------------------------------------------------------------------------------
387
388(181) 10-Nov-2000 S Compile-time options for ignoring Sendmail options
389
390So that new ones could be accommodated easily.
391------------------------------------------------------------------------------
392
393(183) 04-Dec-2000 L dns_means_nonexist_after
394Dave C.
395
396In other words, wait a bit before giving up. This needs a mechanism for
397remembering, which is not currently available. To be borne in mind for the
398future.
399------------------------------------------------------------------------------
400
401(184) 04-Dec-2000 M Log more details of local caller
402J. Nick Koston
403
404"I was wondering if it was possible for exim to log the parent pid's cwd and
405exe when it is called from a script/invoked by actually running /usr/sbin/exim
406or /usr/sbin/sendmail." Question: is this information actually/easily
407available to Exim? Needs investigation.
408------------------------------------------------------------------------------
409
410(186) 19-Dec-2000 S A simple utility to reset a retry time
411Marc Haber
412
413Basically, to do what exim_fixdb "delete" can do, but straightforwardly. There
414could be an interface from eximon.
415------------------------------------------------------------------------------
416
417(187) 02-Jan-2001 M Wildcarding in headers_remove
418Tamas TEVESZ
419
420What I'd like to see is it to handle globs (or regexps, but i'm not sure this
421latter would worth the hassle), in a way like:
422
423 headers_remove = "X-*:Additional-header"
424------------------------------------------------------------------------------
425
426(188) 02-Jan-2001 S Make pipe timeout a temporary error
427Georg v.Zezschwitz
428
429A way to make a timeout into a temporary error.
430------------------------------------------------------------------------------
431
432(190) 03-Jan-2001 M Multiple message operations in eximon
433------------------------------------------------------------------------------
434
435(195) 19-Mar-2001 T TCP window size
436
437TCP window size for receiving/sending, SMTP client/server.
438------------------------------------------------------------------------------
439------------------------------------------------------------------------------
440
441
442
443------------------------------------------------------------------------------
444------------------------------------------------------------------------------
445----- Things that didn't make it into Exim 4 ------
446------------------------------------------------------------------------------
447------------------------------------------------------------------------------
448
449. An option to send messages to postmaster when ignore_errmsg_errors_after
450times out.
451
452. When an address is being routed, its constituents are in $local_part and
453$domain, but there is currently no variable that contains the whole thing. It
454could be put into $recipient, but that risks confusion with $recipients
455(which is available in system filters). Maybe $address could be used?
456
457. The ability to relay to host X without knowing all the domains that host X
458might have. At ACL time, one would need to verify the recipient, and determine
459that it routed to host X.
460
461. A new lookup library that operates on a specially prepared file of IP
462addresses and masks so that a single "lookup" yields a yes/no answer. This
463should be a freestanding thing - needs a utility to build the file from a list.
464
465. People want to change the wording of messages; can we find an efficient way
466of allowing this? (Maybe put all messages into a separate module?) The problem
467is not in the messages themselves, but in the values that get inserted into
468messages. Would have to invent a new kind of function that used identified
469values rather than positional ones. Use GNU gettext?
470
471. Invent lf_hosts for those that may use LF without CR. Any other RFC
472things we need to worry about?
473
474. A user would really like to see something similar, perhaps with
475"ID=$authenticated_id", similar to "helo=" and "ident=" in the default received
476header. BUT there are security issues. Maybe give it as a commented out option
477in the default configuration?
478
479. Consider expanding further options that take integer values. What about
480smtp_xxx options for different limits at different times of day (for example)?
481What about tls_advertise_hosts (so can look at incoming IP/port)?
482
483. How about a "hold hosts" option (cf hold_domains) to hold delivery to certain
484hosts?
485
486. Allow user filters to use "headers add", but probably not remove. Or maybe
487just implement "allow" options for both of these features.
488
489. Have the return from pipe in a variable, so that (e.g. error_message_file)
490can make use of it.
491
492. Implement randomize for ldap/sql servers.
493
494. Add an option for ETRN that says "wait for the command to finish, and use its
495stdout as the SMTP response."
496
497. -odsomething for "ignore retry when doing immediate delivery".
498
499. Add an option to the smtp transport to make it treat 5xx on connection as if
500it were 4xx. Or possible add a sophisticated "after command X, treat xxx as
501yyy".
502
503. A way of rewriting addresses in non-standard header lines such as
504Mail-Followup-To.
505
506. Global option to enable initgroups() for exim uid. Default off.
507
508. When verifying a sender, should it be rewritten with any T rewrites, because
509it would be so rewritten if it actually was a recipient in a message?
510
511. Sean Witham wants a way of defining macros that are not privileged, and a
512sort of #ifdef structure that allows for different configurations in the same
513file.
514
515. Allow :fail: to specify that 551 be used instead of 550. Maybe allow a code
516at the start, optionally? What about :defer:?
517
518. SMTP timeout in middle of receiving message: log sender address if known, and
519possibly message_id if known.
520
521. Make -brw show rewrites for transports too.
522
523. Have the MTA log destinations that have timed-out on a ident request and
524no longer send rfc1413_queries to them. Add an option for how not to cache
525these entries.
526
527. Options and/or a utility to enable non-privileged users to view the queue
528(e.g. -bpp), manipulate their own messages, etc.
529
530. Specify a port along with a host in a route_list.
531
532. A generalized "From" escaping scheme that also escapes >From so that the
533whole thing can be reversed.
534
535. There was a request for the \dns_again_means_nonexist\ option not to be
536instantaneous, but to operate only after the DNS has been giving "try again"
537for some time. Use the misc hints database.
538
539
540
541------------------------------------------------------------------------------
542------------------------------------------------------------------------------
543----- The Exim 4 Wish List ------
544------------------------------------------------------------------------------
545------------------------------------------------------------------------------
546
547(1) 01-Jan-02 U Use of dynamically loaded libraries.
548
549People want Exim to use dynamically loaded modules for a variety of reasons.
550When I started to create Exim, I never expected anything other than source
551distribution; the RPMs and inclusions in OS distributions caught me by
552surprise. I know very little about the mechanics of dynamic loading, but I'm
553aware that not all operating systems support it. I'm also aware that not all
554people support it!
555
556Furthermore, a way round this might be to supply more hooks along the lines of
557local_scan(). Then people can write their own dynamic loaders if they want.
558------------------------------------------------------------------------------
559
560(3) 01-Jan-02 U Test for over-quota at SMTP time
561
562This is a hard one, because the only way to test for over quota is to try to
563deliver a message, certainly if system quotas are being used. And also, the
564only available size at RCPT time is the SIZE option, though of course the test
565could be run at DATA time. I think maybe we leave this one to an external
566program, and require people to use ${run} to access the data. Let someone else
567figure out how to extract the current mailbox size!
568
569One suggestion is to implement
570
571 ${file_size:/path/to/file}
572 ${directory_size:/path/to/directory}
573
574so that explicit checks can be done. It may be necessary to have four
575operators, two being based on the block count, and two showing the "visible"
576size. Directory scanning is expensive; is there any scope for caching? It would
577seem not (you don't often get two addresses to the same user).
