Don't check that the operands of numeric comparison operators are integers when yield...
[exim.git] / doc / doc-txt / ChangeLog
CommitLineData
d6066548 1$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.449 2006/12/24 12:12:05 magnus Exp $
495ae4b0
PH
2
3Change log file for Exim from version 4.21
4-------------------------------------------
5
93cfa765
TK
6Exim version 4.65
7-----------------
8
9TK/01 Disable default definition of HAVE_LINUX_SENDFILE. Clashes with
10 Linux large file support (_FILE_OFFSET_BITS=64) on older glibc
11 versions. (#438)
12
d6066548
MH
13MH/01 Don't check that the operands of numeric comparison operators are
14 integers when their expansion is in "skipping" mode (fixes bug
15 introduced by 4.64-PH/07).
16
93cfa765 17
944e9e9c
TF
18Exim version 4.64
19-----------------
aa41d2de 20
21d74bd9
TK
21TK/01 Bugzilla #401. Fix DK spooling code so that it can overwrite a
22 leftover -K file (the existence of which was triggered by #402).
23 While we were at it, introduced process PID as part of the -K
24 filename. This should rule out race conditions when creating
25 these files.
26
27TK/02 Bugzilla #402. Apply patch from Simon Arlott, speeding up DK signing
28 processing considerably. Previous code took too long for large mails,
29 triggering a timeout which in turn triggers #401.
30
31TK/03 Introduced HAVE_LINUX_SENDFILE to os.h-Linux. Currently only used
32 in the DK code in transports.c. sendfile() is not really portable,
33 hence the _LINUX specificness.
944e9e9c
TF
34
35TF/01 In the add_headers option to the mail command in an Exim filter,
36 there was a bug that Exim would claim a syntax error in any
37 header after the first one which had an odd number of characters
38 in the field name.
39
2b1c6e3a
PH
40PH/01 If a server that rejects MAIL FROM:<> was the target of a sender
41 callout verification, Exim cached a "reject" for the entire domain. This
42 is correct for most verifications, but it is not correct for a recipient
43 verification with use_sender or use_postmaster set, because in that case
44 the callout does not use MAIL FROM:<>. Exim now distinguishes the special
45 case of MAIL FROM:<> rejection from other early rejections (e.g.
46 rejection of HELO). When verifying a recipient using a non-null MAIL
47 address, the cache is ignored if it shows MAIL FROM:<> rejection.
48 Whatever the result of the callout, the value of the domain cache is
49 left unchanged (for any other kind of callout, getting as far as trying
50 RCPT means that the domain itself is ok).
51
1f872c80
PH
52PH/02 Tidied a number of unused variable and signed/unsigned warnings that
53 gcc 4.1.1 threw up.
54
55PH/03 On Solaris, an unexpectedly close socket (dropped connection) can
56 manifest itself as EPIPE rather than ECONNECT. When tidying away a
57 session, the daemon ignores ECONNECT errors and logs others; it now
58 ignores EPIPE as well.
59
d203e649
PH
60PH/04 Applied Nico Erfurth's refactoring patch to tidy up mime.c
61 (quoted-printable decoding).
62
cc2ed8f7 63PH/05 Applied Nico Erfurth's refactoring patch to tidy up spool_mbox.c, and
21a04aa3 64 later the small subsequent patch to fix an introduced bug.
f951fd57 65
ddfcd446
PH
66PH/06 Installed the latest Cygwin Makefile from the Cygwin maintainer.
67
d45b1de8
PH
68PH/07 There was no check for overflow in expansions such as ${if >{1}{4096M}}.
69
70PH/08 An error is now given if message_size_limit is specified negative.
71
38a0a95f 72PH/09 Applied and tidied up Jakob Hirsch's patch for allowing ACL variables
641cb756 73 to be given (somewhat) arbitrary names.
38a0a95f 74
a2405d83
JJ
75JJ/01 exipick 20060919.0, allow for arbitrary acl_ variables introduced
76 in 4.64-PH/09.
77
78JJ/02 exipick 20060919.0, --show-vars args can now be regular expressions,
79 miscellaneous code fixes
80
6ea85e9a
PH
81PH/10 Added the log_reject_target ACL modifier to specify where to log
82 rejections.
83
26da7e20
PH
84PH/11 Callouts were setting the name used for EHLO/HELO from $smtp_active_
85 hostname. This is wrong, because it relates to the incoming message (and
86 probably the interface on which it is arriving) and not to the outgoing
87 callout (which could be using a different interface). This has been
88 changed to use the value of the helo_data option from the smtp transport
89 instead - this is what is used when a message is actually being sent. If
90 there is no remote transport (possible with a router that sets up host
91 addresses), $smtp_active_hostname is used.
6ea85e9a 92
14aa5a05 93PH/12 Installed Andrey Panin's patch to add a dovecot authenticator. Various
7befa435 94 tweaks were necessary in order to get it to work (see also 21 below):
14aa5a05
PH
95 (a) The code assumed that strncpy() returns a negative number on buffer
96 overflow, which isn't the case. Replaced with Exim's string_format()
97 function.
98 (b) There were several signed/unsigned issues. I just did the minimum
99 hacking in of casts. There is scope for a larger refactoring.
100 (c) The code used strcasecmp() which is not a standard C function.
101 Replaced with Exim's strcmpic() function.
102 (d) The code set only $1; it now sets $auth1 as well.
103 (e) A simple test gave the error "authentication client didn't specify
104 service in request". It would seem that Dovecot has changed its
105 interface. Fortunately there's a specification; I followed it and
106 changed what the client sends and it appears to be working now.
107
ff75a1f7
PH
108PH/13 Added $message_headers_raw to provide the headers without RFC 2047
109 decoding.
110
e6f6568e
PH
111PH/14 Corrected misleading output from -bv when -v was also used. Suppose the
112 address A is aliased to B and C, where B exists and C does not. Without
113 -v the output is "A verified" because verification stops after a
114 successful redirection if more than one address is generated. However,
115 with -v the child addresses are also verified. Exim was outputting "A
116 failed to verify" and then showing the successful verification for C,
117 with its parentage. It now outputs "B failed to verify", showing B's
118 parentage before showing the successful verification of C.
119
d6f6e0dc
PH
120PH/15 Applied Michael Deutschmann's patch to allow DNS black list processing to
121 look up a TXT record in a specific list after matching in a combined
122 list.
123
322050c2
PH
124PH/16 It seems that the options setting for the resolver (RES_DEFNAMES and
125 RES_DNSRCH) can affect the behaviour of gethostbyname() and friends when
126 they consult the DNS. I had assumed they would set it the way they
127 wanted; and indeed my experiments on Linux seem to show that in some
128 cases they do (I could influence IPv6 lookups but not IPv4 lookups).
129 To be on the safe side, however, I have now made the interface to
130 host_find_byname() similar to host_find_bydns(), with an argument
131 containing the DNS resolver options. The host_find_byname() function now
132 sets these options at its start, just as host_find_bydns() does. The smtp
133 transport options dns_qualify_single and dns_search_parents are passed to
134 host_find_byname() when gethostbyname=TRUE in this transport. Other uses
135 of host_find_byname() use the default settings of RES_DEFNAMES
136 (qualify_single) but not RES_DNSRCH (search_parents).
137
08955dd3
PH
138PH/17 Applied (a modified version of) Nico Erfurth's patch to make
139 spool_read_header() do less string testing, by means of a preliminary
140 switch on the second character of optional "-foo" lines. (This is
141 overdue, caused by the large number of possibilities that now exist.
142 Originally there were few.) While I was there, I also converted the
143 str(n)cmp tests so they don't re-test the leading "-" and the first
144 character, in the hope this might squeeze out yet more improvement.
145
1eccaa59
PH
146PH/18 Two problems with "group" syntax in header lines when verifying: (1) The
147 flag allowing group syntax was set by the header_syntax check but not
148 turned off, possible causing trouble later; (2) The flag was not being
149 set at all for the header_verify test, causing "group"-style headers to
150 be rejected. I have now set it in this case, and also caused header_
151 verify to ignore an empty address taken from a group. While doing this, I
152 came across some other cases where the code for allowing group syntax
153 while scanning a header line wasn't quite right (mostly, not resetting
154 the flag correctly in the right place). These bugs could have caused
155 trouble for malformed header lines. I hope it is now all correct.
156
602e59e5
PH
157PH/19 The functions {pwcheck,saslauthd}_verify_password() are always called
158 with the "reply" argument non-NULL. The code, however (which originally
159 came from elsewhere) had *some* tests for NULL when it wrote to *reply,
160 but it didn't always do it. This confused somebody who was copying the
161 code for some other use. I have removed all the tests.
162
411ef850
PH
163PH/20 It was discovered that the GnuTLS code had support for RSA_EXPORT, a
164 feature that was used to support insecure browsers during the U.S. crypto
165 embargo. It requires special client support, and Exim is probably the
166 only MTA that supported it -- and would never use it because real RSA is
167 always available. This code has been removed, because it had the bad
168 effect of slowing Exim down by computing (never used) parameters for the
169 RSA_EXPORT functionality.
170
7befa435
PH
171PH/21 On the advice of Timo Sirainen, added a check to the dovecot
172 authenticator to fail if there's a tab character in the incoming data
173 (there should never be unless someone is messing about, as it's supposed
174 to be base64-encoded). Also added, on Timo's advice, the "secured" option
175 if the connection is using TLS or if the remote IP is the same as the
176 local IP, and the "valid-client-cert option" if a client certificate has
177 been verified.
178
48da4259 179PH/22 As suggested by Dennis Davis, added a server_condition option to *all*
16ff981e
PH
180 authenticators. This can be used for authorization after authentication
181 succeeds. (In the case of plaintext, it servers for both authentication
182 and authorization.)
183
48da4259
PH
184PH/23 Testing for tls_required and lost_connection in a retry rule didn't work
185 if any retry times were supplied.
186
d1d5595c
PH
187PH/24 Exim crashed if verify=helo was activated during an incoming -bs
188 connection, where there is no client IP address to check. In this
189 situation, the verify now always succeeds.
190
0ef732d9
PH
191PH/25 Applied John Jetmore's -Mset patch.
192
328895cc
PH
193PH/26 Added -bem to be like -Mset, but loading a message from a file.
194
fd700877
PH
195PH/27 In a string expansion for a processed (not raw) header when multiple
196 headers of the same name were present, leading whitespace was being
197 removed from all of them, but trailing whitespace was being removed only
198 from the last one. Now trailing whitespace is removed from each header
f6c332bd
PH
199 before concatenation. Completely empty headers in a concatenation (as
200 before) are ignored.
fd700877 201
8dce1a6f
PH
202PH/28 Fixed bug in backwards-compatibility feature of PH/09 (thanks to John
203 Jetmore). It would have mis-read ACL variables from pre-4.61 spool files.
204
17af4a17
PH
205PH/29 [Removed. This was a change that I later backed out, and forgot to
206 correct the ChangeLog entry (that I had efficiently created) before
207 committing the later change.]
f6c332bd
PH
208
209PH/30 Exim was sometimes attempting to deliver messages that had suffered
210 address errors (4xx response to RCPT) over the same connection as other
211 messages routed to the same hosts. Such deliveries are always "forced",
212 so retry times are not inspected. This resulted in far too many retries
213 for the affected addresses. The effect occurred only when there were more
214 hosts than the hosts_max_try setting in the smtp transport when it had
215 the 4xx errors. Those hosts that it had tried were not added to the list
216 of hosts for which the message was waiting, so if all were tried, there
217 was no problem. Two fixes have been applied:
218
219 (i) If there are any address or message errors in an SMTP delivery, none
220 of the hosts (tried or untried) are now added to the list of hosts
221 for which the message is waiting, so the message should not be a
222 candidate for sending over the same connection that was used for a
223 successful delivery of some other message. This seems entirely
224 reasonable: after all the message is NOT "waiting for some host".
225 This is so "obvious" that I'm not sure why it wasn't done
226 previously. Hope I haven't missed anything, but it can't do any
227 harm, as the worst effect is to miss an optimization.
228
229 (ii) If, despite (i), such a delivery is accidentally attempted, the
230 routing retry time is respected, so at least it doesn't keep
231 hammering the server.
232
c1114884
PH
233PH/31 Installed Andrew Findlay's patch to close the writing end of the socket
234 in ${readsocket because some servers need this prod.
235
7a0743eb
PH
236PH/32 Added some extra debug output when updating a wait-xxx database.
237
0d85fa3f
PH
238PH/33 The hint "could be header name not terminated by colon", which has been
239 given for certain expansion errors for a long time, was not being given
240 for the ${if def:h_colon_omitted{... case.
241
1bf43b78
PH
242PH/34 The spec says: "With one important exception, whenever a domain list is
243 being scanned, $domain contains the subject domain." There was at least
244 one case where this was not true.
245
520de300
PH
246PH/35 The error "getsockname() failed: connection reset by peer" was being
247 written to the panic log as well as the main log, but it isn't really
248 panic-worthy as it just means the connection died rather early on. I have
249 removed the panic log writing for the ECONNRESET error when getsockname()
250 fails.
251
48c7f9e2
PH
252PH/36 After a 4xx response to a RCPT error, that address was delayed (in queue
253 runs only) independently of the message's sender address. This meant
254 that, if the 4xx error was in fact related to the sender, a different
255 message to the same recipient with a different sender could confuse
256 things. In particualar, this can happen when sending to a greylisting
257 server, but other circumstances could also provoke similar problems.
258 I have changed the default so that the retry time for these errors is now
259 based a combination of the sender and recipient addresses. This change
260 can be overridden by setting address_retry_include_sender=false in the
261 smtp transport.
262
99ea1c86
PH
263PH/37 For LMTP over TCP/IP (the smtp transport), error responses from the
264 remote server are returned as part of bounce messages. This was not
265 happening for LMTP over a pipe (the lmtp transport), but now it is the
266 same for both kinds of LMTP.
267
a2042e78
PH
268PH/38 Despite being documented as not happening, Exim was rewriting addresses
269 in header lines that were in fact CNAMEs. This is no longer the case.
270
4fbcfc2e
PH
271PH/39 If -R or -S was given with -q<time>, the effect of -R or -S was ignored,
272 and queue runs started by the daemon processed all messages. This has
273 been fixed so that -R and -S can now usefully be given with -q<time>.
274
aa41d2de
PH
275PH/40 Import PCRE release 6.7 (fixes some bugs).
276
af561417
PH
277PH/41 Add bitwise logical operations to eval (courtesy Brad Jorsch).
278
3cc66b45
PH
279PH/42 Give an error if -q is specified more than once.
280
194cc0e4
PH
281PH/43 Renamed the variables $interface_address and $interface_port as
282 $received_ip_address and $received_port, to make it clear that these
283 values apply to message reception, and not to the outgoing interface when
284 a message is delivered. (The old names remain recognized, of course.)
285
a401ddaa
PH
286PH/44 There was no timeout on the connect() call when using a Unix domain
287 socket in the ${readsocket expansion. There now is.
288
4e88a19f
PH
289PH/45 Applied a modified version of Brad Jorsch's patch to allow "message" to
290 be meaningful with "accept".
291
d7d7b289
SC
292SC/01 Eximstats V1.43
293 Bug fix for V1.42 with -h0 specified. Spotted by Chris Lear.
294
295SC/02 Eximstats V1.44
296 Use a glob alias rather than an array ref in the generated
297 parser. This improves both readability and performance.
298
299SC/03 Eximstats V1.45 (Marco Gaiarin / Steve Campbell)
300 Collect SpamAssassin and rejection statistics.
301 Don't display local sender or destination tables unless
302 there is data to show.
303 Added average volumes into the top table text output.
304
305SC/04 Eximstats V1.46
306 Collect data on the number of addresses (recipients)
307 as well as the number of messages.
308
309SC/05 Eximstats V1.47
310 Added 'Message too big' to the list of mail rejection
311 reasons (thanks to Marco Gaiarin).
312
313SC/06 Eximstats V1.48
314 Mainlog lines which have GMT offsets and are too short to
315 have a flag are now skipped.
316
317SC/07 Eximstats V1.49 (Alain Williams)
318 Added the -emptyok flag.
319
320SC/08 Eximstats V1.50
321 Fixes for obtaining the IP address from reject messages.
322
0ea2a468
JJ
323JJ/03 exipick.20061117.2, made header handling as similar to exim as possible
324 (added [br]h_ prefixes, implemented RFC2047 decoding. Fixed
325 whitesspace changes from 4.64-PH/27
326
327JJ/04 exipick.20061117.2, fixed format and added $message_headers_raw to
328 match 4.64-PH/13
329
330JJ/05 exipick.20061117.2, bug fixes (error out sooner when invalid criteria
331 are found, allow negative numbers in numeric criteria)
332
333JJ/06 exipick.20061117.2, added new $message_body_missing variable
334
335JJ/07 exipick.20061117.2, added $received_ip_address and $received_port
336 to match changes made in 4.64-PH/43
337
8a10f5a4
PH
338PH/46 Applied Jori Hamalainen's patch to add features to exiqsumm.
339
30e18802
PH
340PH/47 Put in an explicit test for a DNS lookup of an address record where the
341 "domain" is actually an IP address, and force a failure. This locks out
342 those revolvers/nameservers that support "A-for-A" lookups, in
343 contravention of the specifications.
344
55728a4f
PH
345PH/48 When a host name was looked up from an IP address, and the subsequent
346 forward lookup of the name timed out, the host name was left in
347 $sender_host_name, contrary to the specification.
d7d7b289 348
d7837193
PH
349PH/49 Although default lookup types such as lsearch* or cdb*@ have always been
350 restricted to single-key lookups, Exim was not diagnosing an error if
351 * or *@ was used with a query-style lookup.
352
87054a31
PH
353PH/50 Increased the value of DH_BITS in tls-gnu.c from 768 to 1024.
354
ea2c01d2
MH
355MH/01 local_scan ABI version incremented to 1.1. It should have been updated
356 long ago, but noone interested enough thought of it. Let's just say that
357 the "1.1" means that there are some new functions that weren't there at
358 some point in the past.
359
e4fa6968
PH
360PH/51 Error processing for expansion failure of helo_data from an smtp
361 transport during callout processing was broken.
362
56f5d9bd
PH
363PH/52 Applied John Jetmore's patch to allow tls-on-connect and STARTTLS to be
364 tested/used via the -bh/-bhc/-bs options.
365
922e1c28
PH
366PH/53 Added missing "#include <time.h>" to pcre/pcretest.c (this was a PCRE
367 bug, fixed in subsequent PCRE releases).
368
21eb6e72
PH
369PH/54 Applied Robert Bannocks' patch to avoid a problem with references that
370 arises when using the Solaris LDAP libraries (but not with OpenLDAP).
371
a0540757
PH
372PH/55 Check for a ridiculously long file name in exim_dbmbuild.
373
944e9e9c 374
478be7b0
SC
375Exim version 4.63
376-----------------
377
378SC/01 Use a glob alias rather than an array ref in eximstats generated
379 parser. This improves both readability and performance.
380
381SC/02 Collect SpamAssassin and rejection statistics in eximstats.
382 Don't display local sender or destination tables in eximstats unless
383 there is data to show.
384 Added average volumes into the eximstats top table text output.
385
386SC/03 Collect data on the number of addresses (recipients) as well
387 as the number of messages in eximstats.
388
2b965a65
TF
389TF/01 Correct an error in the documentation for the redirect router. Exim
390 does (usually) call initgroups() when daemonizing.
478be7b0 391
45b91596
PH
392TF/02 Call initgroups() when dropping privilege in exim.c, so that Exim runs
393 with consistent privilege compared to when running as a daemon.
478be7b0 394
c59f5781
TF
395TF/03 Note in the spec that $authenticated_id is not set for local
396 submissions from trusted users.
397
90fc3069
TF
398TF/04 The ratelimit per_rcpt option now works correctly in acl_not_smtp.
399 Thanks to Dean Brooks <dean@iglou.com> for the patch.
400
6083aca0
TF
401TF/05 Make it easier to get SMTP authentication and TLS/SSL support working
402 by adding some example configuration directives to the default
403 configuration file. A little bit of work is required to uncomment the
404 directives and define how usernames and passwords are checked, but
405 there is now a framework to start from.
406
765b530f
PH
407PH/01 Added #define LDAP_DEPRECATED 1 to ldap.c because some of the "old"
408 functions that Exim currently uses aren't defined in ldap.h for OpenLDAP
409 without this. I don't know how relevant this is to other LDAP libraries.
410
4e167a8c
PH
411PH/02 Add the verb name to the "unknown ACL verb" error.
412
4608d683
PH
413PH/03 Magnus Holmgren's patch for filter_prepend_home.
414
b8dc3e4a
PH
415PH/03 Fixed Bugzilla #101: macro definition between ACLs doesn't work.
416
5418e93b
PH
417PH/04 Applied Magnus Holmgren's patch to fix Bugzilla #98: transport's home
418 directory not expanded when it should be if an expanded home directory
419 was set for the address (which is overridden by the transport).
420
b4a9bda2
PH
421PH/05 Applied Alex Kiernan's patch to fix Bugzilla #99: a problem with
422 libradius.
423
45b91596
PH
424PH/06 Added acl_not_smtp_start, based on Johannes Berg's patch, and set the
425 bit to forbid control=suppress_local_fixups in the acl_not_smtp ACL,
426 because it is too late at that time, and has no effect.
427
5547e2c5
PH
428PH/07 Changed ${quote_pgsql to quote ' as '' instead of \' because of a
429 security issue with \' (bugzilla #107). I could not use the
430 PQescapeStringConn() function, because it needs a PGconn value as one of
431 its arguments.
432
dbcef0ea
PH
433PH/08 When testing addresses using -bt, indicate those final addresses that
434 are duplicates that would not cause an additional delivery. At least one
435 person was confused, thinking that -bt output corresponded to deliveries.
436 (Suppressing duplicates isn't a good idea as you lose the information
437 about possibly different redirections that led to the duplicates.)
438
25257489
PH
439PH/09 Applied patch from Erik to use select() instead of poll() in spam.c on
440 systems where poll() doesn't work, in particular OS X.
441
c816d124
PH
442PH/10 Added more information to debugging output for retry time not reached.
443
a9ccd69a
PH
444PH/11 Applied patch from Arkadiusz Miskiewicz to apply a timeout to read
445 operations in malware.c.
446
75fa1910
PH
447PH/12 Applied patch from Magnus Holmgren to include the "h" tag in Domain Keys
448 signatures.
449
a7d7aa58
PH
450PH/13 If write_rejectlog was set false when logging was sent to syslog with
451 syslog_duplication set false, log lines that would normally be written
452 both the the main log and to the reject log were not written to syslog at
453 all.
454
42119b09
PH
455PH/14 In the default configuration, change the use of "message" in ACL warn
456 statements to "add_header".
457
41609df5
PH
458PH/15 Diagnose a filter syntax error for "seen", "unseen", or "noerror" if not
459 not followed by a command (e.g. "seen endif").
460
a5bd321b
PH
461PH/16 Recognize SMTP codes at the start of "message" in ACLs and after :fail:
462 and :defer: in a redirect router. Add forbid_smtp_code to suppress the
463 latter.
464
e85a7ad5 465PH/17 Added extra conditions to the default value of delay_warning_condition
5dff5817
PH
466 so that it is now:
467
e85a7ad5
PH
468 ${if or { \
469 { !eq{$h_list-id:$h_list-post:$h_list-subscribe:}{} } \
470 { match{$h_precedence:}{(?i)bulk|list|junk} } \
471 { match{$h_auto-submitted:}{(?i)auto-generated|auto-replied} } \
5dff5817
PH
472 }{no}{yes}}
473
e85a7ad5
PH
474 The Auto-Submitted: and various List- headers are standardised, whereas I
475 don't think Precedence: ever was.
5dff5817 476
d8fe1c03
PH
477PH/18 Refactored debugging code in route_finduser() to show more information,
478 in particular, the error code if getpwnam() issues one.
479
16282d2b
PH
480PH/19 Added PQsetClientEncoding(conn, "SQL_ASCII") to the pgsql code module.
481 This is apparently needed in addition to the PH/07 change above to avoid
482 any possible encoding problems.
483
35d40a98
PH
484PH/20 Perl can change the locale. Exim was resetting it after a ${perl call,
485 but not after initializing Perl.
486
034d99ab
PH
487PH/21 Added a call to PQsetNoticeProcessor() to catch pgsql "notices" and
488 output them only if debugging. By default they are written stderr,
489 apparently, which is not desirable.
490
6ec97b1b
PH
491PH/22 Added Alain Williams' LDAP patch to support setting REFERRALS=off on
492 queries.
493
e22ca4ac
JJ
494JJ/01 exipick: added --reverse (and -R synonym), --random, --size, --sort and
495 --not options
496
497JJ/02 exipick: rewrote --help documentation to hopefully make more clear.
498
33d73e3b
PH
499PH/23 Made -oMaa and -oMt work with -bh and -bs to pretend the connection is
500 authenticated or an ident call has been made. Suppress the default
501 values for $authenticated_id and $authenticated_sender (but permit -oMai
502 and -oMas) when testing with -bh.
503
9ecb03f3
PH
504PH/24 Re-jigged the order of the tests in the default configuration so that the
505 tests for valid domains and recipients precede the DNS black list and CSA
506 tests, on the grounds that those ones are more expensive.
507
084efe8d
PH
508PH/25 Exim was not testing for a space following SMTP commands such as EHLO
509 that require one. Thus, EHLORHUBARB was interpreted as a valid command.
510 This bug exists in every version of Exim that I still have, right back to
511 0.12.
512
366fc9f0
PH
513PH/26 (n)wildlsearch lookups are documented as being done case-insensitively.
514 However, an attempt to turn on case-sensitivity in a regex key by
515 including (?-i) didn't work because the subject string was already
516 lowercased, and the effects were non-intuitive. It turns out that a
517 one-line patch can be used to allow (?-i) to work as expected.
518
c59f5781 519
c887c79e
TF
520Exim version 4.62
521-----------------
522
523TF/01 Fix the add_header change below (4.61 PH/55) which had a bug that (amongst
524 other effects) broke the use of negated acl sub-conditions.
525
1cce3af8
PH
526PH/01 ${readsocket now supports Internet domain sockets (modified John Jetmore
527 patch).
528
afb3eaaf
PH
529PH/02 When tcp-wrappers is called from Exim, it returns only "deny" or "allow".
530 "Deny" causes Exim to reject the incoming connection with a 554 error.
531 Unfortunately, if there is a major crisis, such as a disk failure,
532 tcp-wrappers gives "deny", whereas what one would like would be some
533 kind of temporary error. A kludge has been added to help with this.
534 Before calling hosts_ctl(), errno is set zero. If the result is "deny", a
535 554 error is used if errno is still zero or contains ENOENT (which occurs
536 if either of the /etc/hosts.{allow,deny} files is missing). Otherwise, a
537 451 error is used.
538
e173618b
PH
539PH/03 Add -lutil to the default FreeBSD LIBS setting.
540
dd16e114
PH
541PH/04 Change PH/19 for 4.61 was too wide. It should not be applied to host
542 errors. Otherwise a message that provokes a temporary error (when other
543 messages do not) can cause a whole host to time out.
544
f7fd3850
PH
545PH/05 Batch deliveries by appendfile and pipe transports did not work when the
546 addresses were routed directly to files or pipes from a redirect router.
547 File deliveries just didn't batch; pipe deliveries might have suffered
548 odd errors.
549
d87df92c
PH
550PH/06 A failure to get a lock for a hints database would erroneously always say
551 "Failed to get write lock", even when it was really a read lock.
552
7e9f683d
PH
553PH/07 The appendfile transport was creating MBX lock files with a fixed mode
554 of 0600. This has been changed to use the value of the lockfile_mode
555 option (which defaults to 0600).
556
bfad5236
PH
557PH/08 Applied small patch from the Sieve maintainer.
558
01c490df
PH
559PH/09 If maildir_quota_directory_regex was set to exclude (say) the .Trash
560 folder from quota calculations, a direct delivery into this folder messed
561 up the contents of the maildirsize file. This was because the regex was
562 used only to exclude .Trash (or whatever) when the size of the mailbox
563 was calculated. There was no check that a delivery was happening into an
564 excluded directory. This bug has been fixed by ignoring all quota
565 processing for deliveries into excluded directories.
566
d6629cdc
PH
567PH/10 Added the maildirfolder_create_regex option to appendfile.
568
1cce3af8 569
214e2000
PH
570Exim version 4.61
571-----------------
572
573PH/01 The code for finding all the local interface addresses on a FreeBSD
574 system running IPv6 was broken. This may well have applied to all BSD
575 systems, as well as to others that have similar system calls. The broken
576 code found IPv4 interfaces correctly, but gave incorrect values for the
577 IPv6 interfaces. In particular, ::1 was not found. The effect in Exim was
578 that it would not match correctly against @[] and not recognize the IPv6
579 addresses as local.
580
f9daeae0
PH
581PH/02 The ipliteral router was not recognizing addresses of the form user@
582 [ipv6:....] because it didn't know about the "ipv6:" prefix.
583
7e66e54d
PH
584PH/03 Added disable_ipv6.
585
c8ea1597
PH
586PH/04 Changed $reply_address to use the raw form of the headers instead of the
587 decoded form, because it is most often used to construct To: headers
588 lines in autoreplies, and the decoded form may well be syntactically
589 invalid. However, $reply_address has leading white space removed, and all
590 newlines turned into spaces so that the autoreply transport does not
591 grumble.
592
911f6fde
PH
593PH/05 If group was specified without a user on a router, and no group or user
594 was specified on a transport, the group from the router was ignored.
595
47ca6d6c
PH
596PH/06 Increased the number of ACL variables to 20 of each type, and arranged
597 for visible compile-time settings that can be used to change these
598 numbers, for those that want even more. Backwards compatibility with old
599 spool files has been maintained. However, going back to a previous Exim
600 release will lost any variables that are in spool files.
601
ed0e9820
PH
602PH/07 Two small changes when running in the test harness: increase delay when
603 passing a TCP/IP connection to a new process, in case the original
604 process has to generate a bounce, and remove special handling of
605 127.0.0.2 (sic), which is no longer necessary.
606
eff37e47
PH
607PH/08 Changed debug output of dbfn_open() flags from numbers to names, so as to
608 be the same on different OS.
609
1921d2ea
PH
610PH/09 Moved a debug statement in filter processing to avoid a race problem when
611 testing.
612
b3f69ca8
JJ
613JJ/01 exipick: fixed bug where -b (brief) output option showed "Vars:"
614 whether --show-vars was specified or not
615
616JJ/02 exipick: Added support for new ACL variable spool format introduced
617 in 4.61-PH/06
618
424a1c63
PH
619PH/10 Fixed another bug related to PH/04 above: if an incoming message had a
620 syntactically invalid From: or Reply-to: line, and a filter used this to
621 generate an autoreply, and therefore failed to obtain an address for the
622 autoreply, Exim could try to deliver to a non-existent relative file
623 name, causing unrelated and misleading errors. What now happens is that
624 it logs this as a hard delivery error, but does not attempt to create a
625 bounce message.
626
7a100415
PH
627PH/11 The exinext utility has a -C option for testing purposes, but although
628 the given file was scanned by exinext itself; it wasn't being passed on
629 when Exim was called.
630
19b9dc85
PH
631PH/12 In the smtp transport, treat an explicit ECONNRESET error the same as
632 an end-of-file indication when reading a command response.
633
309bd837
PH
634PH/13 Domain literals for IPv6 were not recognized unless IPv6 support was
635 compiled. In many other places in Exim, IPv6 addresses are always
636 recognized, so I have changed this. It also means that IPv4 domain
637 literals of the form [IPV4:n.n.n.n] are now always recognized.
638
59e82a2a
PH
639PH/14 When a uid/gid is specified for the queryprogram router, it cannot be
640 used if the router is not running as root, for example, when verifying at
641 ACL time, or when using -bh. The debugging output from this situation was
642 non-existent - all you got was a failure to exec. I have made two
643 changes:
644
645 (a) Failures to set uid/gid, the current directory, or a process leader
646 in a subprocess such as that created by queryprogram now generate
647 suitable debugging ouput when -d is set.