578------------------------------------------------------------------------------
579
580(4) 01-Jan-02 S Option to reject if no From: or Date: header line
581
582Exim, in common with many other MTAs, inserts a From: or Date: header line if
583one is missing. (It also inserts a blank Bcc:, but that is no longer needed by
584RFC 2822 - it was by 822.) The suggestion is an option to give an error
585instead. This could be done by making it possible to detect these insertions in
586the acl_smtp_data ACL.
587------------------------------------------------------------------------------
588
589(6) 01-Jan-02 S Option to disable the use of -t
590Dave C.
591
592Would require work so that Exim itself doesn't use -t.
593------------------------------------------------------------------------------
594
595(7) 01-Jan-02 M Avoid showing LDAP passwords in log lines for LDAP errors
596John W Baxter
597
598May be tricky, because at the higher levels, the format of the query is not
599understood.
600------------------------------------------------------------------------------
601
602(8) 01-Jan-02 S Expand once_repeat in autoreply
603John Jetmore
604------------------------------------------------------------------------------
605
606(9) 01-Jan-02 S Headers as well as body in file for autoreply
607Florian Laws
608------------------------------------------------------------------------------
609
610(10) 01-Jan-02 T Make "true" and "false" valid expansion conditions
611
612This might help with "and" and "or" when one of the sub-conditions is, for
613example, a lookup.
614------------------------------------------------------------------------------
615
616(11) 01-Jan-02 S Allow a filter to include another file.
617------------------------------------------------------------------------------
618
619(12) 01-Jan-02 M Support for different SQL servers per query
620
621In other words, the global mysql_servers etc. is too restrictive.
622------------------------------------------------------------------------------
623
624(14) 01-Jan-02 M? Support for Sendmail milters
625
626This could perhaps be done by extending the local_scan() idea and providing a
627"standard" module which interfaced to milter.
628------------------------------------------------------------------------------
629
630(15) 01-Jan-02 M More hooks like local_scan()
631
632One request has been for a similar hook at logging time. For other SMTP
0cf417c5 633interactions, maybe a hook into the ACL? See also 79 and 218 and 301.
e05f33e0
PH
634------------------------------------------------------------------------------
635
636(17) 11-Jan-02 M The construction of config.h needs refactoring
637
638This has been hacked about substantially since the original implementation.
639Given that there is a program (buildconfig), the messing around with the
640environment could be abolished. Also, the distinction between "yes" and "no"
641isn't always properly made (tests for #ifdef don't care about the value).
642------------------------------------------------------------------------------
643
644(18) 24-Jan-02 S Make $value retain its value after a top-level expansion
645
646This was specifically for use in filter files. Currently it reverts to empty
647as a consequence of save/restore for every lookup. It might be confusing to
648do otherwise, however.
649------------------------------------------------------------------------------
650
651(19) 29-Jan-02 L Use of multiple DBM libraries
652
653The problem is how to handle conflicting function names. Much research is
654needed.
655------------------------------------------------------------------------------
656
657(20) 29-Jan-02 S Make system filter refreeze after manual thaw
658
659Currently, a "freeze" in a system filter doesn't freeze after a manual thaw.
660------------------------------------------------------------------------------
661
662(21) 12-Feb-02 S Expand return_size_limit
663Joachim Wieland
664
665Is this really worth it? A per-transport value is also suggested - that would
666mean remembering the value with each failed address and taking a minimum or
667a maximimum (which?).
668------------------------------------------------------------------------------
669
670(24) 21-Feb-02 ? A way of testing TLS using -bh
671------------------------------------------------------------------------------
672
673(27) 06-Mar-02 M Distinguishing between different temporary callout errors
674
675The request was to distinguish between a 4xx error and a failure to connect.
676Problem is: how to cope when there is more than one host? Maybe only if ALL
677fail to connect. An option like /callout_no_connect_ok.
678------------------------------------------------------------------------------
679
680(30) 12-Mar-02 S Add "recipients" precondition to routers.
681
682This would avoid having to use "condition". (See also requirement for $address
683mentioned above.) However, it would also require adding a caching feature, and
684probably $recipient_data (cf $domain_data).
685------------------------------------------------------------------------------
686
687(31) 21-Mar-02 S Variables that indicate 8-bit message and 8-bit host, and
688 a way of using them to suppress a transport filter
689
690A variable that is set if the message contains 8-bit characters, and another
691that is set during the smtp transport if the host supports 8-bit. Then we also
692need a condition that's expanded in the transport to control whether the filter
693is run or not (e.g. transport_filter_condition).
694------------------------------------------------------------------------------
695
696(32) 22-Mar-02 M More info about callout fails for header sender verify
697
698When there's a callout failure for an envelope address, the error message
699contains details (by default) of the callout commands. This doesn't happen
700for addresses in the header because there may be more than one of them, and
701deciding how to give that information is tricky. Can we do better?
702------------------------------------------------------------------------------
703
704(33) 25-Mar-02 S Option to assume nomatch in dnslist lookups that time out
705
706Currently this causes a DEFER.
707------------------------------------------------------------------------------
708
709(34) 26-Mar-02 S Access to DNS lookup functions via local_scan() API
710
711This would make local_scan() writers lives easier for DNS usage.
712------------------------------------------------------------------------------
713
714(36) 02-Apr-02 ? A way of throttling, but allowing, relaying that would
715 otherwise be denied
716
717This was suggested in connection with anonymizing messages. The "wait" command
718in ACLs goes some way towards this. Is it enough?
719------------------------------------------------------------------------------
720
721(41) 17-Apr-02 T Make config.samples available as a directory for ftp
722
723This is so that people can browse individual samples directly.
724------------------------------------------------------------------------------
725
726(42) 23-Apr-02 T An option not to flatten newlines in $message_body.
727
728Or maybe better to provide $message_body_nl so as to have both.
729------------------------------------------------------------------------------
730
731(43) 23-Apr-02 T An option to treat 4xx as 5xx from STARTTLS
732
733This would make Exim retry in clear unless the host is in hosts_require_tls.
734------------------------------------------------------------------------------
735
736(44) 24-Apr-02 ? Use errors_to for timeouts after redirect syntax errors
737
738A syntax error in redirection data (with skip_syntax_errors false) causes a
739defer. Eventually, the address may time out. This suggestion is that, when it
740does, the bounce is sent to errors_to rather than to the sender.
741------------------------------------------------------------------------------
742
743(45) 13-May-02 T smtp_etrn_serialize_id = ....
744
745The default behaviour would be equivalent to
746
747 smtp_etrn_serialize_id = $smtp_command_argument
748------------------------------------------------------------------------------
749
750(47) 16-May-02 S Access to all addresses in batched local delivery
751Miquel van Smoorenburg
752
753In a batched local delivery with more than one recipient, there's no way to
754access the list of recipients for doing custom things, such as stuffing them
755all into a header. (BSMTP is the only approach; not everybody can use it.)
756Suggested patch supplied.
757------------------------------------------------------------------------------
758
759(48) 21-May-02 M Support for ATRN (server and client)
760Brian Candler
761
762Server: If Exim had the ability to accept an ATRN command and then simply
763invoke an external program, passing the SMTP stream on stdin and stdout and
764the authenticated id as a parameter, that would do the job nicely.
765
766Client: We need a variant of 'exim -bs' which would connect to a specified
767host, send AUTH/ATRN, and then accept incoming messages as usual.