648
649 (b) The queryprogram router detects when it is not running as root,
650 outputs suitable debugging information if -d is set, and then runs
651 the subprocess without attempting to change uid/gid.
652
9edc04ce
PH
653PH/15 Minor change to Makefile for building test_host (undocumented testing
654 feature).
655
1349e1e5
PH
656PH/16 As discussed on the list in Nov/Dec: Exim no longer looks at the
657 additional section of a DNS packet that returns MX or SRV records.
658 Instead, it always explicitly searches for A/AAAA records. This avoids
659 major problems that occur when a DNS server includes only records of one
660 type (A or AAAA) in an MX/SRV packet. A byproduct of this change has
661 fixed another bug: if SRV records were looked up and the corresponding
662 address records were *not* found in the additional section, the port
663 values from the SRV records were lost.
664
ea49d0e1
PH
665PH/17 If a delivery to a pipe, file, or autoreply was deferred, Exim was not
666 using the correct key (the original address) when searching the retry
667 rules in order to find which one to use for generating the retry hint.
668
064a94c9
PH
669PH/18 If quota_warn_message contains a From: header, Exim now refrains from
670 adding the default one. Similarly, if it contains a Reply-To: header, the
671 errors_reply_to option, if set, is not used.
672
727071f8
PH
673PH/19 When calculating a retry time, Exim used to measure the "time since
674 failure" by looking at the "first failed" field in the retry record. Now
675 it does not use this if it is later than than the arrival time of the
676 message. Instead it uses the arrival time. This makes for better
677 behaviour in cases where some deliveries succeed, thus re-setting the
678 "first failed" field. An example is a quota failure for a huge message
679 when small messages continue to be delivered. Without this change, the
680 "time since failure" will always be short, possible causing more frequent
681 delivery attempts for the huge message than are intended.
dd16e114 682 [Note: This change was subsequently modified - see PH/04 for 4.62.]
727071f8 683
f78eb7c6
PH
684PH/20 Added $auth1, $auth2, $auth3 to contain authentication data (as well as
685 $1, $2, $3) because the numerical variables can be reset during some
686 expansion items (e.g. "match"), thereby losing the authentication data.
687
21c28500
PH
688PH/21 Make -bV show the size of off_t variables so that the test suite can
689 decide whether to run tests for quotas > 2G.
690
691PH/22 Test the values given for quota, quota_filecount, quota_warn_threshold,
692 mailbox_size, and mailbox_filecount in the appendfile transport. If a
693 filecount value is greater than 2G or if a quota value is greater than 2G
694 on a system where the size of off_t is not greater than 4, a panic error
695 is given.
696
1688f43b
PH
697PH/23 When a malformed item such as 1.2.3/24 appears in a host list, it can
698 never match. The debug and -bh output now contains an explicit error
699 message indicating a malformed IPv4 address or mask.
700
701PH/24 An host item such as 1.2.3.4/abc was being treated as the IP address
702 1.2.3.4 without a mask. Now it is not recognized as an IP address, and
703 PH/23 above applies.
704
9675b384
PH
705PH/25 Do not write to syslog when running in the test harness. The only
706 occasion when this arises is a failure to open the main or panic logs
707 (for which there is an explicit test).
708
6a3f1455
PH
709PH/26 Added the /no_tell option to "control=freeze".
710
dac79d3e
PH
711PH/27 If a host name lookup failed very early in a connection, for example, if
712 the IP address matched host_lookup and the reverse lookup yielded a name
713 that did not have a forward lookup, an error message of the form "no IP
714 address found for host xxx.xxx.xxx (during SMTP connection from NULL)"
715 could be logged. Now it outputs the IP address instead of "NULL".
1349e1e5 716
5977a0b3
PH
717PH/28 An enabling patch from MH: add new function child_open_exim2() which
718 allows the sender and the authenticated sender to be set when
719 submitting a message from within Exim. Since child_open_exim() is
720 documented for local_scan(), the new function should be too.
721
c91535f3
PH
722PH/29 In GnuTLS, a forced expansion failure for tls_privatekey was not being
723 ignored. In both GnuTLS and OpenSSL, an expansion of tls_privatekey that
724 results in an empty string is now treated as unset.
725
0d46a8c8
PH
726PH/30 Fix eximon buffer overflow bug (Bugzilla #73).
727
278c6e6c
PH
728PH/31 Added sender_verify_fail logging option.
729
2cbb4081
PH
730PH/32 In November 2003, the code in Exim that added an empty Bcc: header when
731 needed by RFC 822 but not by RFC 2822 was commented out. I have now
732 tidied the source and removed it altogether.
733
3eef829e
PH
734PH/33 When a queue run was abandoned because the load average was too high, a
735 log line was always written; now it is written only if the queue_run log
736 selector is set. In addition, the log line for abandonment now contains
737 information about the queue run such as the pid. This is always present
738 in "start" and "stop" lines but was omitted from the "abandon" line.
739
1ab95fa6
PH
740PH/34 Omit spaces between a header name and the colon in the error message that
741 is given when verify = headers_syntax fails (if there are lots of them,
742 the message gets confusing).
743
230205fc
PH
744PH/35 Change the default for dns_check_names_pattern to allow slashes within
745 names, as there are now some PTR records that contain slashes. This check
746 is only to protect against broken name servers that fall over on strange
747 characters, so the fact that it applies to all lookups doesn't matter.
748
75e0e026
PH
749PH/36 Now that the new test suite is complete, we can remove some of the
750 special code in Exim that was needed for the old test suite. For example,
751 sorting DNS records because real resolvers return them in an arbitrary
752 order. The new test suite's fake resolver always returns records in the
753 same order.
754
755PH/37 When running in the test harness, use -odi for submitted messages (e.g.
756 bounces) except when queue_only is set, to avoid logging races between
757 the different processes.
758
145396a6
PH
759PH/38 Panic-die if .include specifies a non-absolute path.
760
3cd34f13
PH
761PH/39 A tweak to the "H" retry rule from its user.
762
11121d3d
JJ
763JJ/03 exipick: Removed parentheses from 'next' and 'last' calls that specified
764 a label. They prevented compilation on older perls.
765
766JJ/04 exipick: Refactored code to prevent implicit split to @_ which caused
767 a warning to be raised on newish perls.
768
769JJ/05 exipick: Fixed bug where -bpc always showed a count of all messages
770 on queue. Changes to match documented behaviour of showing count of
771 messages matching specified criteria.
772
8def5aaf
PH
773PH/40 Changed the default ident timeout from 30s to 5s.
774
929ba01c
PH
775PH/41 Added support for the use of login_cap features, on those BSD systems
776 that have them, for controlling the resources used by pipe deliveries.
777
2632889e
PH
778PH/42 The content-scanning code uses fopen() to create files in which to put
779 message data. Previously it was not paying any attention to the mode of
780 the files. Exim runs with umask(0) because the rest of the code creates
781 files with open(), and sets the required mode explicitly. Thus, these
782 files were ending up world-writeable. This was not a big issue, because,
783 being within the spool directory, they were not world-accessible. I have
784 created a function called modefopen, which takes an additional mode
785 argument. It sets umask(777), creates the file, chmods it to the required
786 mode, then resets the umask. All the relevant calls to fopen() in the
787 content scanning code have been changed to use this function.
788
944a9c55
PH
789PH/43 If retry_interval_max is set greater than 24 hours, it is quietly reset
790 to 24 hours. This avoids potential overflow problems when processing G
791 and H retry rules. I suspect nobody ever tinkers with this value.
792
4a23603b
PH
793PH/44 Added STRIP_COMMAND=/usr/bin/strip to the FreeBSD Makefile.
794
4730f942
PH
795PH/45 When the plaintext authenticator is running as a client, the server's
796 challenges are checked to ensure they are valid base64 strings. By
797 default, the authentication attempt is cancelled if an invalid string is
798 received. Setting client_ignore_invalid_base64 true ignores these errors.
799 The decoded challenge strings are now placed in $auth1, $auth2, etc. as
800 they are received. Thus, the responses can be made to depend on the
801 challenges. If an invalid string is ignored, an empty string is placed in
802 the variable.
803
30dba1e6
PH
804PH/46 Messages that are created by the autoreply transport now contains a
805 References: header, in accordance with RFCs 2822 and 3834.
806
382afc6b
PH
807PH/47 Added authenticated_sender_force to the smtp transport.
808
a86229cf
PH
809PH/48 The ${prvs expansion was broken on systems where time_t was long long.
810
50c99ba6
PH
811PH/49 Installed latest patch from the Sieve maintainer.
812
d35e429d
PH
813PH/50 When an Exim quota was set without a file count quota, and mailbox_size
814 was also set, the appendfile transport was unnecessarily scanning a
815 directory of message files (e.g. for maildir delivery) to find the count
816 of files (along with the size), even though it did not need this
817 information. It now does the scan only if it needs to find either the
818 size of the count of files.
819
f90d018c
PH
820PH/51 Added ${time_eval: to convert Exim time strings into seconds.
821
75def545
PH
822PH/52 Two bugs concerned with error handling when the smtp transport is
823 used in LMTP mode:
824
825 (i) Exim was not creating retry information for temporary errors given
826 for individual recipients after the DATA command when the smtp transport
827 was used in LMTP mode. This meant that they could be retried too
828 frequently, and not timed out correctly.
829
830 (ii) Exim was setting the flag that allows error details to be returned
831 for LMTP errors on RCPT commands, but not for LMTP errors for individual
832 recipients that were returned after the DATA command.
833
834PH/53 This is related to PH/52, but is more general: for any failing address,
835 when detailed error information was permitted to be returned to the
836 sender, but the error was temporary, then after the final timeout, only
837 "retry timeout exceeded" was returned. Now it returns the full error as
838 well as "retry timeout exceeded".
839
c46782ef
PH
840PH/54 Added control=allow_auth_unadvertised, as it seems there are clients that
841 do this, and (what is worse) MTAs that accept it.
842
71fafd95
PH
843PH/55 Added the add_header modified to ACLs. The use of "message" with "warn"
844 will now be deprecated.
845
2c5db4fd
PH
846PH/56 New os.c-cygwin from the Cygwin maintainer.
847
9cf6b11a
JJ
848JJ/06 exipick: added --unsorted option to allow unsorted output in all output
849 formats (previously only available in exim formats via -bpr, -bpru,
850 and -bpra. Now also available in native and exiqgrep formats)
851
852JJ/07 exipick: added --freeze and --thaw options to allow faster interaction
853 with very large, slow to parse queues
854
855JJ/08 exipick: added ! as generic prefix to negate any criteria format
856
857JJ/09 exipick: miscellaneous performance enhancements (~24% improvements)
858
898d150f
PH
859PH/57 Tidies in SMTP dialogue display in debug output: (i) It was not showing
860 responses to authentication challenges, though it was showing the
861 challenges; (ii) I've removed the CR characters from the debug output for
862 SMTP output lines.
863
46218253
PH
864PH/58 Allow for the insertion of a newline as well as a space when a string
865 is turned into more than one encoded-word during RFC 2047 encoding. The
866 Sieve code now uses this.
867
e97957bc
PH
868PH/59 Added the following errors that can be detected in retry rules: mail_4xx,
869 data_4xx, lost_connection, tls_required.
870
81e509d7
PH
871PH/60 When a VRFY deferred or FAILED, the log message rather than the user
872 message was being sent as an SMTP response.
873
3d240ff7
PH
874PH/61 Add -l and -k options to exicyclog.
875
b37c4101
PH
876PH/62 When verifying, if an address was redirected to one new address, so that
877 verification continued, and the new address failed or deferred after
878 having set something in $address_data, the value of $address_data was not
879 passed back to the ACL. This was different to the case when no
880 redirection occurred. The value is now passed back in both cases.
881
79378e0f
PH
882PH/63 Changed the macro HAVE_LOGIN_CAP (see PH/41 for this release above) to
883 HAVE_SETCLASSRESOURCES because there are different APIs in use that all
884 use login_cap.h, so on its own it isn't the distinguishing feature. The
885 new name refers directly to the setclassresources() function.
886
e49c7bb4
PH
887PH/65 Added configuration files for NetBSD3.
888
d114ec46
PH
889PH/66 Updated OS/Makefile-HP-UX for gcc 4.1.0 with HP-UX 11.
890
f3d7df6c
PH
891PH/67 Fixed minor infelicity in the sorting of addresses to ensure that IPv6
892 is preferred over IPv4.
893
715ab376
PH
894PH/68 The bounce_return_message and bounce_return_body options were not being
895 honoured for bounces generated during the reception of non-SMTP messages.
896 In particular, this applied to messages rejected by the ACL. This bug has
897 been fixed. However, if bounce_return_message is true and bounce_return_
898 body is false, the headers that are returned for a non-SMTP message
899 include only those that have been read before the error was detected.
900 (In the case of an ACL rejection, they have all been read.)
901
6b31b150
PH
902PH/69 The HTML version of the specification is now built in a directory called
903 spec_html instead of spec.html, because the latter looks like a path with
904 a MIME-type, and this confuses some software.
905
906PH/70 Catch two compiler warnings in sieve.c.
907
d515a917
PH
908PH/71 Fixed an obscure and subtle bug (thanks Alexander & Matthias). The
909 function verify_get_ident() calls ip_connect() to connect a socket, but
910 if the "connect()" function timed out, ip_connect() used to close the
911 socket. However, verify_get_ident() also closes the socket later, and in
912 between Exim writes to the log, which may get opened at this point. When
913 the socket was closed in ip_connect(), the log could get the same file
914 descriptor number as the socket. This naturally causes chaos. The fix is
915 not to close the socket in ip_connect(); the socket should be closed by
916 the function that creates it. There was only one place in the code where
917 this was missing, in the iplookup router, which I don't think anybody now
918 uses, but I've fixed it anyway.
919
9b8fadde
PH
920PH/72 Make dns_again_means_nonexist apply to lookups using gethostbyname() as
921 well as to direct DNS lookups. Otherwise the handling of names in host
922 lists is inconsistent and therefore confusing.
923
214e2000 924
5de37277
PH
925Exim version 4.60
926-----------------
927
cc38ddbf
PH
928PH/01 Two changes to the default runtime configuration:
929
930 (1) Move the checks for relay_from_hosts and authenticated clients from
931 after to before the (commented out) DNS black list checks.
932
933 (2) Add control=submission to the relay_from_hosts and authenticated
934 clients checks, on the grounds that messages accepted by these
935 statements are most likely to be submissions.
5de37277 936
72fdd6ae
PH
937PH/02 Several tidies to the handling of ${prvs and ${prvscheck:
938
939 (1) Generate an error if the third argument for the ${prvs expansion is
940 not a single digit.
941
942 (2) Treat a missing third argument of ${prvscheck as if it were an empty
943 string.
944
945 (3) Reset the variables that are obtained from the first argument of
946 ${prvscheck and used in the second argument before leaving the code,
947 because their memory is reclaimed, so using them afterwards may do
948 silly things.
949
950 (4) Tidy up the code for expanding the arguments of ${prvscheck one by
951 one (it's much easier than Tom thought :-).
952
953 (5) Because of (4), we can now allow for the use of $prvscheck_result
954 inside the third argument.
cb9328de 955
cb741023
PH
956PH/03 For some reason, the default setting of PATH when running a command from
957 a pipe transport was just "/usr/bin". I have changed it to
958 "/bin:/usr/bin".
959
f174f16e
PH
960PH/04 SUPPORT_TRANSLATE_IP_ADDRESS and MOVE_FROZEN_MESSAGES did not cause
961 anything to be listed in the output from -bV.
b2f5a032 962
c25242d7
PH
963PH/05 When a filter generated an autoreply, the entire To: header line was
964 quoted in the delivery log line, like this:
965
966 => >A.N.Other <ano@some.domain> <original@ddress> ...
967
968 This has been changed so that it extracts the operative address. There
969 may be more than one such address. If so, they are comma-separated, like
970 this:
971
972 => >ano@some.domain,ona@other.domain <original@ddress> ...
973
82c19f95
PH
974PH/06 When a client host used a correct literal IP address in a HELO or EHLO
975 command, (for example, EHLO [1.2.3.4]) and the client's IP address was
976 not being looked up in the rDNS to get a host name, Exim was showing the
977 IP address twice in Received: lines, even though the IP addresses were
978 identical. For example:
979
980 Received: from [1.2.3.4] (helo=[1.2.3.4])
981
982 However, if the real host name was known, it was omitting the HELO data
983 if it matched the actual IP address. This has been tidied up so that it
984 doesn't show the same IP address twice.
985
d7ffbc12
PH
986PH/07 When both +timestamp and +memory debugging was on, the value given by
987 $tod_xxx expansions could be wrong, because the tod_stamp() function was
988 called by the debug printing, thereby overwriting the timestamp buffer.
989 Debugging no longer uses the tod_stamp() function when +timestamp is set.
990
9f526266
PH
991PH/08 When the original message was included in an autoreply transport, it
992 always said "this is a copy of the message, including all the headers",
993 even if body_only or headers_only was set. It now gives an appropriate
994 message.
995
87fcc8b9
PH
996PH/09 Applied a patch from the Sieve maintainer which:
997
998 o fixes some comments
999 o adds the (disabled) notify extension core
1000 o adds some debug output for the result of if/elsif tests
1001 o points to the current vacation draft in the documentation
1002 and documents the missing references header update
1003
1004 and most important:
1005
1006 o fixes a bug in processing the envelope test (when testing
1007 multiple envelope elements, the last element determinted the
1008 result)
1009
456682f5
PH
1010PH/10 Exim was violating RFC 3834 ("Recommendations for Automatic Responses to
1011 Electronic Mail") by including:
1012
1013 Auto-submitted: auto-generated
1014
1015 in the messages that it generates (bounce messages and others, such as
1016 warnings). In the case of bounce messages for non-SMTP mesages, there was
1017 also a typo: it was using "Auto_submitted" (underscore instead of
1018 hyphen). Since every message generated by Exim is necessarily in response
1019 to another message, thes have all been changed to:
1020
1021 Auto-Submitted: auto-replied
1022
1023 in accordance with these statements in the RFC:
1024
1025 The auto-replied keyword:
1026
1027 - SHOULD be used on messages sent in direct response to another
1028 message by an automatic process,
1029
1030 - MUST NOT be used on manually-generated messages,
1031
1032 - MAY be used on Delivery Status Notifications (DSNs) and Message
1033 Disposition Notifications (MDNs),
1034
1035 - MUST NOT be used on messages generated by automatic or periodic
1036 processes, except for messages which are automatic responses to
1037 other messages.
1038
3e46c1aa
PH
1039PH/11 Added "${if def:sender_address {(envelope-from <$sender_address>)\n\t}}"
1040 to the default Received: header definition.
456682f5 1041
49826d12
PH
1042PH/12 Added log selector acl_warn_skipped (default on).
1043
eba0c039
PH
1044PH/13 After a successful wildlsearch lookup, discard the values of numeric
1045 variables because (a) they are in the wrong storage pool and (b) even if
1046 they were copied, it wouldn't work properly because of the caching.
1047
a0d6ba8a
PH
1048PH/14 Add check_rfc2047_length to disable enforcement of RFC 2047 length
1049 checking when decoding. Apparently there are clients that generate
1050 overlong encoded strings. Why am I not surprised?
1051
f0917727
PH
1052PH/15 If the first argument of "${if match_address" was not empty, but did not
1053 contain an "@" character, Exim crashed. Now it writes a panic log message
1054 and treats the condition as false.
1055
096fee00
PH
1056PH/16 In autoreply, treat an empty string for "once" the same as unset.
1057
024bd3c2
PH
1058PH/17 A further patch from the Sieve maintainer: "Introduce the new Sieve
1059 extension "envelope-auth". The code is finished and in agreement with
1060 other implementations, but there is no documentation so far and in fact,
1061 nobody wrote the draft yet. This extension is currently #undef'ed, thus
1062 not changing the active code.
1063
1064 Print executed "if" and "elsif" statements when debugging is used. This
1065 helps a great deal to understand what a filter does.
1066
1067 Document more things not specified clearly in RFC3028. I had all this
1068 sorted out, when out of a sudden new issues came to my mind. Oops."
1069
df199fec
PH
1070PH/18 Exim was not recognizing the "net-" search type prefix in match_ip lists
1071 (Bugzilla #53).
1072
d27f1df3
PH
1073PH/19 Exim expands the IPv6 address given to -bh to its full non-abbreviated
1074 canonical form (as documented). However, after a host name lookup from
1075 the IP address, check_host() was doing a simple string comparison with
1076 addresses acquired from the DNS when checking that the found name did
1077 have the original IP as one of its addresses. Since any found IPv6
1078 addresses are likely to be in abbreviated form, the comparison could
1079 fail. Luckily, there already exists a function for doing the comparison
1080 by converting both addresses to binary, so now that is used instead of
1081 the text comparison.
1082
96776534
PH
1083PH/20 There was another similar case to PH/19, when a complete host name was
1084 given in a host list; looking up its IP address could give an abbreviated
1085 form, whereas the current host's name might or might not be abbreviated.
1086 The same fix has been applied.
1087
5de37277 1088
9a799bc0
PH
1089Exim version 4.54
1090-----------------
1091
1092PH/01 The ${base62: operator adjusted itself to base 36 when BASE_62 was
1093 set to 36 (for Darwin and Cygwin), but the ${base62d: operator did not.
1094 It now does.
1095
99a4b039
PH
1096PH/02 Two minor problems detected in Cygwin: the os.{c,h} files had lost */ on
1097 the CVS lines, and there was a missing #if HAVE_IPV6 in host.c.
1098
1099PH/03 Typo: missing ".o" in src/pcre/Makefile.
1100
4b233853
PH
1101PH/04 Tighten up "personal" tests: Instead of testing for any "List-"
1102 header line, restrict the check to what is listed in RFCs 2369 and 2929.
1103 Also, for "Auto-Submitted", treat anything other than "no" as
1104 non-personal, in accordance with RFC 3834. (Previously it treated
1105 anything starting "auto-" as non-personal.)
1106
8857ccfd
PH
1107TF/01 The control=submission/name=... option had a problem with syntax
1108 errors if the name included a slash character. The /name= option
1109 now slurps the rest of the string, so it can include any characters
1110 but it must come last in the list of options (after /sender_retain
1111 or /domain=).
1112
433a2980
PH
1113PH/05 Some modifications to the interface to the fake nameserver for the new
1114 testing suite.
1115
3e46c1aa 1116
9a799bc0 1117
e3a311ba
TK
1118Exim version 4.53
1119-----------------
1120
1121TK/01 Added the "success_on_redirect" address verification option. See
1122 NewStuff for rationale and an example.
1123
13b685f9
PH
1124PH/01 Added support for SQLite, basic code supplied by David Woodhouse.
1125
395ff96d
PH
1126PH/02 Patch to exigrep to allow it to work on syslog lines.
1127
5b68f6e4
PH
1128PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
1129 fread() to skip over the body file's header line, because in Cygwin the
1130 header line is locked and is inaccessible.
1131
1ab52c69
PH
1132PH/04 Added $message_exim_id, ultimately to replace $message_id (they will both
1133 co-exist for some time) to make it clear that it is the Exim ID that is
1134 referenced, not the Message-ID: header line.
1135
b07e6aa3
PH
1136PH/05 Replaced all Tom's calls to snprintf() with calls to the internal
1137 string_format() function, because snprintf() does not exist on all
1138 operating systems.
1139
254e032f
PH
1140PH/06 The use of forbid_filter_existstest now also locks out the use of the
1141 ${stat: expansion item.
1142
3af76a81
PH
1143PH/07 Changed "SMTP protocol violation: synchronization error" into "SMTP
1144 protocol synchronization error", to keep the pedants happy.
1145
2548ba04
PH
1146PH/08 Arrange for USE_INET_NTOA_FIX to be set in config.h for AIX systems as
1147 well as for IRIX systems, when gcc is being used. See the host.c source
1148 file for comments.
1149
b6c6011d
PH
1150PH/09 Installed latest Cygwin configuration files from the Cygwin maintainer.
1151
cf39cf57
PH
1152PH/10 Named domain lists were not working if used in a queue_smtp_domains
1153 setting.
1154
f1513293
PH
1155PH/11 Added support for the IGNOREQUOTA extension to LMTP, both to the lmtp
1156 transport and to the smtp transport in LMTP mode.
1157
727549a4
PH
1158TK/02 Remove one case of BASE64 error detection FTTB (undocumented anyway).
1159
af46795e
PH
1160PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
1161 run a filter in a subprocess. This could lead to confusion in subsequent
1162 lookups in the parent process. There should also be a search_tidyup() at
1163 the end of the subprocess.
1164
d7b47fd0
PH
1165PH/13 Previously, if "verify = helo" was set in an ACL, the condition was true
1166 only if the host matched helo_try_verify_hosts, which caused the
1167 verification to occur when the EHLO/HELO command was issued. The ACL just
1168 tested the remembered result. Now, if a previous verification attempt has
1169 not happened, "verify = helo" does it there and then.
1170
ee744174
JJ
1171JJ/01 exipick: added $message_exim_id variable (see 4.53-PH/04)
1172
b582ab87
PH
1173TK/03 Fix log output including CR from clamd.
1174
41a13e0a
PH
1175PH/14 A reference to $reply_address when Reply-to: was empty and From: did not
1176 exist provoked a memory error which could cause a segfault.
1177
f625cc5a
PH
1178PH/15 Installed PCRE 6.2
1179
1180PH/17 Defined BIND_8_COMPAT in the Darwin os.h file.
1181
21f7af35
PH
1182PH/18 Reversed 4.52/PH/17 because the HP-UX user found it wasn't the cause
1183 of the problem. Specifically, suggested +O2 rather than +O1 for the
1184 HP-UX compiler.
1185
31480e42
PH
1186PH/19 Added sqlite_lock_timeout option (David Woodhouse's patch).
1187
2d280592
PH
1188PH/20 If a delivery was routed to a non-standard port by means of an SRV
1189 record, the port was not correctly logged when the outgoing_port log
1190 selector was set (it logged the transort's default port).
1191
7cd1141b
PH
1192PH/21 Added support for host-specific ports to manualroute, queryprogram,
1193 fallback_hosts, and "hosts" in the smtp transport.
1194
1195PH/22 If the log selector "outgoing_port" is set, the port is now also given on
1196 host errors such as "Connection refused".
1197
750af86e
PH
1198PH/23 Applied a patch to fix problems with exim-4.52 while doing radius
1199 authentication with radiusclient 0.4.9:
1200
1201 - Error returned from rc_read_config was caught wrongly
1202 - Username/password not passed on to radius server due to wrong length.
1203
1204 The presumption is that some radiusclient API changes for 4.51/PH/17
1205 were not taken care of correctly. The code is still untested by me (my
1206 Linux distribution still has 0.3.2 of radiusclient), but it was
1207 contributed by a Radius user.
1208
1209PH/24 When doing a callout, the value of $domain wasn't set correctly when
1210 expanding the "port" option of the smtp transport.
1211
4304270b
TK
1212TK/04 MIME ACL: Fix buffer underrun that occurs when EOF condition is met
1213 while reading a MIME header. Thanks to Tom Hughes for a patch.
1214
750af86e
PH
1215PH/24 Include config.h inside local_scan.h so that configuration settings are
1216 available.
1217
64ffc24f
PH
1218PH/25 Make $smtp_command_argument available after all SMTP commands. This means
1219 that in an ACL for RCPT (for example), you can examine exactly what was
1220 received.
1221
5dd9625b
PH
1222PH/26 Exim was recognizing IPv6 addresses of the form [IPv6:....] in EHLO
1223 commands, but it was not correctly comparing the address with the actual
1224 client host address. Thus, it would show the EHLO address in Received:
1225 header lines when this was not necessary.
1226
5591031b
PH
1227PH/27 Added the % operator to ${eval:}.
1228
ba18e66a
PH
1229PH/28 Exim tries to create and chdir to its spool directory when it starts;
1230 it should be ignoring failures (because with -C, for example, it has lost
1231 privilege). It wasn't ignoring creation failures other than "already
1232 exists".
1233
9cec981f
PH
1234PH/29 Added "crypteq" to the list of supported features that Exim outputs when
1235 -bV or -d is used.
1236
aa2b5c79
PH
1237PH/30 Fixed (presumably very longstanding) bug in exim_dbmbuild: if it failed
1238 because an input line was too long, either on its own, or by virtue of
1509d3a8
PH
1239 too many continuations, the temporary file was not being removed, and the
1240 return code was incorrect.
aa2b5c79 1241
48a53b7f
PH
1242PH/31 Missing "BOOL" in function definition in filtertest.c.
1243
1c59d63b
PH
1244PH/32 Applied Sieve patches from the maintainer.
1245
671012da
TK
1246TK/05 Domainkeys: Accomodate for a minor API change in libdomainkeys 0.67.
1247
1509d3a8
PH
1248PH/33 Added "verify = not_blind".
1249
1250PH/34 There are settings for CHOWN_COMMAND and MV_COMMAND that can be used in
1251 Local/Makefile (with some defaults set). These are used in built scripts
1252 such as exicyclog, but they have never been used in the exim_install
1253 script (though there are many overriding facilities there). I have
1254 arranged that the exim_install script now takes note of these two
1255 settings.
1256
1257PH/35 Installed configuration files for Dragonfly.
1258
2fe1a124
PH
1259PH/36 When a locally submitted message by a trusted user did not contain a
1260 From: header, and the sender address was obtained from -f or from an SMTP
1261 MAIL command, and the trusted user did not use -F to supply a sender
1262 name, $originator_name was incorrectly used when constructing a From:
1263 header. Furthermore, $originator_name was used for submission mode
1264 messages from external hosts without From: headers in a similar way,
1265 which is clearly wrong.
1266
8800895a
PH
1267PH/37 Added control=suppress_local_fixups.
1268
ccfdb010
PH
1269PH/38 When log_selector = +received_sender was set, and the addition of the
1270 sender made the log line's construction buffer exactly full, or one byte
1271 less than full, an overflow happened when the terminating "\n" was
1272 subsequently added.
1273
1130bfb0
PH
1274PH/39 Added a new log selector, "unknown_in_list", which provokes a log entry
1275 when the result of a list match is failure because a DNS lookup failed.
1276
ebcb507f
PH
1277PH/40 RM_COMMAND is now used in the building process.
1278
c35e155c
PH
1279PH/41 Added a "distclean" target to the top-level Makefile; it deletes all
1280 the "build-* directories that it finds.
1281
95d1f782
PH
1282PH/42 (But a TF fix): In a domain list, Exim incorrectly matched @[] if the IP
1283 address in a domain literal was a prefix of an interface address.
1284
fd6de02e
PH
1285PH/43 (Again a TF fix): In the dnslookup router, do not apply widen_domains
1286 when verifying a sender address, unless rewrite_headers is false.
1287
58de37c5
PH
1288PH/44 Wrote a long comment about why errors_to addresses are verified as
1289 recipients, not senders.
1290
261cf466
TF
1291TF/01 Add missing LIBS=-lm to OS/Makefile-OpenBSD which was overlooked when
1292 the ratelimit ACL was added.
1293
3ee512ff
PH
1294PH/45 Added $smtp_command for the full command (cf $smtp_command_argument).
1295
e08c430f
PH
1296PH/46 Added extra information about PostgreSQL errors to the error string.
1297
bef5a11f
PH
1298PH/47 Added an interface to a fake DNS resolver for use by the new test suite,
1299 avoiding the need to install special zones in a real server. This is
1300 backwards compatible; if it can't find the fake resolver, it drops back.
1301 Thus, both old and new test suites can be run.
1302
7546de58
TF
1303TF/02 Added util/ratelimit.pl
1304
e5d5a95f
TF
1305TF/03 Minor fix to the ratelimit code to improve its behaviour in case the
1306 clock is set back in time.