768------------------------------------------------------------------------------
769
770(50) 22-May-02 T Add comment (duplicate address) to Envelope-To:
771
772This is just to minimize the confusion some people have.
773------------------------------------------------------------------------------
774
775(51) 07-Jun-02 S Option to use another address in callout MAIL FROM
776
777This would be an address to try if MAIL FROM:<> failed. Is this actually going
778to be helpful? See also 101.
779------------------------------------------------------------------------------
780
781(53) 11-Jun-02 S Make local_scan() dynamically loadable
782
783David Woodhouse sent a patch. There's a more sophisticated one from Marc
784Merlin. (See also Peter Benie's comments.) But should the base Exim have all
785this in it?
786------------------------------------------------------------------------------
787
788(54) 11-Jun-02 S Ignore -Ac if called as mailq
789
790I am not sure if this makes sense. This flag requests a listing of a different
791mail queue, but Exim doesn't work like that. Is is not better for people to be
792aware of this?
793------------------------------------------------------------------------------
794
795(55) 13-Jun-02 M Rewriting whole header lines
796Dave C.
797
798Current rewriting rules apply to individual addresses in header lines. This
799feature would use a regex to match whole lines and replace them. It could be
800useful for patching up syntactically invalid lines from crappy clients, before
801the syntax check kicks in. (It might also be useful for hiding local host names
802in Received: headers.)
803------------------------------------------------------------------------------
804
805(58) 26-Jun-02 ? Extend PAM support
806
807Apparently PAM can do challenge-response authentication. The Exim interface
808can't handle this. Investigate and think about how to do this.
809------------------------------------------------------------------------------
810
811(59) 26-Jun-02 M A "custom" authenticator
812
813... that is simply a front end to external code. For example, there may be
814an external API that hides the user password and does CRAM-MD5 when passed the
815details of the challenge and response.
816------------------------------------------------------------------------------
817
818(60) 27-Jun-02 S Make trusted_users a local part list
819
820So that it can use lsearch etc.
821------------------------------------------------------------------------------
822
823(62) 28-Jun-02 S Remove headers before DATA ACL
824Patrice Fournier
825
826"I'd like to be able to give Exim a list of headers that must be removed
827from the message at arrival, before data_acl processing (and before the
828rcpt_acl warn headers are added to the message)."
829------------------------------------------------------------------------------
830
831(63) 28-Jun-02 S Access to ACL-added headers in ACLs
832Patrice Fournier
833
834"I'd like also to be able to look at the already added headers by a
835rcpt_acl when still checking rcpt_acl (either later in the acl for the same
836RCPT TO or for another RCPT TO)."
837------------------------------------------------------------------------------
838
839(65) 28-Jun-02 M Expand fallback hosts
840
841See also 174 of the Exim 3 list.
842------------------------------------------------------------------------------
843
844(66) 01-Jul-02 M Use Berkeley DB 4 concurrent access features
845
846This might give better performance on very busy sites by reducing the
847contention for access to hints databases. Rob Butler points out that this could
848also be useful to allow updates of other DB files used by Exim to happen
849concurrently. Another thing to think about with BDB is the possible use of
850B-trees.
851------------------------------------------------------------------------------
852
853(68) 01-Jul-02 S Add sender host to delivery line
854
855"Would it be possible to have a "sending_host_on_delivery" option that
856logs the IP of the sending host in the => line?" Also requested was amount of
857data transmitted for a non-delivery attempt.
858------------------------------------------------------------------------------
859
860(69) 03-Jul-02 T Log selector to log whoson checs
861Matt Bernstein
862
863"I'd quite like a log_selector option which could spot you'd done a whoson
864lookup in your DATA ACL and maybe log it as W=user."
865------------------------------------------------------------------------------
866
867(70) 09-Jul-02 S A way of changing the RCPT address in an accept router
868
869So as to avoid duplication problems when sending multiple addresses in multiple
870copies to the same address.
871------------------------------------------------------------------------------
872
873(73) 17-Jul-02 M Match a list from within a condition
874
875e.g. ${if matchdomain {$domain}{+domainlist} ...
876 ${if matchhost {$sender_host_address}{1.2.3.4/10:2.3.4.5/16}...
877
878Thought needed about how to handle host names. This may be too messy to specify
879cleanly.
880
88122-Apr-04: Implemented for domains, addresses, and local parts. Hosts are
882too messy!
f7b63901
PH
883
884The only sensible approach seems to be to allow IP address arguments only.
885Anything else should be diagnosed as an error. However, if a name appears in
886the list, a PTR lookup should be done. This may require a lot of refactoring
887in the code.
e05f33e0
PH
888------------------------------------------------------------------------------
889
890(74) 22-Jul-02 M Extend -bV to do more semantic checking
891
892For example, diagnose "local_hosts" that should probably be "+local_hosts".
893------------------------------------------------------------------------------
894
895(75) 23-Jul-02 S Reference option on command line
896
897The idea here is that a spam scanner that re-injects a message can supply a
898reference on the command line that gets logged with R=.
899------------------------------------------------------------------------------
900
901(78) 30-Jul-02 S Expand queue_only (and/or queue_only_file)
902
903The requirement is to make it possible to queue messages if certain conditions
904are met (e.g. messages from certain local users). See also 93.
905
906This control can now be achieved in the ACL - is this still needed?
907------------------------------------------------------------------------------
908
909(79) 31-Jul-02 S Additional info for log lines
910
911An option to set an expanded string to be added to <= lines. And also for the
912other delivery lines? See also 15.
913------------------------------------------------------------------------------
914
915(84) 09-Aug-02 S Make interfaces available in a variable
916
917Something like $local_interfaces. Maybe limit the max length.
918------------------------------------------------------------------------------
919
920(85) 12-Aug-02 S/M Notice database connection failures
921
922The small version of this just removes a server from the list within a single
923Exim process when a connection to it fails. The bigger project would use the
924retry database - but that has implications for bottlenecking and may not be
925helpful. See also item 109. Another suggestion is to randomize the order in
926which database servers are tried (randomize_database_servers). And another is
927to measure response times and remember which server is fastest.
928------------------------------------------------------------------------------
929
930(87) 12-Aug-02 M Partial lookups for query-style lookups
931
932The suggestion is to allow the lookup to contain a keystring (same syntax as
933single-key lookups) which is then permuted and place in a suitable variable
934each time - $permuted_key or something.
935------------------------------------------------------------------------------
936
937(88) 20-Aug-02 S Allow special retrying for forced defer
938
939See also 146 in Exim 3 wish list above.
940------------------------------------------------------------------------------
941
942(89) 20-Aug-02 S Also allow retry rules on routers and transports
943------------------------------------------------------------------------------
944
945(90) 23-Aug-02 M Macros with arguments, a la C
946
947I don't like this, because of the cost of frequent interpretation.
948------------------------------------------------------------------------------
949
950(93) 27-Aug-02 S queue_only_condition
951Peter A. Savitch
952
953queue_only_condition global option, expanded string. This contain
954condition, which if evaluated to `no' or `false' or `0', behaves like
955queue_only (queue_only_load ?). Don't know what to do is the string
956expansion fails with DEFER (either force queueing or continue with
957immediate delivery). Another option can control Exim behaviour if the
958expansion fails. Don't know how the name for it ;-) See also 78.
959
960This control can now be achieved in the ACL - is the new feature now needed?