1307
2e88a017
TF
1308TF/04 Fix the ratelimit support in exim_fixdb. Patch provided by Brian
1309 Candler <B.Candler@pobox.com>.
1310
a5f65aa4
TF
1311TF/05 The fix for PH/43 was not completely correct; widen_domains is always
1312 OK for addresses that are the result of redirections.
1313
e7726cbf
PH
1314PH/48 A number of further additions for the benefit of the new test suite,
1315 including a fake gethostbyname() that interfaces to the fake DNS resolver
1316 (see PH/47 above).
1317
a7fdad5b
TF
1318TF/06 The fix for widen_domains has also been applied to qualify_single and
1319 search_parents which are the other dnslookup options that can cause
1320 header rewrites.
1321
6af56900
PH
1322PH/49 Michael Haardt's randomized retrying, but as a separate retry parameter
1323 type ("H").
1324
0925ede6
PH
1325PH/50 Make never_users, trusted_users, admin_groups, trusted_groups expandable.
1326
66afa403
TF
1327TF/07 Exim produced the error message "an SRV record indicated no SMTP
1328 service" if it encountered an MX record with an empty target hostname.
1329 The message is now "an MX or SRV record indicated no SMTP service".
1330
0154e85a
TF
1331TF/08 Change PH/13 introduced the possibility that verify=helo may defer,
1332 if the DNS of the sending site is misconfigured. This is quite a
1333 common situation. This change restores the behaviour of treating a
1334 helo verification defer as a failure.
1335
16f12c76
PH
1336PH/51 If self=fail was set on a router, the bounce message did not include the
1337 actual error message.
1338
bbe902f0 1339
e5a9dba6
PH
1340Exim version 4.52
1341-----------------
1342
1343TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
1344
22c3b60b
PH
1345PH/01 When a transport filter timed out in a pipe delivery, and the pipe
1346 command itself ended in error, the underlying message about the transport
1347 filter timeout was being overwritten with the pipe command error. Now the
1348 underlying error message should be appended to the second error message.
1349
06a9b4b5
PH
1350TK/01 Fix poll() being unavailable on Mac OSX 10.2.
1351
c1ac6996
PH
1352PH/02 Reduce the amount of output that "make" produces by default. Full output
1353 can still be requested.
1354
9c7a242c
PH
1355PH/03 The warning log line about a condition test deferring for a "warn" verb
1356 was being output only once per connection, rather than after each
1357 occurrence (because it was using the same function as for successful
1358 "warn" verbs). This seems wrong, so I have changed it.
1359
87ba3f5f
PH
1360TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
1361 it should not have, which might have caused a crash in the right
1362 circumstances, but probably never did.
1363
1364PH/04 Installed a modified version of Tony Finch's patch to make submission
1365 mode fix the return path as well as the Sender: header line, and to
1366 add a /name= option so that you can make the user's friendly name appear
1367 in the header line.
1368
29aba418
TF
1369TF/03 Added the control = fakedefer ACL modifier.
1370
fe0dab11
TF
1371TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
1372 Mark Lowes for thorough testing.
870f6ba8 1373
11d337a4
TK
1374TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
1375
1376TK/03 Merged latest SRS patch from Miles Wilton.
1377
415c8f3b
PH
1378PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
1379 with the definition in sysexits.h (which is #included earlier).
1380 Fortunately, Exim does not actually use EX_OK. The code used to try to
1381 preserve the sysexits.h value, by assumimg that macro definitions were
1382 scanned for macro replacements. I have been disabused of this notion,
1383 so now the code just undefines EX_OK before #including unistd.h.
11d337a4 1384
958541e9
PH
1385PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
1386 in the smtp transport. When a block could not be written in a single
1387 write() function, the timeout was being re-applied to each part-write.
1388 This seems wrong - if the receiver was accepting one byte at a time it
1389 would take for ever. The timeout is now adjusted when this happens. It
1390 doesn't have to be particularly precise.
1391
c206415f
TK
1392TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
1393 details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
1394
2a4be8f9
PH
1395PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
1396 without a domain if the check to <postmaster@domain> fails.
1397
1cba11c5
SC
1398SC/01 Eximstats: added -xls and the ability to specify output files
1399 (patch written by Frank Heydlauf).
1400
1401SC/02 Eximstats: use FileHandles for outputing results.
1402
1403SC/03 Eximstats: allow any combination of xls, txt, and html output.
1404
1405SC/04 Eximstats: fixed display of large numbers with -nvr option
1406
1407SC/05 Eximstats: fixed merging of reports with empty tables.
1408
1409SC/06 Eximstats: added the -include_original_destination flag
1410
1411SC/07 Eximstats: removed tabs and trailing whitespace.
1412
1005d00e
TK
1413TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
1414
1415TK/06 MBOX spool code: Add real "From " MBOX separator line
1416 so the .eml file is really in mbox format (even though
1417 most programs do not really care). Patch from Alex Miller.
1418
1419TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
1420 The latter is generated from $received_to and is only set if the
1421 message has one envelope recipient. SA can use these headers,
1422 obviously out-of-the-box. Patch from Alex Miller.
1423
9b4768fa
PH
1424PH/08 The ${def test on a variable was returning false if the variable's
1425 value was "0", contrary to what the specification has always said!
1426 The result should be true unless the variable is empty.
1427
1428PH/09 The syntax error of a character other than { following "${if
1429 def:variable_name" (after optional whitespace) was not being diagnosed.
1430 An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
1431 accidental colon was present, for example, could give incorrect results.
1432
0d7eb84a
PH
1433PH/10 Tidied the code in a number of places where the st_size field of a stat()
1434 result is used (not including appendfile, where other changes are about
1435 to be made).
1436
1437PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
1438 This involved changing a lot of size variables from int to off_t. It
1439 should work with maildirs and everything.
1440
40727bee
TK
1441TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
1442 spamd dying while we are connected to it.
1443
554d2369
TF
1444TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
1445 <jgh@wizmail.org>
1446
1f922db1
PH
1447PH/12 Applied Alex Kiernan's patch for the API change for the error callback
1448 function for BDB 4.3.
1449
ef213c3b
PH
1450PH/13 Changed auto_thaw such that it does not apply to bounce messages.
1451
8ac170f3
PH
1452PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
1453 the sources for PCRE have been re-arranged and more files are now
1454 involved.
1455
b1c749bb
PH
1456PH/15 The code I had for printing potentially long long variables in PH/11
1457 above was not the best (it lost precision). The length of off_t variables
1458 is now inspected at build time, and an appropriate printing format (%ld
c6c2dc1d
PH
1459 or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
1460 to be "long long int" or "long int". This is needed for the internal
1461 formatting function string_vformat().
b1c749bb 1462
4aac9b49
PH
1463PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
1464 the configuration file to be ":syslog", then the script "guesses" where
1465 the logs files are, rather than using the compiled in default. In our
1466 case the guess is not the same as the compiled default, so the script
1467 suddenly stopped working when I started to use syslog. The patch checks
1468 to see if log_file_path is "". If so, it attempts to read it from exim
1469 with no configuration file to get the compiled in version, before it
1470 falls back to the previous guessing code."
1471
294520c8
TK
1472TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
1473 implementing BATV in an Exim configuration. See NewStuff for the gory
1474 details.
1475
5bd022fe
PH
1476PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
1477 Makefile that are specific to HP-UX.
1478
90e9ce59
PH
1479PH/18 If the "use_postmaster" option was set for a recipient callout together
1480 with the "random" option, the postmaster address was used as the MAIL
1481 FROM address for the random test, but not for the subsequent recipient
1482 test. It is now used for both.
1483
5ea81592
PH
1484PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
1485 patch removes a few documentation additions to RFC 3028, because the
1486 latest draft now contains them. It adds the new en;ascii-case comparator
1487 and a new error check for 8bit text in MIME parts. Comparator and
1488 require names are now matched exactly. I enabled the subaddress
1489 extension, but it is not well tested yet (read: it works for me)."
1490
c6c2dc1d
PH
1491PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
1492 rework some of the code of TK/09 above to avoid the hardwired use of
1493 "%lld" and "long long". Replaced the call to snprintf() with a call to
1494 string_vformat().
1495
fffffe4c
PH
1496PH/21 Added some other messages to those in 4.51/PH/42, namely "All relevant MX
1497 records point to non-existent hosts", "retry timeout exceeded", and
1498 "retry time not reached for any host after a long failure period".
ca02eafb 1499
9a26b6b2
PH
1500PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
1501 experimental DomainKeys support:
1502
1503 (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
1504 (2) On an error such as an illegally used "control", the wrong name for
1505 the control was given.
1506
1507 These problems did NOT occur unless DomainKeys support was compiled.
1508
4aee0225
PH
1509PH/23 Added daemon_startup_retries and daemon_startup_sleep.
1510
32d668a5
PH
1511PH/24 Added ${if match_ip condition.
1512
8187c3f3
PH
1513PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
1514 databases so that it will be absolutely obvious if a crash occurs in the
1515 DB library. This is a regular occurrence (often caused by mis-matched
1516 db.h files).
1517
ff790e47 1518PH/26 Insert a lot of missing (void) casts for functions such as chown(),
f1e894f3
PH
1519 chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
1520 picked up on a user's system that detects such things. There doesn't seem
1521 to be a gcc warning option for this - only an attribute that has to be
1522 put on the function's prototype. It seems that in Fedora Core 4 they have
1523 set this on a number of new functions. No doubt there will be more in due
1524 course.
ff790e47 1525
5417f6d1
PH
1526PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
1527 specify a transport. However, if an address that was verified by such a
1528 router was the subject of a callout, Exim crashed because it tried to
1529 read the rcpt_include_affixes from the non-existent transport. Now it
1530 just assumes that the setting of that option is false. This bug was
1531 introduced by 4.51/PH/31.
1532
59cf8544
PH
1533PH/28 Changed -d+all to exclude +memory, because that information is very
1534 rarely of interest, but it makes the output a lot bigger. People tend to
1535 do -d+all out of habit.
1536
e7ad8a65
PH
1537PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
1538 code in os-type was giving problems when libc.so lives in lib64, like on
1539 x86_64 Fedora Core.
1540
ade42478
PH
1541PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
1542 aren't the modern standard, and it seems that some systems' include files
1543 don't always have them. Exim was already checking for some of the newer
1544 ones like T_AAAA, and defining it itself. I've added checks for all the
1545 record types that Exim uses.
1546
182ad5cf
PH
1547PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
1548 not automatically generating a new one, as it is supposed to. This
1549 prevented TLS from working. If the file did exist, but contained invalid
1550 data, a new version was generated, as expected. It was only the case of a
1551 non-existent file that was broken.
1552
b0d9fc80
TK
1553TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
1554 with a change in libdomainkeys > 0.64.
1555
1556TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
1557 from DNS. If the selector record carries the flag, it now has
1558 precedence over the domain-wide flag.
1559
1560TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.
1561
47c7a64a
PH
1562PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
1563 the use of a port name that isn't defined in /etc/services) occurred, the
1564 message was deferred as in a normal delivery, and thus remained on the
1565 spool, instead of being failed because of the mua_wrapper setting. This
1566 is now fixed, and I tidied up some of the mua_wrapper messages at the
1567 same time.
1568
a388bce4
SC
1569SC/08 Eximstats: whilst parsing the mainlog(s), store information about
1570 the messages in a hash of arrays rather than using individual hashes.
1571 This is a bit cleaner and results in dramatic memory savings, albeit
1572 at a slight CPU cost.
1573
1574SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
1575 as requested by Marc Sherman.
1576
1577SC/10 Eximstats: added histograms for user specified patterns as requested
1578 by Marc Sherman.
1579
0793e4ed
SC
1580SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.
1581
c58b88df
PH
1582PH/33 Patch from the Cygwin maintainer to add "b" to all occurences of
1583 fopen() in the content-scanning modules that did not already have it.
1584
e7ad8a65 1585
7982096b
PH
1586Exim version 4.51
1587-----------------
1588
1a46a8c5
PH
1589TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
1590 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
1591
2f079f46 1592TK/02 Fix ACL "control" statement not being available in MIME ACL.
1a46a8c5
PH
1593
1594TK/03 Fix ACL "regex" condition not being available in MIME ACL.
1595
1596PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
1597 to test Sieve filters that use "vacation".
1598
1599PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
1600 that changes the way the GnuTLS parameters are stored in the cache file.
1601 The new format can be generated externally. For backward compatibility,
1602 if the data in the cache doesn't make sense, Exim assumes it has read an
1603 old-format file, and it generates new data and writes a new file. This
1604 means that you can't go back to an older release without removing the
1605 file.
1606
1607PH/03 A redirect router that has both "unseen" and "one_time" set does not
1608 work if there are any delivery delays because "one_time" forces the
1609 parent to be marked "delivered", so its unseen clone is never tried
1610 again. For this reason, Exim now forbids the simultaneous setting of
1611 these two options.
1612
1613PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
1614 redirected to themselves ("homonym" addresses). Read the long ChangeLog
1615 entry if you want to know the details. The fix, however, neglected to
1616 consider the case when local delivery batching is involved. The test for
1617 "previously delivered" was not happening when checking to see if an
1618 address could be batched with a previous (undelivered) one; under
1619 certain circumstances this could lead to multiple deliveries to the same
c2c19e9d 1620 address.
1a46a8c5
PH
1621
1622PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
1623 in its include files, and this causes problems building Exim.
1624
1625PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
1626 header_syntax) but Exim was just ignoring anything given after a slash.
1627 In particular, this caused confusion with an attempt to use "verify =
1628 reverse_host_lookup/defer_ok". An error is now given when options are
1629 supplied for verify items that do not have them. (Maybe reverse_host_
1630 lookup should have a defer_ok option, but that's a different point.)
1631
1632PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
1633 defined by RFC 821) to 2048, because there were problems with some AUTH
1634 commands, and RFC 1869 says the size should be increased for extended
1635 SMTP commands that take arguments.
1636
1637PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
1638 Finch).
1639
1640PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
1641 "unknown" error; now it says that the functionality isn't in the binary.
8d67ada3 1642
49c2d5ea
PH
1643PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
1644 an address' error message when a string expansion fails (syntax or
f331f3b6
PH
1645 whatever). Otherwise the password may appear in the log. Following change
1646 PH/42 below, there is no longer a chance of it appearing in a bounce
1647 message.
49c2d5ea 1648
bf759a8b
PH
1649PH/11 Installed exipick version 20050225.0 from John Jetmore.
1650
83364d30
PH
1651PH/12 If the last host in a fallback_hosts list was multihomed, only the first
1652 of its addresses was ever tried. (Bugzilla bug #2.)
1653
7999bbd7
PH
1654PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
1655 the result incorrectly in the debug output. (It correctly added a newline
1656 to what was transported.)
1657
7dbf77c9
PH
1658TF/01 Added $received_time.
1659
74e0617f
PH
1660PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
1661 commented out examples of how to interface to a virus scanner and to
1662 SpamAssassin. Also added commented examples of av_scanner and
1663 spamd_address settings.
1664
2f079f46
PH
1665PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
1666 and controls are allowed in which ACLs. There were a couple of minor
1667 errors. Some of the entries in the conditions table (which is a table of
1668 where they are NOT allowed) were getting very unwieldy; rewrote them as a
1669 negation of where the condition IS allowed.
1670
8c841523
PH
1671PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
1672
7766a4f0
PH
1673PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
1674 header file does not have a version number, so I've had to invent a new
1675 value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
1676 API. The code is untested by me (my Linux distribution still has 0.3.2 of
1677 radiusclient), but it was contributed by a Radius user.
1678
8b417f2c
PH
1679PH/18 Installed Lars Mainka's patch for the support of CRL collections in
1680 files or directories, for OpenSSL.
1681
901f42cb
PH
1682PH/19 When an Exim process that is running as root has to create an Exim log
1683 file, it does so in a subprocess that runs as exim:exim so as to get the
1684 ownership right at creation (otherwise, other Exim processes might see
1685 the file with the wrong ownership). There was no test for failure of this
1686 fork() call, which would lead to the process getting stuck as it waited
1687 for a non-existent subprocess. Forks do occasionally fail when resources
1688 run out. I reviewed all the other calls to fork(); they all seem to check
1689 for failure.