961------------------------------------------------------------------------------
962
963(95) 27-Aug-02 S Log all parents as a router option
964
965So that specific addresses can be logged like this. Should there be more log
966selector options per router? Per transport?
967------------------------------------------------------------------------------
968
969(99) 28-Aug-02 L Test pre-conditions in order given
970
971This would get round certain problems with require_files. However, it is
972totally incompatible, and therefore an "Exim 5" wish.
973------------------------------------------------------------------------------
974
975(101) 02-Oct-02 M Callout and <> rejections
976
977Some people don't want to fail the callout if the MAIL FROM:<> command is
978rejected. Think of a way of handling this tidily. See also 51.
979------------------------------------------------------------------------------
980
981(102) 03-Oct-02 M Log option to suppress message-id logging
982
983M because it would involve a change to eximstats.
984------------------------------------------------------------------------------
985
986(106) 09-Oct-02 S Appendfile to create directory not as user
987
988Arrange for the setup entry to appendfile to create the directory under some
989other uid (and with given owners/permissions?)
990------------------------------------------------------------------------------
991
992(109) 15-Oct-02 M Remember when LDAP (etc) servers are down
993
994The idea would be to use some kind of retry rule, just like for hosts.
995See also 85.
996------------------------------------------------------------------------------
997
998(110) 18-Oct-02 M errors_to for pipe command in filter
999
1000To work in the same was as errors_to for deliver commands.
1001------------------------------------------------------------------------------
1002
1003(113) 15-Nov-02 M support for XMLRPC
1004
1005Patch supplied for 4.10 by Joel Vandal.
1006------------------------------------------------------------------------------
1007
1008(114) 04-Dec-02 M local_scan: return message on accept
1009
1010(This actually dates from earlier.) The problem with this is that the string
1011currently passes into $local_scan_data. Thus, an incompatible change of some
1012sort would be required. Possibly a global that local_scan can set?
1013------------------------------------------------------------------------------
1014
1015(118) 10-Dec-02 S access to Perl from local_scan
1016------------------------------------------------------------------------------
1017
1018(119) 12-Dec-02 M ability to specify additional headers in an autoreply
1019
1020This is so that vacation messages etc can have MIME headers that specify, for
1021example, the character set.
1022------------------------------------------------------------------------------
1023
1024(125) 02-Jan-03 M Per-host daemon logging
1025
1026"So what I would like is an option like debug_hosts, that allows to specify
1027an hostlist, and if the current incoming/outgoing hosts matches, creates a
1028logfile like $hostname_(in|out).log in my logdirectory."
1029------------------------------------------------------------------------------
1030
1031(127) 06-Jan-03 M Different messages for different callout failures
1032
1033The real requirement here is to detect when a callout "MAIL FROM:<>" failed, so
1034that a specific warning about that can be sent, different to the message when a
1035callout "RCPT TO:" fails. I think this is in fact now mostly done.
1036------------------------------------------------------------------------------
1037
1038(129) 09-Jan-03 M Keep track of DNSBL timeouts, and refrain from calling
1039
1040If so configured, keep track of DNSBL timeouts in a hints record, and don't
1041retry that DNSBL for a while after (a sufficient number of) timeouts. It is
1042effectively disabled for a while. Log enable/disable, of course. Another
1043thought is an option not to apply +defer_unknown unless *all* DNSBL lookups in
1044a list defer.
1045------------------------------------------------------------------------------
1046
1047(130) 09-Jan-03 M A number of LDAP-related things
1048Peter A. Savitch
1049
1050OpenLDAP 2.1 is going to be more popular (2.1.9 is available with many
1051bug fixes). TLS-enabled LDAP is an interesting and usefull thing.
1052I can try to implement some things and send the patches, like with
1053ldapi.
1054
1055How do You see:
1056
10571) The propagation of TLS options (key, certificate, CA certificate)
1058 to the OpenLDAP library.
1059
10602) (was dereferencing; done in 4.23).
1061------------------------------------------------------------------------------
1062
1063(131) 09-Jan-03 S Additional variables
1064Peter A. Savitch
1065
1066$root_uid Why?
1067
1068(Some that were previously here are done)
1069
1070$smtp_accept_count -- used for acl_smtp_connect
1071
1072$queue_runners -- children of the listening daemon could use this
1073 value for controlling the number of queue runners
1074
1075I don't like either of these because they cannot be real-time values. They
1076would be snapshots of the values at the time the process was forked from the
1077daemon, and I fear they would just be confusing. For processes that were not
1078forked from the daemon they couldn't be set at all.
1079------------------------------------------------------------------------------
1080
1081(131) 09-Jan-03 S Additional options
1082Peter A. Savitch
1083
1084exim_processes_max
1085exim_file_descriptors_max
1086queue_run_condition -- to deprecate queue_run_max, better system
1087 load control
1088
1089Given Exim's distributed nature, I'm not at all sure how the first two of these
1090can usefully be implemented.
1091------------------------------------------------------------------------------
1092
1093(132) 16-Jan-03 M Option for when a transport filter fails (crashes)
1094
1095Freezing is one obvious option. Currently, Exim just retries. Another user
1096wanted to retry without the filter, but that is much harder.
1097------------------------------------------------------------------------------
1098
1099(136) 24-Jan-03 M Make "personal" available as a condition for use in routers
1100------------------------------------------------------------------------------
1101
1102(138) 28-Jan-03 M A variable containing what was matched in a host list
1103
1104Or, presumably, other lists. This is so that ACL messages can say things like
1105"your host name matches xxxx". Note: not the same as $domain_data. Also, this
1106could be tricky with lookups and things that match in files.
1107------------------------------------------------------------------------------
1108
1109(143) 06-Mar-03 L Ability to have multiple authenticators of same type
1110
1111For example, to have two PLAIN authenticators; if the first fails, try the
1112second.
1113------------------------------------------------------------------------------
1114
1115(144) 07-Mar-03 T ACL control = local_scan_skip to skip the local scan
1116
1117A bigger project would be control = local_scan <xxx> where xxx could select
1118different local_scan functions (possibly by dynamic loading).
1119
1120This can now be simulated using the fact that ACL variables are preserved,
1121so it doesn't look as it once did.
1122------------------------------------------------------------------------------
1123
1124(145) 07-Mar-03 T Export string_cat() to local_scan()
1125------------------------------------------------------------------------------
1126
1127(147) 17-Mar-03 T Option to treat 5xx as 4xx if received on initial connection
1128
1129This issue is controversial. That may be a good reason for not changing
1130anything.
1131------------------------------------------------------------------------------
1132
1133(153) 25-Apr-03 S A way of making log_as_local apply to the smtp transport
1134
1135Either an option on the transport, or log_remote_as_local for the router.
1136Messy, either way. Maybe log_local_as_local and log_remote_as_local, and
1137deprecate log_as_local?
1138------------------------------------------------------------------------------
1139
1140(154) 01-May-03 M Teergrubing at the CR/LF level
1141
1142It is believed that the most effective way to teergrube is to insert a delay
1143between transmitting CR and LF in the SMTP response. Furthermore, this is also
1144the best place to test for bad synchronization (i.e. at the last possible
1145time).
1146------------------------------------------------------------------------------
1147
1148(155) 01-May-03 S "control=no_pipelining" for connect and EHLO ACLs
1149
1150Yet more flexibility! Maybe this should be a more general control for what is
1151sent in response to EHLO.