1690
f9b9210e
PH
1691PH/20 When checking for unexpected SMTP input at connect time (before writing
1692 the banner), Exim was not dealing correctly with a non-positive return
1693 from the read() function. If the client had disconnected by this time,
1694 the result was a log entry for a synchronization error with an empty
1695 string after "input=" when read() returned zero. If read() returned -1
1696 (an event I could not check), uninitialized data bytes were printed.
1697 There were reports of junk text (parts of files, etc) appearing after
1698 "input=".
1699
54cdb463
PH
1700PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
1701
cf00dad6
PH
1702PH/22 Added support for macro redefinition, and (re)definition in between
1703 driver and ACL definitions.
1704
acb1b346
PH
1705PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
1706 forgetting to use the resulting value; it was using the unexpanded value.
1707
c5ddb310
PH
1708PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
1709 hadn't been configured. The fix is from Juergen Kreileder, who
1710 understands it better than I do:
1711
1712 "Here's what I see happening with three configured cyrus_sasl
1713 authenticators configured (plain, login, cram-md5):
1714
1715 On startup auth_cyrus_sasl_init() gets called for each of these.
1716 This means three calls to sasl_listmech() without a specified mech_list.
1717 => SASL tests which mechs of all available mechs actually work
1718 => three warnings about OTP not working
1719 => the returned list contains: plain, login, cram-md5, digest-md5, ...
1720
1721 With the patch, sasl_listmech() also gets called three times. But now
1722 SASL's mech_list option is set to the server_mech specified in the the
1723 authenticator. Or in other words, the answer from sasl_listmech()
1724 gets limited to just the mech you're testing for (which is different
1725 for each call.)
1726 => the return list contains just 'plain' or 'login', 'cram-md5' or
1727 nothing depending on the value of ob->server_mech.
1728
1729 I've just tested the patch: Authentication still works fine,
1730 unavailable mechs specified in the exim configuration are still
1731 caught, and the auth.log warnings about OTP are gone."
1732
31619da6
PH
1733PH/25 When debugging is enabled, the contents of the command line are added
1734 to the debugging output, even when log_selector=+arguments is not
1735 specified.
1736
bebaf0fc
PH
1737PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
1738 answer is "GNU", and only if the return is "GNU/something" is the answer
1739 "Linux".
1740
475fe28a
PH
1741PH/27 $acl_verify_message is now set immediately after the failure of a
1742 verification in an ACL, and so is available in subsequent modifiers. In
1743 particular, the message can be preserved by coding like this:
1744
1745 warn !verify = sender
1746 set acl_m0 = $acl_verify_message
1747
1748 Previously, $acl_verify_message was set only while expanding "message"
1749 and "log_message" when a very denied access.
1750
7e8bec7a
PH
1751PH/28 Modified OS/os.c-Linux with
1752
1753 -#ifndef OS_LOAD_AVERAGE
1754 +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
1755
1756 to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
1757 nomenclature these days.)
1758
e4a89c47
PH
1759PH/29 Installed patch from the Sieve maintainer that adds the options
1760 sieve_useraddress and sieve_subaddress to the redirect router.
1761
5ca2a9a1
PH
1762PH/30 In these circumstances:
1763 . Two addresses routed to the same list of hosts;
1764 . First host does not offer TLS;
1765 . First host accepts first address;
1766 . First host gives temporary error to second address;
1767 . Second host offers TLS and a TLS session is established;
1768 . Second host accepts second address.
1769 Exim incorrectly logged both deliveries with the TLS parameters (cipher
1770 and peerdn, if requested) that were in fact used only for the second
1771 address.
7e8bec7a 1772
c688b954
PH
1773PH/31 When doing a callout as part of verifying an address, Exim was not paying
1774 attention to any local part prefix or suffix that was matched by the
1775 router that accepted the address. It now behaves in the same way as it
1776 does for delivery: the affixes are removed from the local part unless
1777 rcpt_include_affixes is set on the transport.
1778
fed77020
PH
1779PH/32 Add the sender address, as F=<...>, to the log line when logging a
1780 timeout during the DATA phase of an incoming message.
1781
7fe1560f
PH
1782PH/33 Sieve envelope tests were broken for match types other than :is. I have
1783 applied a patch sanctioned by the Sieve maintainer.
c688b954 1784
ebb6e6d5
PH
1785PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
1786 the uid or gid is negative. A case of a negative gid caused this to be
1787 noticed. The fix allows for either to be negative.
1788
9c4e8f60
PH
1789PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
1790 clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
1791 overlooked.
1792
1793PH/36 The change PH/12 above was broken. Fixed it.
1794
d7174846
PH
1795PH/37 Exim used to check for duplicate addresses in the middle of routing, on
1796 the grounds that routing the same address twice would always produce the
1797 same answer. This might have been true once, but it is certainly no
1798 longer true now. Routing a child address may depend on the previous
1799 routing that produced that child. Some complicated redirection strategies
1800 went wrong when messages had multiple recipients, and made Exim's
1801 behaviour dependent on the order in which the addresses were given.
1802
1803 I have moved the duplicate checking until after the routing is complete.
1804 Exim scans the addresses that are assigned to local and remote
1805 transports, and removes any duplicates. This means that more work will be
1806 done, as duplicates will always all be routed, but duplicates are
1807 presumably rare, so I don't expect this is of any significance.
1808
1809 For deliveries to pipes, files, and autoreplies, the duplicate checking
1810 still happens during the routing process, since they are not going to be
1811 routed further.
1812
cfe75fc3
PH
1813PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
1814 It corrects a timeout issue with spamd. This is Ian's comment: "The
1815 background is that sometimes spamd either never reads data from a
1816 connection it has accepted, or it never writes response data. The exiscan
1817 spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
1818 blindly assumes that writes won't block so it may never time out."
1819
be22d70e
PH
1820PH/39 Allow G after quota size as well as K and M.
1821
0612b098
PH
1822PH/40 The value set for $authenticated_id in an authenticator may not contain
1823 binary zeroes or newlines because the value is written to log lines and
1824 to spool files. There was no check on this. Now the value is run through
1825 the string_printing() function so that such characters are converted to
1826 printable escape sequences.
1827
2e0c1448
PH
1828PH/41 $message_linecount is a new variable that contains the total number of
1829 lines in the message. Compare $body_linecount, which is the count for the
1830 body only.
1831
447d236c
PH
1832PH/42 Exim no longer gives details of delivery errors for specific addresses in
1833 bounce and delay warning messages, except in certain special cases, which
1834 are as follows:
1835
1836 (a) An SMTP error message from a remote host;
1837 (b) A message specified in a :fail: redirection;
1838 (c) A message specified in a "fail" command in a system filter;
1839 (d) A message specified in a FAIL return from the queryprogram router;
1840 (e) A message specified by the cannot_route_message router option.
1841
1842 In these cases only, Exim does include the error details in bounce and
1843 warning messages. There are also a few cases where bland messages such
1844 as "unrouteable address" or "local delivery error" are given.
1845
d20976dc
PH
1846PH/43 $value is now also set for the "else" part of a ${run expansion.
1847
f656d135
PH
1848PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
1849 being worked on, but at least Exim now implements the latest version to
1850 play with."
1851
2e2a30b4
PH
1852PH/45 In a pipe transport, although a timeout while waiting for the pipe
1853 process to complete was treated as a delivery failure, a timeout while
1854 writing the message to the pipe was logged, but erroneously treated as a
1855 successful delivery. Such timeouts include transport filter timeouts. For
1856 consistency with the overall process timeout, these timeouts are now
1857 treated as errors, giving rise to delivery failures by default. However,
1858 there is now a new Boolean option for the pipe transport called
1859 timeout_defer, which, if set TRUE, converts the failures into defers for
1860 both kinds of timeout. A transport filter timeout is now identified in
1861 the log output.
1862
9176e9f0
PH
1863PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
1864 systems where "make" and "gmake" are different, calling "gmake" at top
1865 level broke things. I've arranged for the value of $(MAKE) to be passed
1866 from the Makefile to this script so that it can call the same version of
1867 "make".
1868
7982096b 1869
bbe902f0
PH
1870A note about Exim versions 4.44 and 4.50
1871----------------------------------------
1872
1873Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
1874changes of various kinds. As a consequence, a big documentation update was
1875needed. This delayed the release for rather longer than seemed good, especially
1876in the light of a couple of (minor) security issues. Therefore, the changes
1877that fixed bugs were backported into 4.43, to create a 4.44 maintenance
1878release. So 4.44 and 4.50 are in effect two different branches that both start
1879from 4.43.
1880
1881I have left the 4.50 change log unchanged; it contains all the changes since
18824.43. The change log for 4.44 is below; many of its items are identical to
1883those for 4.50. This seems to be the most sensible way to preserve the
1884historical information.
1885
1886
f7b63901 1887Exim version 4.50
495ae4b0
PH
1888-----------------
1889
5fe762f6
PH
1890 1. Minor wording change to the doc/README.SIEVE file.
1891
139059f6 1892 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
5fe762f6 1893 computation of the current number of files was incorrect.
495ae4b0 1894
7086e875
PH
1895 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
1896 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
1897 place.
1898
35af9f61
PH
1899 4. Give more explanation in the error message when the command for a transport
1900 filter fails to execute.
1901
b668c215
PH
1902 5. There are several places where Exim runs a non-Exim command in a
1903 subprocess. The SIGUSR1 signal should be disabled for these processes. This
1904 was being done only for the command run by the queryprogram router. It is
1905 now done for all such subprocesses. The other cases are: ${run, transport
1906 filters, and the commands run by the lmtp and pipe transports.
1907
a494b1e1
PH
1908 6. Added CONFIGURE_GROUP build-time option.
1909
1910 7. Some older OS have a limit of 256 on the maximum number of file
1911 descriptors. Exim was using setrlimit() to set 1000 as a large value
1912 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
1913 systems. I've change it so that if it can't get 1000, it tries for 256.
35edf2ff 1914
c5fcb476
PH
1915 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
1916 was an oversight, and furthermore, ever since the addition of extra
1917 controls (e.g. 4.43/32), the checks on when to allow different forms of
1918 "control" were broken. There should now be diagnostics for all cases when a
1919 control that does not make sense is encountered.
1920
69358f02
PH
1921 9. Added the /retain_sender option to "control=submission".
1922
5be20824
PH
192310. $recipients is now available in the predata ACL (oversight).
1924
eb2c0248
PH
192511. Tidy the search cache before the fork to do a delivery from a message
1926 received from the command line. Otherwise the child will trigger a lookup
1927 failure and thereby defer the delivery if it tries to use (for example) a
1928 cached ldap connection that the parent has called unbind on.
1929
2a3eea10
PH
193012. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
1931 of $address_data from the recipient verification was clobbered by the
1932 sender verification.
1933
193413. The value of address_data from a sender verification is now available in
1935 $sender_address_data in subsequent conditions in the ACL statement.
1936
23c7ff99
PH
193714. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
1938
4deaf07d
PH
193915. Added a new option "connect=<time>" to callout options, to set a different
1940 connection timeout.
1941
926e1192
PH
194216. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
1943 was its contents. (It was OK if the option was not defined at all.)
1944
650edc6f
PH
194517. A "Completed" log line is now written for messages that are removed from
1946 the spool by the -Mrm option.
1947
2c7db3f5
PH
194818. New variables $sender_verify_failure and $recipient_verify_failure contain
1949 information about exactly what failed.
1950
3d235903
PH
195119. Added -dd to debug only the daemon process.
1952
7c7ad977
PH
195320. Incorporated Michael Haardt's patch to ldap.c for improving the way it
1954 handles timeouts, both on the server side and network timeouts. Renamed the
1955 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
1956
981756db
PH
195721. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
1958 It is now set to "smtps".
1959
d4eb88df
PH
196022. $host_address is now set to the target address during the checking of
1961 ignore_target_hosts.
1962
196323. When checking ignore_target_hosts for an ipliteral router, no host name was
1964 being passed; this would have caused $sender_host_name to have been used if
1965 matching the list had actually called for a host name (not very likely,
1966 since this list is usually IP addresses). A host name is now passed as
1967 "[x.x.x.x]".
1968
7d468ab8
PH
196924. Changed the calls that set up the SIGCHLD handler in the daemon to use the
1970 code that specifies a non-restarting handler (typically sigaction() in
1971 modern systems) in an attempt to fix a rare and obscure crash bug.
1972
197325. Narrowed the window for a race in the daemon that could cause it to ignore
1974 SIGCHLD signals. This is not a major problem, because they are used only to
1975 wake it up if nothing else does.
1976
62c0818f
PH
197726. A malformed maildirsize file could cause Exim to calculate negative values
1978 for the mailbox size or file count. Odd effects could occur as a result.
1979 The maildirsize information is now recalculated if the size or filecount
1980 end up negative.
1981
26034054
PH
198227. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
1983 support for a long time. Removed HAVE_SYS_VFS_H.
1984
af66f652
PH
198528. Installed the latest version of exipick from John Jetmore.
1986
90af77f4
PH
198729. In an address list, if the pattern was not a regular expression, an empty
1988 subject address (from a bounce message) matched only if the pattern was an
1989 empty string. Non-empty patterns were not even tested. This was the wrong
1990 because it is perfectly reasonable to use an empty address as part of a
1991 database query. An empty address is now tested by patterns that are
1992 lookups. However, all the other forms of pattern expect the subject to
1993 contain a local part and a domain, and therefore, for them, an empty
1994 address still always fails if the pattern is not itself empty.
1995
d8ef3577
PH
199630. Exim went into a mad DNS loop when attempting to do a callout where the
1997 host was specified on an smtp transport, and looking it up yielded more
1998 than one IP address.
1999
5cb8cbc6
PH
200031. Re-factored the code for checking spool and log partition space into a
2001 function that finds that data and another that does the check. The former
2002 is then used to implement four new variables: $spool_space, $log_space,
2003 $spool_inodes, and $log_inodes.
2004
14702f5b
PH
200532. The RFC2047 encoding function was originally intended for short strings
2006 such as real names; it was not keeping to the 75-character limit for
2007 encoded words that the RFC imposes. It now respects the limit, and
2008 generates multiple encoded words if necessary. To be on the safe side, I
2009 have increased the buffer size for the ${rfc2047: expansion operator from
2010 1024 to 2048 bytes.
2011
063b1e99
PH
201233. It is now permitted to omit both strings after an "if" condition; if the
2013 condition is true, the result is "true". As before, when the second string
2014 is omitted, a false condition yields an empty string. This makes it less
2015 cumbersome to write custom ACL and router conditions.
2016
652e1b65
PH
201734. Failure to deliver a bounce message always caused it to be frozen, even if
2018 there was an errors_to setting on the router. The errors_to setting is now
2019 respected.
2020
6f0c9a4f
PH
202135. If an IPv6 address is given for -bh or -bhc, it is now converted to the
2022 canonical form (fully expanded) before being placed in
2023 $sender_host_address.
2024
33397d19
PH
202536. The table in the code that translates DNS record types into text (T_A to
2026 "A" for instance) was missing entries for NS and CNAME. It is just possible
2027 that this could have caused confusion if both these types were looked up
2028 for the same domain, because the text type is used as part of Exim's
2029 per-process caching. But the chance of anyone hitting this buglet seems
2030 very small.
2031
7bb56e1f
PH
203237. The dnsdb lookup has been extended in a number of ways.
2033
2034 (1) There is a new type, "zns", which walks up the domain tree until it
2035 finds some nameserver records. It should be used with care.
2036
ea3bc19b
PH
2037 (2) There is a new type, "mxh", which is like "mx" except that it returns
2038 just the host names, not the priorities.
2039
2040 (3) It is now possible to give a list of domains (or IP addresses) to be
ff4dbb19
PH
2041 looked up. The behaviour when one of the lookups defers can be
2042 controlled by a keyword.
7bb56e1f 2043
ea3bc19b 2044 (4) It is now possible to specify the separator character for use when
7bb56e1f 2045 multiple records are returned.
33397d19 2046
0bcb2a0e
PH
204738. The dnslists ACL condition has been extended: it is now possible to supply
2048 a list of IP addresses and/or domains to be looked up in a particular DNS
2049 domain.