1152------------------------------------------------------------------------------
1153
1154(156) 06-May-02 M Finer-grained synchronisation checking
1155
1156On operating systems that can be asked whether any sent bytes have not yet been
1157ACK'd at the TCP/IP level, a finer-grained check for proper synchronisation can
1158be done. All bytes must have been ACK'd if the client has received the previous
1159response before sending the next command. See also 293.
1160------------------------------------------------------------------------------
1161
1162(157) 07-May-03 M Newline as a list item separator
1163
1164This will make life easier for lists obtained form databases where the
1165separator is naturally a newline.
1166------------------------------------------------------------------------------
1167
1168(158) 13-May-03 M Ability to add to OK message for SMTP commands
1169
1170For sending reasons for slow response, etc.
1171------------------------------------------------------------------------------
1172
1173(160) 19-May-03 M Remove headers using wild cards
1174------------------------------------------------------------------------------
1175
1176(162) 28-May-03 M/L Use of real numbers in filters, expansions, and options
1177
1178The motivation for this is for handling spam scores that are real numbers. The
1179questions are (a) how widely should it spread and (b) whether floating point or
1180fixed point representations should be used. And what about the eval operator?
1181------------------------------------------------------------------------------
1182
1183(164) 02-Jun-03 S Set variables for interface and port in smtp transport
1184
1185These could be useful for varying HELO data etc. See also several other
1186items about interfaces above.
1187------------------------------------------------------------------------------
1188
1189(166) 18-Jun-03 S CN verification in client TLS code
1190
1191A tls_verify_cn option is suggested by Sven Geggus.
1192------------------------------------------------------------------------------
1193
1194(168) 19-Jun-03 S Ability to add a header recording envelope rewrites
1195
1196Current code adds a deleted header with only some information. Maybe what is
1197needed is a flag for a rewrite rule.
1198------------------------------------------------------------------------------
1199
1200(169) 19-Jun-03 M A way of detecting timeouts in callout returns
1201
1202------------------------------------------------------------------------------
1203
1204(170) 23-Jun-03 S Option to accept rather than defer after local scan timeout
1205
1206Suggested patch supplied.
1207------------------------------------------------------------------------------
1208
1209(171) 23-Jun-03 S Option to make timeout a soft failure on pipe transport
1210
1211------------------------------------------------------------------------------
1212
1213(172) 23-Jun-03 M Option to make SQL query to specific server
1214
1215------------------------------------------------------------------------------
1216
1217(175) 04-Jul-03 S show_all_ancestors_in_errmsg for the redirect router
1218
1219This is the opposite of hide_child_in_errmsg in effect.
1220------------------------------------------------------------------------------
1221
1222(180) 14-Jul-03 M Extend never_users to be more flexible
1223
1224e.g. never_users = ! mailnull : ! cyrus : !mailman : 0-100
1225------------------------------------------------------------------------------
1226
1227(183) 16-Jul-03 S freeze_tell_text to add custom text to the message
1228
1229------------------------------------------------------------------------------
1230
1231(185) 24-Jul-03 S An expansion operator that decodes RFC 2047 strings
1232
1233------------------------------------------------------------------------------
1234
1235(188) 13-Aug-03 T batch_max=0 to mean unlimited
1236
1237------------------------------------------------------------------------------
1238
1239(189) 22-Aug-03 S Allow filter "logwrite" to write to syslog
1240
1241I feel this is a dangerous facility, and also of very minority interest, at
1242least for user's filters. Allowing a system filter to write to mainlog or
1243syslog may be different. However, writing the main log would only be possible
1244if the filter runs as root or exim.
1245------------------------------------------------------------------------------
1246
1247(190) 22-Aug-03 S A way of testing "forced delivery" in filter and routers
1248------------------------------------------------------------------------------
1249
1250(191) 26-Aug-03 M Preserve $address_data for a verified recipient
1251
1252The idea is to preserve it in the recipients data structure so that local_scan
1253can have access to it. The value could also be used as the initial value of
1254$address_data while routing.
1255------------------------------------------------------------------------------
1256
1257(192) 05-Sep-03 M Better handling of TXT records for dnslists
1258
1259When multiple lists are accessible via a merged lookup, handling TXT records
1260is difficult. An option for doing the TXT lookup in a sub-list has been
1261suggested, with syntax such as
1262
1263 dnslists = list.example.org=127.0.0.2%dialups \
1264 ,127.0.0.3%relays \
1265 ,127.0.0.5%spews
1266------------------------------------------------------------------------------
1267
1268(194) 10-Sep-03 M $addresslist_data to be like $host_data/$domain_data
1269
1270------------------------------------------------------------------------------
1271
1272(195) 29-Sep-03 M A variable containing the error for verify = header_syntax
1273
1274Maybe there should always be a variable with the error message for all the
1275different kinds of verify failure.
1276------------------------------------------------------------------------------
1277
1278(196) 30-Sep-03 S A way of detecting whether it was HELO or EHLO in the ACL
1279
1280$received_protocol isn't reset until after the command is accepted (which
1281seems right), and $smtp_data shows only the arguments. Maybe $smtp_command?
1282------------------------------------------------------------------------------
1283
1284(197) 30-Sep-03 S MACROS_DROP_PRIVS and ALT_CONFIG_DROP_PRIVS
1285
1286Now that alternative configurations can be restricted to certain directories,
1287some more flexibility can be allowed. Not by default, though.
1288------------------------------------------------------------------------------
1289
1290(198) 01-Oct-03 M Accept mail after local_scan() crash instead of defer
1291
1292This may not be as easy to implement as it sounds; one is never sure of the
1293environment after a crash. Is is actually a good idea? The crashing local_scan
1294may have wrecked the memory in arbitrary ways; for example, screwing up the
1295recipients list...
1296------------------------------------------------------------------------------
1297
1298(199) 01-Oct-03 M ${pipe which will pipe the message to a script ...
1299
1300... and otherwise behave as ${run. Probably needs to have locking out features
1301so that it can be turned off for users .forwards if the sysadmin so desires.
1302------------------------------------------------------------------------------
1303
1304(200) 07-Oct-03 L Alternative ways of storing hints
1305
1306People want to store hints in databases. Some assert that SQL databases can
1307be made to perform satisfactorily. If a general interface could be worked on,
1308people could at least try different strategies. See also 66 above, which is
1309specifically concerned with Berkeley DB. Another possible option is a switch to
1310disable smtp-wait hints - to avoid contention problems.
1311------------------------------------------------------------------------------
1312
1313(201) 07-Oct-03 M A "soft bounce" feature
1314
1315This is an option that turns all hard bounces into soft bounces. The idea is
1316that it can be used as a safety-net while testing configurations. Instead of a
1317local bounce, the message stays on the queue; instead of 5xx SMTP responses,
13184xx ones are given.
1319
1320The ability to do the opposite - turn 4xx into 5xx under certain circumstances
1321might also be useful (e.g. after a certain time). This might best be done by
1322extending the retry logic to recognize 4xx as a special error. (This is now
1323done.)
1324------------------------------------------------------------------------------
1325
1326(202) 10-Oct-03 S -bvsomething to do a callout after the verify
fb636a0f
PH
1327
1328For example: -bvc and -bvsc. The problem now (Nov 04) is that there are quite a
1329few possible callout options that can be specified in an ACL, and they would
1330have to be replicated here.
e05f33e0
PH
1331------------------------------------------------------------------------------
1332
1333(203) 14-Oct-03 S verify=something to easily check for header presence
1334
1335This is purely cosmetic; "condition" can already be used.
1336------------------------------------------------------------------------------
1337
1338(204) 27-Oct-03 S an inverted queue_only_file
1339
1340That is, queue if a file does NOT exist.
1341------------------------------------------------------------------------------
1342
1343(205) 27-Oct-03 S expand smtp_accept_queue_per_connection
1344
1345------------------------------------------------------------------------------
1346
1347(206) 27-Oct-03 S appendfile: a variable containing the maildir base name
1348
1349------------------------------------------------------------------------------
1350
1351(207) 29-Oct-03 S ability to keep trusted users in a file - expand it.
1352------------------------------------------------------------------------------
1353
1354(208) 31-Oct-03 M cache temporary verification errors and fail after a time
1355
1356This request was for a way of turning temporary verification failures into
1357permanent ones after some fixed time.
1358------------------------------------------------------------------------------
1359
1360(209) 31-Oct-03 S a way of making crashes in pipe commands temporary errors
1361
1362------------------------------------------------------------------------------
1363
1364(210) 31-Oct-03 S runtime option to change the daemon name used for tcprwappers
1365
1366A patch for compile time was supplied, but this seems better as a runtime
1367option, for use with multiple Exim daemons.
1368------------------------------------------------------------------------------
1369
1370(211) 31-Oct-03 S ability to disable debugging output from -bh & -bhc
1371------------------------------------------------------------------------------
1372
1373(212) 31-Oct-03 M specify headers lines in HELO ACL to be added to all msgs
1374------------------------------------------------------------------------------
1375
1376(214) 05-Nov-03 S Put the wild part of local part prefix/suffx in variables
1377
1378Unfortunately, this isn't quite as trivial as it seems.
1379------------------------------------------------------------------------------
1380
1381(215) 14-Nov-03 S A way of turning off message-submission fix-ups
1382
1383Globally, and perhaps also via an ACL control so that it can be done on a
fb636a0f
PH
1384per-message basis. Is this still needed? Since this item was added to this
1385list, default fixups for non-local messages have been removed, and control =
1386submission has been added.
e05f33e0
PH
1387------------------------------------------------------------------------------
1388
1389(215) 26-Nov-03 M/L Conversion of IDNA domain names for logging
1390
1391IDNA (RFCs 3490-3492) converts domains names containing non-ASCII characters
1392into ASCII strings of a special form. Exim will of course handle these.
1393However, it might be nice to convert them to a local code for logging. This
1394might be quite a big project: there's also output from -bp and eximon queue
1395display and no doubt other places as well. (Utilities that process the logs,
1396e.g. exigrep, eximstats, will be automatically handled if the logs are
1397changed.)
1398------------------------------------------------------------------------------
1399
1400(216) 27-Nov-03 S Option to bounce if required TLS doesn't happen
1401
1402This is for the smtp transport with hosts_require_tls set. Currently, it
1403defers. Possibly the best approach is to make the error one that can be seen by
1404the retry logic.
1405------------------------------------------------------------------------------
1406
1407(217) 27-Nov-03 M A function to pass back variables from Perl
1408
1409This is a function that can be called from Perl, to take a name and a value and
1410put that value into an Exim variable.
1411------------------------------------------------------------------------------
1412
1413(218) 01-Dec-03 M A local_scan-like hook at system filter time
1414
1415That is, make a C API available for custom filtering at this point.
1416------------------------------------------------------------------------------
1417
1418(221) 18-Dec-03 U Merge routers and ACLs - or at least make more similar
1419
1420"It will be very useful to be able to use most of the ACL conditions
1421(authenticated, hosts, senders, sender_domains, ... ) in routers and also the
1422possibility to have multiple conditions in routers. It will be great to also
1423be able to set variables in routers like in acl's." This is effectively a
1424radical suggestion for a complete re-design, and is therefore BIG.
1425------------------------------------------------------------------------------
1426
e05f33e0 1427(223) 22-Dec-03 S Support SOA lookup in dnsdb lookups
fb636a0f
PH
1428
1429This could be like zns, and climb up the tree till it hits a zone. Would the
1430name of the zone be required?
e05f33e0
PH
1431------------------------------------------------------------------------------
1432
1433(225) 22-Dec-03 M Add acl= to routers
1434
1435This would use an ACL to "control access" to a router, opening up a number
1436of interesting possibilities. Details of possible limitations need to be
1437investigated.
1438------------------------------------------------------------------------------
1439
1440(226) 23-Dec-03 S A way of treating DEFER as fail in dnsdb lookups
1441
1442(i.e. the dnsdb lookup failed, so accept the message)
1443------------------------------------------------------------------------------
1444
1445(227) 30-Jan-04 M A configuration .if facility
1446
1447"Second with the .ifdef and such, it would be nice to have a base .if,
1448so I could do something like
1449.if DEFINED_DATA == xyz
1450configuration here
1451.elseif DEFINED_DATA == abc
1452configuration here
1453.else
1454configuration here
1455.endif
1456also this would be nice at least in my case in the system filters, but
1457isn't required but you could pass the defined data to the system, in
1458variables."
1459------------------------------------------------------------------------------
1460
1461(229) 30-Jan-04 M New expansion mechanism: {list ...}
1462
1463"Proposed syntax: {list {separator}{item}{item}...}
1464This first expands the contents of {separator} and all of the {item}s,
1465then constructs a separator-delimited list. The twist is: if an {item}
1466generates the empty string, no separator will be generated for it.
1467The entire construct will fail is {separator} fails, or all {item}s
1468fail. If just some {item}s fail, they will be treated as if they
1469generated empty strings.
1470Examples:
1471 {list {,}{aaaaaa}{bbbbbb}{cccccc}} -> aaaaaa,bbbbbb,cccccc
1472 {list {,}{:fail:}{bbbbbb}{cccccc}} -> bbbbbb,cccccc
1473 {list {,}{aaaaaa}{:fail:}{cccccc}} -> aaaaaa,cccccc
1474 {list { }{aaaaaa}{bbbbbb}{}} -> aaaaaa bbbbbb
1475 {list { }{:fail:}{:fail:}{:fail:}} -> :fail:
1476 {list {:fail:}{aaaaa}{bbbb}{cccc}} -> :fail:
1477See particularly examples 2-4, which handle the case of a missing first
1478and last item with ease; doing this using {if ...} would be quite difficult!"
1479------------------------------------------------------------------------------
1480
1481(230) 30-Jan-04 M Find IP addresses of a domain's nameservers
1482
1483This needs some way of processing a list of things in a similar way, which
1484should perhaps be a more general facility.
1485------------------------------------------------------------------------------
1486
1487(231) 30-Jan-04 ? -C has a number of problems when used for real
1488
1489-C was intended for testing; people are using it for "alternate"
1490configurations, and it doesn't work too well. Can a better way of doing this be
1491invented?
1492------------------------------------------------------------------------------
1493
1494(232) 02-Feb-04 ? Make parts of the code loadable
1495
1496The idea being that drivers, etc. could be compiled separately. There are, of
1497course, security issues. This is not something I want to go into at present.