2050
2ac0e484
PH
205139. Added log_selector=+queue_time_overall.
2052
4e1fde53
PH
205340. When running the queue in the test harness, wait just a tad after forking a
2054 delivery process, to get repeatability of debugging output.
2055
de365ded
PH
205641. Include certificate and key file names in error message when GnuTLS fails
2057 to set them up, because the GnuTLS error message doesn't include the name
2058 of the failing file when there is a problem reading it.
2059
f05da2e8
PH
206042. Allow both -bf and -bF in the same test run.
2061
d6453af2
PH
206243. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
2063
f7b63901
PH
206444. The "Exiscan patch" is now merged into the mainline Exim source.
2065
206645. Sometimes the final signoff response after QUIT could fail to get
2067 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
2068 < 0 before doing a fflush(). This bug looks as though it goes back to the
2069 introduction of TLS in release 3.20, but "sometimes" must have been rare
2070 because the tests only now provoked it.
2071
a444213a
PH
207246. Reset the locale to "C" after calling embedded Perl, in case it was changed
2073 (this can affect the format of dates).
2074
0ec020ea
PH
207547. exim_tidydb, when checking for the continued existence of a message for
2076 which it has found a message-specific retry record, was not finding
2077 messages that were in split spool directories. Consequently, it was
2078 deleting retry records that should have stayed in existence.
2079
b1206957
PH
208048. Steve fixed some bugs in eximstats.
2081
208249. The SPA authentication driver was not abandoning authentication and moving
2083 on to the next authenticator when an expansion was forced to fail,
2084 contradicting the general specification for all authenticators. Instead it
2085 was generating a temporary error. It now behaves as specified.
2086
26dd5a95
PH
208750. The default ordering of permitted cipher suites for GnuTLS was pessimal
2088 (the order specifies the preference for clients). The order is now AES256,
2089 AES128, 3DES, ARCFOUR128.
2090
343b2385
PH
209151. Small patch to Sieve code - explicitly set From: when generating an
2092 autoreply.
2093
1c5466b9
PH
209452. Exim crashed if a remote delivery caused a very long error message to be
2095 recorded - for instance if somebody sent an entire SpamAssassin report back
2096 as a large number of 550 error lines. This bug was coincidentally fixed by
2097 increasing the size of one of Exim's internal buffers (big_buffer) that
2098 happened as part of the Exiscan merge. However, to be on the safe side, I
2099 have made the code more robust (and fixed the comments that describe what
2100 is going on).
2101
55ee9ee3
PH
210253. Now that there can be additional text after "Completed" in log lines (if
2103 the queue_time_overall log selector is set), a one-byte patch to exigrep
2104 was needed to allow it to recognize "Completed" as not the last thing in
2105 the line.
2106
d38f8232
PH
210754. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
2108 patch that reportedly fixes this has been added. I am not expert enough to
2109 create a test for it. This is what the patch creator wrote:
2110
2111 "I found a little strange behaviour of ldap code when working with
2112 Windows 2003 AD Domain, where users was placed in more than one
2113 Organization Units. When I tried to give exim partial DN, the exit code
2114 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
2115 But simultaneously result of request was absolutely normal ldap result,
2116 so I produce this patch..."
2117
3295e65b
PH
2118 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
2119 REFERENCE, so I have modified the code to exclude the patch when that macro
2120 is not defined.
2121
7102e136
PH
212255. Some experimental protocols are using DNS PTR records for new purposes. The
2123 keys for these records are domain names, not reversed IP addresses. The
b975ba52
PH
2124 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
2125 leaves it alone. Component reversal etc. now happens only for IP addresses.
ea3a6f44 2126 CAN-2005-0021
7102e136 2127
3ca0ba97
PH
212856. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
2129
c2bcbe20
PH
213057. Double the size of the debug message buffer (to 2048) so that more of very
2131 long debug lines gets shown.
2132
18ce445d
PH
213358. The exicyclog utility now does better if the number of log files to keep
2134 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
2135
1f5b4c3d
PH
213659. Two changes related to the smtp_active_hostname option:
2137
2138 (1) $smtp_active_hostname is now available as a variable.
2139 (2) The default for smtp_banner uses $smtp_active_hostname instead
2140 of $primary_hostname.
2141
b975ba52
PH
214260. The host_aton() function is supposed to be passed a string that is known
2143 to be a valid IP address. However, in the case of IPv6 addresses, it was
2144 not checking this. This is a hostage to fortune. Exim now panics and dies
2145 if the condition is not met. A case was found where this could be provoked
85b87bc2
PH
2146 from a dnsdb PTR lookup with an IPv6 address that had more than 8
2147 components; fortuitously, this particular loophole had already been fixed
2148 by change 4.50/55 above.
2149
2150 If there are any other similar loopholes, the new check in host_aton()
2151 itself should stop them being exploited. The report I received stated that
2152 data on the command line could provoke the exploit when Exim was running as
2153 exim, but did not say which command line option was involved. All I could
2154 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
2155 running as the user.
ea3a6f44 2156 CAN-2005-0021
85b87bc2
PH
2157
215861. There was a buffer overflow vulnerability in the SPA authentication code
2159 (which came originally from the Samba project). I have added a test to the
2160 spa_base64_to_bits() function which I hope fixes it.
ea3a6f44 2161 CAN-2005-0022
b975ba52 2162
17ffcae7
PH
216362. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
2164 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
2165
d95f9fdb
PH
216663. The daemon start-up calls getloadavg() while still root for those OS that
2167 need the first call to be done as root, but it missed one case: when
2168 deliver_queue_load_max is set with deliver_drop_privilege. This is
2169 necessary for the benefit of the queue runner, because there is no re-exec
2170 when deliver_drop_privilege is set.
2171
86b8287f
PH
217264. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
2173 This has been fixed.
2174
60dc5e56
PH
217565. Caching of lookup data for "hosts =" ACL conditions, when a named host list
2176 was in use, was not putting the data itself into the right store pool;
2177 consequently, it could be overwritten for a subsequent message in the same
2178 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
2179 the caching.)
2180
533244af
PH
218166. Added hosts_max_try_hardlimit to the smtp transport, default 50.
2182
a5a28604
PH
218367. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
2184 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
2185 the function were treating the return as a boolean value, which happened to
2186 work because 0=false and not-0=true, but is not correct code.
2187
7e634d24
PH
218868. The host_aton() function was not handling scoped IPv6 addresses (those
2189 with, for example, "%eth0" on the end) correctly.
2190
3e11c26b
PH
219169. Fixed some compiler warnings in acl.c for the bitmaps specified with
2192 negated items (that is, ~something) in unsigned ints. Some compilers
2193 apparently mutter when there is no cast.
2194
6729cf78
PH
219570. If an address verification called from an ACL failed, and did not produce a
2196 user-specific message (i.e. there was only a "system" message), nothing was
2197 put in $acl_verify_message. In this situation, it now puts the system
2198 message there.
2199
00f00ca5
PH
220071. Change 4.23/11 added synchronization checking at the start of an SMTP
2201 session; change 4.31/43 added the unwanted input to the log line - except
2202 that it did not do this in the start of session case. It now does.
2203
c9bdd01c
PH
220472. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
2205 This is wrong and can cause the other end to generate a synchronization
2206 error if it is another Exim or anything else that does the synchronization
2207 check. A QUIT command is no longer sent after a timeout.
2208
d43194df
PH
220973. $host_lookup_deferred has been added, to make it easier to detect DEFERs
2210 during host lookups.
2211
fe5b5d0b
PH
221274. The defer_ok option of callout verification was not working if it was used
2213 when verifying addresses in header lines, that is, for this case:
2214
2215 verify = header_sender/callout=defer_ok
2216
76a2d7ba
PH
221775. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
2218 those file descriptors could be used for SMTP connections. If anything
2219 wrote to stderr (the example that came up was "warn" in embedded Perl), it
2220 could be sent to the SMTP client, causing chaos. The daemon now opens
2221 stdin, stdout, and stderr to /dev/null when it puts itself into the
2222 background.
2223
222476. Arrange for output from Perl's "warn" command to be written to Exim's main
2225 log by default. The user can override this with suitable Perl magic.
2226
04f7d5b9
PH
222777. The use of log_message on a "discard" ACL verb, which is supposed to add to
2228 the log message when discard triggers, was not working for the DATA ACL or
2229 for the non-SMTP ACL.
2230
bc60667e
PH
223178. Error message wording change in sieve.c.
2232
bb6e88ff
PH
223379. If smtp_accept_max_per_host was set, the number of connections could be
2234 restricted to fewer than expected, because the daemon was trying to set up
2235 a new connection before checking whether the processes handling previous
2236 connections had finished. The check for completed processes is now done
2237 earlier. On busy systems, this bug wouldn't be noticed because something
2238 else would have woken the daemon, and it would have reaped the completed
2239 process earlier.
2240
1e70f85b
PH
224180. If a message was submitted locally by a user whose login name contained one
2242 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
2243 It caused a spool format error. I have fixed the spool reading code. A
2244 related problem was that the "from" clause in the Received: line became
2245 illegal because of the space(s). It is now covered by ${quote_local_part.
2246
224781. Included the latest eximstats from Steve (adds average sizes to HTML Top
2248 tables).
2249
4e01f9d6
PH
225082. Updated OS/Makefile-AIX as per message from Mike Meredith.
2251
1ee1cef2
PH
225283. Patch from Sieve maintainer to fix unterminated string problem in
2253 "vacation" handling.
2254
6e2b4ccc
PH
225584. Some minor changes to the Linux configuration files to help with other
2256 OS variants using glibc.
2257
8e669ac1
PH
225885. One more patch for Sieve to update vacation handling to latest spec.
2259
495ae4b0 2260
bbe902f0
PH
2261----------------------------------------------------
2262See the note above about the 4.44 and 4.50 releases.
2263----------------------------------------------------
2264
2265
2266Exim version 4.44
2267-----------------
2268
2269 1. Change 4.43/35 introduced a bug that caused file counts to be
2270 incorrectly computed when quota_filecount was set in an appendfile
2271 transport
2272
2273 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
2274 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
2275 place.
2276
2277 3. Give more explanation in the error message when the command for a transport
2278 filter fails to execute.
2279
2280 4. There are several places where Exim runs a non-Exim command in a
2281 subprocess. The SIGUSR1 signal should be disabled for these processes. This
2282 was being done only for the command run by the queryprogram router. It is
2283 now done for all such subprocesses. The other cases are: ${run, transport
2284 filters, and the commands run by the lmtp and pipe transports.
2285
2286 5. Some older OS have a limit of 256 on the maximum number of file
2287 descriptors. Exim was using setrlimit() to set 1000 as a large value
2288 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
2289 systems. I've change it so that if it can't get 1000, it tries for 256.
2290
2291 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
2292 was an oversight, and furthermore, ever since the addition of extra
2293 controls (e.g. 4.43/32), the checks on when to allow different forms of
2294 "control" were broken. There should now be diagnostics for all cases when a
2295 control that does not make sense is encountered.
2296
2297 7. $recipients is now available in the predata ACL (oversight).
2298
2299 8. Tidy the search cache before the fork to do a delivery from a message
2300 received from the command line. Otherwise the child will trigger a lookup
2301 failure and thereby defer the delivery if it tries to use (for example) a
2302 cached ldap connection that the parent has called unbind on.
2303
2304 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
2305 of $address_data from the recipient verification was clobbered by the
2306 sender verification.
2307
230810. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
2309 was its contents. (It was OK if the option was not defined at all.)
2310
231111. A "Completed" log line is now written for messages that are removed from
2312 the spool by the -Mrm option.
2313
231412. $host_address is now set to the target address during the checking of
2315 ignore_target_hosts.
2316
231713. When checking ignore_target_hosts for an ipliteral router, no host name was
2318 being passed; this would have caused $sender_host_name to have been used if
2319 matching the list had actually called for a host name (not very likely,
2320 since this list is usually IP addresses). A host name is now passed as
2321 "[x.x.x.x]".
2322
232314. Changed the calls that set up the SIGCHLD handler in the daemon to use the
2324 code that specifies a non-restarting handler (typically sigaction() in
2325 modern systems) in an attempt to fix a rare and obscure crash bug.
2326
232715. Narrowed the window for a race in the daemon that could cause it to ignore
2328 SIGCHLD signals. This is not a major problem, because they are used only to
2329 wake it up if nothing else does.
2330
233116. A malformed maildirsize file could cause Exim to calculate negative values
2332 for the mailbox size or file count. Odd effects could occur as a result.
2333 The maildirsize information is now recalculated if the size or filecount
2334 end up negative.
2335
233617. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
2337 support for a long time. Removed HAVE_SYS_VFS_H.
2338
ea3a6f44 233918. Updated exipick to current release from John Jetmore.
bbe902f0
PH
2340
234119. Allow an empty sender to be matched against a lookup in an address list.
2342 Previously the only cases considered were a regular expression, or an
2343 empty pattern.
2344
234520. Exim went into a mad DNS lookup loop when doing a callout where the
2346 host was specified on the transport, if the DNS lookup yielded more than
2347 one IP address.
2348
ea3a6f44
NM
234921. The RFC2047 encoding function was originally intended for short strings
2350 such as real names; it was not keeping to the 75-character limit for
2351 encoded words that the RFC imposes. It now respects the limit, and
2352 generates multiple encoded words if necessary. To be on the safe side, I
2353 have increased the buffer size for the ${rfc2047: expansion operator from
2354 1024 to 2048 bytes.
bbe902f0 2355
ea3a6f44
NM
235622. Failure to deliver a bounce message always caused it to be frozen, even if
2357 there was an errors_to setting on the router. The errors_to setting is now
2358 respected.
bbe902f0
PH
2359
236023. If an IPv6 address is given for -bh or -bhc, it is now converted to the
2361 canonical form (fully expanded) before being placed in
2362 $sender_host_address.
2363
236424. Updated eximstats to version 1.33
2365
ea3a6f44
NM
236625. Include certificate and key file names in error message when GnuTLS fails
2367 to set them up, because the GnuTLS error message doesn't include the name
2368 of the failing file when there is a problem reading it.
bbe902f0
PH
2369
237026. Expand error message when OpenSSL has problems setting up cert/key files.
ea3a6f44 2371 As per change 25.
bbe902f0 2372
ea3a6f44
NM
237327. Reset the locale to "C" after calling embedded Perl, in case it was changed
2374 (this can affect the format of dates).
bbe902f0 2375
ea3a6f44
NM
237628. exim_tidydb, when checking for the continued existence of a message for
2377 which it has found a message-specific retry record, was not finding
2378 messages that were in split spool directories. Consequently, it was
2379 deleting retry records that should have stayed in existence.
bbe902f0
PH
2380
238129. eximstats updated to version 1.35
2382 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
2383 1.35 - bugfix such that pie charts by volume are generated correctly
2384
ea3a6f44
NM
238530. The SPA authentication driver was not abandoning authentication and moving
2386 on to the next authenticator when an expansion was forced to fail,
2387 contradicting the general specification for all authenticators. Instead it
2388 was generating a temporary error. It now behaves as specified.
bbe902f0 2389
ea3a6f44
NM
239031. The default ordering of permitted cipher suites for GnuTLS was pessimal
2391 (the order specifies the preference for clients). The order is now AES256,
2392 AES128, 3DES, ARCFOUR128.
bbe902f0 2393
ea3a6f44
NM
239431. Small patch to Sieve code - explicitly set From: when generating an
2395 autoreply.
bbe902f0 2396
ea3a6f44
NM
239732. Exim crashed if a remote delivery caused a very long error message to be
2398 recorded - for instance if somebody sent an entire SpamAssassin report back
2399 as a large number of 550 error lines. This bug was coincidentally fixed by
2400 increasing the size of one of Exim's internal buffers (big_buffer) that
2401 happened as part of the Exiscan merge. However, to be on the safe side, I
2402 have made the code more robust (and fixed the comments that describe what
2403 is going on).
bbe902f0 2404
ea3a6f44
NM
240533. Some experimental protocols are using DNS PTR records for new purposes. The
2406 keys for these records are domain names, not reversed IP addresses. The
2407 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
2408 leaves it alone. Component reversal etc. now happens only for IP addresses.
bbe902f0
PH
2409 CAN-2005-0021
2410
ea3a6f44
NM
241134. The host_aton() function is supposed to be passed a string that is known
2412 to be a valid IP address. However, in the case of IPv6 addresses, it was
2413 not checking this. This is a hostage to fortune. Exim now panics and dies
2414 if the condition is not met. A case was found where this could be provoked
2415 from a dnsdb PTR lookup with an IPv6 address that had more than 8
2416 components; fortuitously, this particular loophole had already been fixed
2417 by change 4.50/55 or 4.44/33 above.