1498------------------------------------------------------------------------------
1499
1500(235) 02-Feb-04 T Make smtp_accept_count available as a variable
1501
1502This is for use in ACLs. Of course, it is a snapshot of the count at the
1503start of the receiving process.
1504------------------------------------------------------------------------------
1505
1506(236) 02-Feb-04 S String in local_scan that's added to the binary version string
1507------------------------------------------------------------------------------
1508
1509(237) 02-Feb-04 M Add_header in ACLs because "message" is overloaded
1510
1511This would be useful for verbs where "message" is an error message.
1512------------------------------------------------------------------------------
1513
1514(238) 05-Feb-04 S ${address to handle multiple addresses
1515
1516At present, ${address expects to see just one address. An extension would let
1517it handle header lines with multiple addresses, just retaining the actual
1518addresses. Or perhaps a new operator is needed?
1519------------------------------------------------------------------------------
1520
1521(239) 23-Feb-04 ? Expansion items for encryption/decryption
1522
1523Perhaps for some kind of cookie handling? This would need an external crypto
1524library, because there's no crypto code in Exim itself.
1525------------------------------------------------------------------------------
1526
1527(240) 23-Feb-04 ? Some way to know if a ip is a mx for a given domain
1528
1529Some kind of iterative operation for dnsdb might be a general way of providing
1530this.
1531------------------------------------------------------------------------------
1532
1533(242) 01-Mar-04 ? Run a filter from an expansion condition
1534
1535This would add a lot of power to ACLs, but its implementation might be tricky
1536because of the possibility of recursion.
1537------------------------------------------------------------------------------
1538
1539(243) 01-Mar-04 ? Run an ACL from an expansion condition
1540
1541The problem here is knowing what data is available at an arbitrary time.
1542------------------------------------------------------------------------------
1543
1544(244) 01-Mar-04 ? Add an on-success event to transports
1545
1546This could just be an expansion string, whose value is either ignored or
1547logged, but it could be used to run SQL updates or run programs etc.
1548However, what is "success" when a transport has multiple recipients?
1549------------------------------------------------------------------------------
1550
1551(245) 01-Mar-04 M Add all the string expansion conditions to filters
1552
1553Some thought would be needed on how to design the syntax for this.
1554------------------------------------------------------------------------------
1555
1556(247) 09-Mar-04 S IP addresses that are never looked up
1557
1558It would be nice if we could prevent this for certain IP addresses for
1559which we _know_ we'll never get a valid PTR record, like 2002::/16.
1560So a new option might reasonably default to:
1561
1562 hosts_never_lookup = <; 2002::/16
1563------------------------------------------------------------------------------
1564
1565(253) 05-Apr-04 M Use ESMTP and TLS for recipient callout verification
1566
1567The best way to do this would involve quite a bit of refactoring so as to
1568abstract some of the code from the smtp transport into subroutines that could
1569also be used from the callout code. The tls parameters should probably be
1570taken from the transport. That might also require some substantial code
1571refactoring. See also 294.
1572------------------------------------------------------------------------------
1573
1574(260) 30-Apr-04 S Respect +tls_cipher +tls_peerdn in rejectlog entries
1575
1576------------------------------------------------------------------------------
1577
1578(261) 05-May-04 S Add a "required_version" option
1579
1580So that configurations can insist on a specific Exim version.
1581------------------------------------------------------------------------------
1582
1583(262) 10-May-04 S Add "scratch" ACL variables
1584
1585The idea is for variables that are flushed at the start of each ACL. I'm not
1586really convinced that these are worth implementing.
1587------------------------------------------------------------------------------
1588
1589(263) 10-May-04 S Add variable $router_name $transport_name
1590
1591These could be used in debug_print settings, which are output during -bt, and
1592thus don't need the privilege to run with -d.
1593------------------------------------------------------------------------------
1594
1595(265) 25-May-04 M An init.d script for exim is needed
1596
1597The old sendmail script used to "just work" because it just did -bd -q 20m or
1598whatever. Newer versions start more than one sendmail daemon, so do not work.
1599------------------------------------------------------------------------------
1600
1601(267) 25-May-04 S tarpitting delay option
1602
1603A modifier that sets a delay between lines for multiline responses.
1604------------------------------------------------------------------------------
1605
1606(268) 25-May-04 S? Add a PID to every log line
1607
1608Given that pids are reused non-cyclically these days, is this actually useful?
1609------------------------------------------------------------------------------
1610
e05f33e0
PH
1611(270) 01-Jun-04 M Add headers at top and middle
1612
1613Various initiatives like SPF and DomainKeys require header lines to be added
1614above or in the middle of existing headers. Exim always adds at the bottom.
1615When these requirements are more standard and clearer, some way of controlling
1616where header lines are added will probably become necessary. Some new syntax
1617will be required.
1618
1619This can now be done fairly generally from local_scan(), and at the start and
1620after the Received: block from an ACL. Is anything more needed?
1621------------------------------------------------------------------------------
1622
1623(271) 02-Jun-04 L Callouts at routing time
1624
1625From a user's message:
1626
1627> I would like to be able to:
1628>[...]
1629> 2) Forcing callouts as address verification at router level
1630> [ check_callout just like check_local_user ]
1631>
1632> I would like to redirect messages in some domain to "domain with callout
1633> verification" and to "domain without callout verification"
1634>
1635> e.g.
1636> userA@domain.in -> userX@doamin.out-verify (use callout to verify)
1637> userB@domain.in -> userY@doamin.out-noverify (do not use callout verify)
1638>
1639> [both out-* domains delivered via "callout ready" transports]
1640
1641Other versions of the wish:
1642* limiting callouts in acls to specific transport
1643 verify = recipient/callout=5s,transport:intranet_smtp
1644* adding "select transport" to ACL conditions
1645 accept domains = +local_domains
1646 transport = cyrus_ltcp
1647 verify = recipient/callout=5s
1648------------------------------------------------------------------------------
1649
1650(272) 07-Jun-04 S Expand hosts_randomize
1651
1652It occurs in manualroute and in smtp.
1653------------------------------------------------------------------------------
1654
1655(278) 21-Jun-04 M quota_warn_message_file option
1656
1657Similar to the bounce and delivery warn message files.
1658------------------------------------------------------------------------------
1659
1660(280) 23-Jun-04 M A way of adding a header line after callout defer_ok
1661
1662This would record that, e.g., a sender domain verified, but the callout
fb636a0f
PH
1663could not be done. There are ways of fudging this, using ACL variables and
1664"warn" statements.
e05f33e0
PH
1665------------------------------------------------------------------------------
1666
1667(285) 16-Jul-04 M Separate and independent log_selector for rejectlog
1668
1669For example: mainlog_selector and rejectlog_selector, with log_selector setting
1670both of them.
1671------------------------------------------------------------------------------
1672
1673(286) 21-Jul-04 M Distinguishing a larger number of errors
1674
1675For instance, detecting "connection reset by peer" (ENETRESET or ECONNRESET)
1676might be useful.
1677------------------------------------------------------------------------------
1678
1679(288) 10-Aug-04 M Option for verify to require MX
1680
1681e.g. verify=sender/require_mx
1682I'm not too keen because this is rather special purpose, and of course could
1683only apply if the verification happened to hit a dnslookup router.
1684------------------------------------------------------------------------------
1685
1686(289) 10-Aug-04 L Option to treat defers in database lookups as "not found"
1687
1688This is so that alternatives can be coded for when databases are down. A
1689suggested patch has been sent, but it just catches all instances of "defer"
1690from a lookup in an expansion string. These can occur for a number of different
1691reasons, not just connection failures. I think that we need a specific
1692"connection failed" indicator. Also, what about lookups in lists?
1693------------------------------------------------------------------------------
1694
1695(291) 13-Aug-04 M An ACL or "local_scan()" to be run on size excession
1696
1697The idea is to give something a chance to look at the data so far received when
1698more than message_size_limit (or some other limit) has arrived. I am not sure
1699how useful this would actually be in practice.
1700------------------------------------------------------------------------------
1701
1702(292) 13-Aug-04 M Overall timeout for message reception
1703
1704A client could in priciple keep an SMTP connection open for a very long time by
1705trickling in data very slowly. Also, after message_size_limit is exceeded, Exim
1706continues to swallow the data (though it does not write it to disk) until the
1707end is reached. Again, the connection could be held open for a very long time.
1708Some kind of overall time limit for an SMTP connection, possibly reset at the
1709start of each message, might be helpful in these situations.
1710------------------------------------------------------------------------------
1711
1712(294) 23-Aug-04 L Callouts and AUTH and LMTP
1713
1714People want to do callouts using LMTP as well as SMTP, and that would also
1715include sockets as well as TCP/IP connections. Also, people want to make use of
1716AUTH during the callout checking, on all types of connection. I suppose that
1717means making TLS available as well. This probably means a rewrite of the code
1718that actually does the callout. Should we use the relevant transport in a new
1719"callout" mode instead of keeping things separate? See also 253.
461f4862
PH
1720
1721And here's another submitted idea: "My actual suggestion is that if this model
1722is followed, the parent process doesn't have to stop the callout process if it
1723is taking too long to respond: it can return 450 to the incoming connection
1724within the 5 minute SMTP command timeout and leave the callout process to
1725continue, in the hope that it will eventually get a result and store it in the
1726callout cache in time for the sender's next attempt."
e05f33e0
PH
1727------------------------------------------------------------------------------
1728
1729(296) 09-Sep-04 S Make deliver_time work for == lines as well as =>
1730
1731What about ** lines?
1732------------------------------------------------------------------------------
35f53bf6
PH
1733
1734(298) 25-Oct-04 S Debugging the daemon process only
1735
1736When there are daemon problems (e.g. it dies) it would be helpful to be able to
1737turn on debugging that did not get passed on to any subprocesses.
1738------------------------------------------------------------------------------
1739
1740(299) 25-Oct-04 S Options to make Sieve "keep" pass to next router
1741
1742Currently, "keep" saves in the mailbox. Probably need two options, for implicit
1743and explicit keep commands.
1744------------------------------------------------------------------------------
1745
1746(300) 25-Oct-04 S Option to lock out Sieve or Exim filter
1747
1748Currently, if allow_filter is set, either kind of filter is permitted.
1749------------------------------------------------------------------------------
0cf417c5
PH
1750
1751(301) 27-Oct-04 M Use an "ACL" to filter logging
1752
1753This idea was for ACL syntax to be able to "accept" or "deny" individual log
1754lines. This would make it possible to have, for example, per-host logging for
1755certain things. See also 15 above.
1756------------------------------------------------------------------------------
32aaebb6
PH
1757
1758(302) 28-Oct-04 M Expand pass_router and redirect_router
1759
1760Doing this would mean postponing the validity checks till the router was
1761actually used instead of doing them at start up. It does not seem to be a
1762facility that will be widely used.
1763------------------------------------------------------------------------------
1764
1765(303) 28-Oct-04 M Support SQL relay
1766
1767This would make it easier for packagers to support "generic SQL" without having
1768to choose which one. It can be slotted in using a MySQL interface without
1769modifying Exim, but native support would be nice.
1770------------------------------------------------------------------------------
1771
1772(304) 02-Nov-04 M A way of seeing the whole message in Perl or ${run
1773
1774At present, the headers are available in $message_headers, but only part of
1775the body is visible. The only way to pass the whole body would be as a file
1776descriptor because it can be very large. See also (42).
1777------------------------------------------------------------------------------
1778
1779(305) 02-Nov-04 M A Perl transport
1780
1781The suggestion here is that an embedded Perl function takes responsibility for
1782doing the delivery. I am not at all keen on this. One way of doing it would be
1783to implement (244), which provides an "on success" string expansion. Then
1784anyone who wants this could run that on a transport that does nothing.
1785------------------------------------------------------------------------------
b5c45968
PH
1786
1787(306) 09-Nov-04 M Make the search type partial-lsearch*@ be useful
1788
1789At present, it treats the whole key as a domain for the partial search, then
1790does the *@ thing. A more sensible plan would be something like:
1791
1792 user@company.com
1793 *@company.com
1794 user@*.company.com
1795 *@*.company.com
1796 *
1797
1798That is, try the local part and * at each of the partial domain values.
1799------------------------------------------------------------------------------
5b1fde4d
PH
1800
1801(307) 24-Nov-04 S Check the syntax of Message-ID: header lines
1802
1803This could be added to "verify=header_syntax" or, if the incompatibility is
1804felt to be too great, an additional condition, or a sub-option, could be added.
1805------------------------------------------------------------------------------
908acc4e
PH
1806
1807(308) 24-Nov-04 S Add $body_longlinecount and $header_longlinecount
1808
1809These variables would hold the number of physical lines in the body and header
1810that were longer than 998 bytes. This would be fiddly to implement because of
1811the way Exim currently reads the input. It isn't just a trivial patch.
1812------------------------------------------------------------------------------
a78fb8ef
PH
1813
1814(309) 01-Dec-04 S/M Queue runners should get locks before forking
1815
1816If a queue-runner opened the -D file and took out the lock before forking, it
1817would waste fewer resources if the message was already being delivered. But how
1818often would this actually matter in practice?
1819------------------------------------------------------------------------------
fbbf1e99
PH
1820
1821(310) 06-Dec-04 S After "personal" save what matched
1822
1823The idea is to save the email address that actually was found in the message
1824in a variable so it can be used (e.g. as the From: address in an autoreply).
1825------------------------------------------------------------------------------
59e88703
PH
1826
1827(311) 07-Dec-04 ? More flexible SMTP response codes
1828
1829The requestor wanted to be able to specify, for example, 551 in an ACL deny
1830instead of 550, and also vary the defer code. The first digit, however, should
1831remain fixed. In addition to main codes, enhanced status codes (RFC 2034) were
1832requested. (As far as I can tell, they have never been highly popular.)
1833------------------------------------------------------------------------------
f7b63901
PH
1834
1835(312) 10-Dec-04 ? Shadow remote transports
1836
1837Unless a lot of work is done, this would be restricted to another remote
1838transport. A similar effect could therefore be achieved with "shadow_hosts"
1839which are like fallback_hosts but which operate on success.
1840------------------------------------------------------------------------------
1841--- HWM 312 ------------------------------------------------------------------
e05f33e0 1842---------------------------- End of WishList ---------------------------------