2418
2419 If there are any other similar loopholes, the new check in host_aton()
2420 itself should stop them being exploited. The report I received stated that
2421 data on the command line could provoke the exploit when Exim was running as
2422 exim, but did not say which command line option was involved. All I could
2423 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
2424 running as the user.
bbe902f0
PH
2425 CAN-2005-0021
2426
ea3a6f44
NM
242735. There was a buffer overflow vulnerability in the SPA authentication code
2428 (which came originally from the Samba project). I have added a test to the
2429 spa_base64_to_bits() function which I hope fixes it.
bbe902f0
PH
2430 CAN-2005-0022
2431
ea3a6f44
NM
243236. The daemon start-up calls getloadavg() while still root for those OS that
2433 need the first call to be done as root, but it missed one case: when
2434 deliver_queue_load_max is set with deliver_drop_privilege. This is
2435 necessary for the benefit of the queue runner, because there is no re-exec
2436 when deliver_drop_privilege is set.
bbe902f0 2437
ea3a6f44
NM
243837. Caching of lookup data for "hosts =" ACL conditions, when a named host list
2439 was in use, was not putting the data itself into the right store pool;
2440 consequently, it could be overwritten for a subsequent message in the same
2441 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
2442 the caching.)
bbe902f0 2443
ea3a6f44
NM
244438. Sometimes the final signoff response after QUIT could fail to get
2445 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
2446 < 0 before doing a fflush(). This bug looks as though it goes back to the
2447 introduction of TLS in release 3.20, but "sometimes" must have been rare
2448 because the tests only now provoked it.
bbe902f0
PH
2449
2450
495ae4b0
PH
2451Exim version 4.43
2452-----------------
2453
2454 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
2455 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
2456 Now it returns an integer. A number of calls were still expecting a T/F
2457 return. Fortuitously, in all cases, the tests worked in OK situations,
2458 which is the norm. However, things would have gone wrong on any write
2459 failures on the smtp file descriptor. This function is used when sending
2460 messages over SMTP and also when doing verify callouts.
2461
2462 2. When Exim is called to do synchronous delivery of a locally submitted
2463 message (the -odf or -odi options), it no longer closes stderr before doing
2464 the delivery.
2465
2466 3. Implemented the mua_wrapper option.
2467
2468 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
2469
2470 5. Implemented the functions header_remove(), header_testname(),
2471 header_add_at_position(), and receive_remove_recipient(), and exported them
2472 to local_scan().
2473
2474 6. If an ACL "warn" statement specified the addition of headers, Exim already
2475 inserted X-ACL-Warn: at the start if there was no header name. However, it
2476 was not making this test for the second and subsequent header lines if
2477 there were newlines in the string. This meant that an invalid header could
2478 be inserted if Exim was badly configured.
2479
2480 7. Allow an ACL "warn" statement to add header lines at the start or after all
2481 the Received: headers, as well as at the end.
2482
2483 8. Added the rcpt_4xx retry error code.
2484
2485 9. Added postmaster_mailfrom=xxx to callout verification option.
2486
248710. Added mailfrom=xxxx to the callout verification option, for verify=
2488 header_sender only.
2489
249011. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
2491 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
2492
249312. Inserted some casts to stop certain compilers warning when using pointer
2494 differences as field lengths or precisions in printf-type calls (mostly
2495 affecting debugging statements).
2496
249713. Added optional readline() support for -be (dynamically loaded).
2498
249914. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
2500 same clock tick as a message's arrival, so that its received time was the
2501 same as the "first fail" time on the retry record, and that message
2502 remained on the queue past the ultimate address timeout, every queue runner
2503 would try a delivery (because it was past the ultimate address timeout) but
2504 after another failure, the ultimate address timeout, which should have then
2505 bounced the address, did not kick in. This was a "< instead of <=" error;
2506 in most cases the first failure would have been in the next clock tick
2507 after the received time, and all would be well.
2508
250915. The special items beginning with @ in domain lists (e.g. @mx_any) were not
2510 being recognized when the domain list was tested by the match_domain
2511 condition in an expansion string.
2512
251316. Added the ${str2b64: operator.
2514
251517. Exim was always calling setrlimit() to set a large limit for the number of
2516 processes, without checking whether the existing limit was already
2517 adequate. (It did check for the limit on file descriptors.) Furthermore,
2518 errors from getrlimit() and setrlimit() were being ignored. Now they are
2519 logged to the main and panic logs, but Exim does carry on, to try to do its
2520 job under whatever limits there are.
2521
252218. Imported PCRE 5.0.
2523
252419. Trivial typo in log message " temporarily refused connection" (the leading
2525 space).
2526
252720. If the log selector return_path_on_delivery was set and an address was
2528 redirected to /dev/null, the delivery process crashed because it assumed
2529 that a return path would always be set for a "successful" delivery. In this
2530 case, the whole delivery is bypassed as an optimization, and therefore no
2531 return path is set.
2532
253321. Internal re-arrangement: the function for sending a challenge and reading
2534 a response while authentication was assuming a zero-terminated challenge
2535 string. It's now changed to take a pointer and a length, to allow for
2536 binary data in such strings.
2537
253822. Added the cyrus_sasl authenticator (code supplied by MBM).
2539
254023. Exim was not respecting finduser_retries when seeking the login of the
2541 uid under which it was called; it was always trying 10 times. (The default
2542 setting of finduser_retries is zero.) Also, it was sleeping after the final
2543 failure, which is pointless.
2544
254524. Implemented tls_on_connect_ports.
2546
254725. Implemented acl_smtp_predata.
2548
254926. If the domain in control=submission is set empty, Exim assumes that the
2550 authenticated id is a complete email address when it generates From: or
2551 Sender: header lines.
2552
255327. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
2554 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
2555 chown and chgrp in /bin and hostname in /usr/bin.
2556
255728. Exim was keeping the "process log" file open after each use, just as it
2558 does for the main log. This opens the possibility of it remaining open for
2559 long periods when the USR1 signal hits a daemon. Occasional processlog
2560 errors were reported, that could have been caused by this. Anyway, it seems
2561 much more sensible not to leave this file open at all, so that is what now
2562 happens.
2563
256429. The long-running daemon process does not normally write to the log once it
2565 has entered its main loop, and it closes the log before doing so. This is
2566 so that log files can straightforwardly be renamed and moved. However,
2567 there are a couple of unusual error situations where the daemon does write
2568 log entries, and I had neglected to close the log afterwards.
2569
257030. The text of an SMTP error response that was received during a remote
2571 delivery was being truncated at 512 bytes. This is too short for some of
2572 the long messages that one sometimes sees. I've increased the limit to
2573 1024.
2574
257531. It is now possible to make retry rules that apply only when a message has a
2576 specific sender, in particular, an empty sender.
2577
257832. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
2579 it possible to be selective about when SMTP synchronization is enforced.
2580
258133. Added "control = caseful_local_part" and "control = "caselower_local_part".
2582
258332. Implemented hosts_connection_nolog.
2584
258533. Added an ACL for QUIT.
2586
258734. Setting "delay_warning=" to disable warnings was not working; it gave a
2588 syntax error.
2589
259035. Added mailbox_size and mailbox_filecount to appendfile.
2591
259236. Added control = no_multiline_responses to ACLs.
2593
259437. There was a bug in the logic of the code that waits for the clock to tick
2595 in the case where the clock went backwards by a substantial amount such
2596 that the microsecond fraction of "now" was more than the microsecond
2597 fraction of "then" (but the whole seconds number was less).
2598
259938. Added support for the libradius Radius client library this is found on
2600 FreeBSD (previously only the radiusclient library was supported).
2601
2602
2603Exim version 4.42
2604-----------------
2605
2606 1. When certain lookups returned multiple values in the form name=value, the
2607 quoting of the values was not always being done properly. Specifically:
2608 (a) If the value started with a double quote, but contained no whitespace,
2609 it was not quoted.
2610 (b) If the value contained whitespace other than a space character (i.e.
2611 tabs or newlines or carriage returns) it was not quoted.
2612 This fix has been applied to the mysql and pgsql lookups by writing a
2613 separate quoting function and calling it from the lookup code. The fix
2614 should probably also be applied to nisplus, ibase and oracle lookups, but
2615 since I cannot test any of those, I have not disturbed their existing code.
2616
2617 2. A hit in the callout cache for a specific address caused a log line with no
2618 reason for rejecting RCPT. Now it says "Previous (cached) callout
2619 verification failure".
2620
2621 3. There was an off-by-one bug in the queryprogram router. An over-long
2622 return line was truncated at 256 instead of 255 characters, thereby
2623 overflowing its buffer with the terminating zero. As well as fixing this, I
2624 have increased the buffer size to 1024 (and made a note to document this).
2625
2626 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
2627 when Exim is waiting for an SMTP response from a remote server, Exim
2628 restarts its select() call on the socket, thereby resetting its timeout.
2629 This is not a problem when such interrupts are rare. Somebody set up a cron
2630 job to run exiwhat every 2 minutes, which is less than the normal select()
2631 timeout (5 or 10 minutes). This meant that the select() timeout never
2632 kicked in because it was always reset. I have fixed this by comparing the
2633 time when an interrupt arrives with the time at the start of the first call
2634 to select(). If more time than the timeout has elapsed, the interrupt is
2635 treated as a timeout.
2636
2637 5. Some internal re-factoring in preparation for the addition of Sieve
2638 extensions (by MH). In particular, the "personal" test is moved to a
2639 separate function, and given an option for scanning Cc: and Bcc: (which is
2640 not set for Exim filters).
2641
2642 6. When Exim created an email address using the login of the caller as the
2643 local part (e.g. when creating a From: or Sender: header line), it was not
2644 quoting the local part when it contained special characters such as @.
2645
2646 7. Installed new OpenBSD configuration files.
2647
2648 8. Reworded some messages for syntax errors in "and" and "or" conditions to
2649 try to make them clearer.
2650
2651 9. Callout options, other than the timeout value, were being ignored when
2652 verifying sender addresses in header lines. For example, when using
2653
2654 verify = header_sender/callout=no_cache
2655
2656 the cache was (incorrectly) being used.
2657
265810. Added a missing instance of ${EXE} to the exim_install script; this affects
2659 only the Cygwin environment.
2660
266111. When return_path_on_delivery was set as a log selector, if different remote
2662 addresses in the same message used different return paths and parallel
2663 remote delivery occurred, the wrong values would sometimes be logged.
2664 (Whenever a remote delivery process finished, the return path value from
2665 the most recently started remote delivery process was logged.)
2666
266712. RFC 3848 specifies standard names for the "with" phrase in Received: header
2668 lines when AUTH and/or TLS are in use. This is the "received protocol"
2669 field. Exim used to use "asmtp" for authenticated SMTP, without any
2670 indication (in the protocol name) for TLS use. Now it follows the RFC and
2671 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
2672 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
2673 names appear in log lines as well as in Received: header lines.
2674
267513. Installed MH's patches for Sieve to add the "copy" and "vacation"
2676 extensions, and comparison tests, and to fix some bugs.
2677
267814. Changes to the "personal" filter test:
2679
2680 (1) The test was buggy in that it was just doing the equivalent of
2681 "contains" tests on header lines. For example, if a user's address was
2682 anne@some.where, the "personal" test would incorrectly be true for
2683
2684 To: susanne@some.where
2685
2686 This test is now done by extracting each address from the header in turn,
2687 and checking the entire address. Other tests that are part of "personal"
2688 are now done using regular expressions (for example, to check local parts
2689 of addresses in From: header lines).
2690
2691 (2) The list of non-personal local parts in From: addresses has been
2692 extended to include "listserv", "majordomo", "*-request", and "owner-*",
2693 taken from the Sieve specification recommendations.
2694
2695 (3) If the message contains any header line starting with "List-" it is
2696 treated as non-personal.
2697
2698 (4) The test for "circular" in the Subject: header line has been removed
2699 because it now seems ill-conceived.
2700
270115. Minor typos in src/EDITME comments corrected.
2702
270316. Installed latest exipick from John Jetmore.
2704
270517. If headers_add on a router specified a text string that was too long for
2706 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
2707 of string_sprintf() is now avoided.
2708
270918. $message_body_size was not set (it was always zero) when running the DATA
2710 ACL and the local_scan() function.
2711
271219. For the "mail" command in an Exim filter, no default was being set for
2713 the once_repeat time, causing a random time value to be used if "once" was
2714 specified. (If the value happened to be <= 0, no repeat happened.) The
2715 default is now 0s, meaning "never repeat". The "vacation" command was OK
2716 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
2717 (I found it when inspecting the code).
2718
271920. There is now an overall timeout for performing a callout verification. It
2720 defaults to 4 times the callout timeout, which applies to individual SMTP
2721 commands during the callout. The overall timeout applies when there is more
2722 than one host that can be tried. The timeout is checked before trying the
2723 next host. This prevents very long delays if there are a large number of
2724 hosts and all are timing out (e.g. when the network connections are timing
2725 out). The value of the overall timeout can be changed by specifying an
2726 additional sub-option for "callout", called "maxwait". For example:
2727
2728 verify = sender/callout=5s,maxwait=20s
2729
273021. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
2731 to the end before writing, but this should make it even safer).
2732
273322. Exim was forgetting that it had advertised PIPELINING for the second and
2734 subsequent messages on an SMTP connection. It was also not resetting its
2735 memory on STARTTLS and an internal HELO.
2736
273723. When Exim logs an SMTP synchronization error within a session, it now
2738 records whether PIPELINING has been advertised or not.
2739
274024. Added 3 instances of "(long int)" casts to time_t variables that were being
2741 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
2742 rather than long int.
2743
274425. Installed the latest Cygwin configuration files from the Cygwin maintainer.
2745
274626. Added the never_mail option to autoreply.
2747
2748
2749Exim version 4.41
2750-----------------
2751
2752 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
2753 crash if the getsockname() call failed; this can happen if a connection is
2754 closed very soon after it is established. The problem was simply in the
2755 order in which certain operations were done, causing Exim to try to write
2756 to the SMTP stream before it had set up the file descriptor. The bug has
2757 been fixed by making things happen in the correct order.
2758
2759
2760Exim version 4.40
2761-----------------
2762
2763 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
2764 before the connection was closed, thus losing the rejection response.
2765
2766 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
2767 some early Solaris releases, but causes trouble in current releases where
2768 socklen_t is defined.
2769
2770 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
2771 always exist.
2772
2773 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
2774 configured.
2775
2776 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
2777 that releasing the top of it at the end releases what was used for sub-
2778 expansions (unless the block got too big). However, discard this block if
2779 the first thing is a variable or header, so that we can use its block when
2780 it is dynamic (useful for very large $message_headers, for example).
2781
2782 6. Lookups now cache *every* query, not just the most recent. A new, separate
2783 store pool is used for this. It can be recovered when all lookup caches are
2784 flushed. Lookups now release memory at the end of their result strings.
2785 This has involved some general refactoring of the lookup sources.
2786
2787 7. Some code has been added to the store_xxx() functions to reduce the amount
2788 of flapping under certain conditions.
2789
2790 8. log_incoming_interface used to affect only the <= reception log lines. Now
2791 it causes the local interface and port to be added to several more SMTP log
2792 lines, for example "SMTP connection from", and rejection lines.
2793
2794 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
2795
279610. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
2797
279811. If $host_data was set by virtue of a hosts lookup in an ACL, its value
2799 could be overwritten at the end of the current message (or the start of a
2800 new message if it was set in a HELO ACL). The value is now preserved for
2801 the duration of the SMTP connection.
2802
280312. If a transport had a headers_rewrite setting, and a matching header line
2804 contained an unqualified address, that address was qualified, even if it
2805 did not match any rewriting rules. The underlying bug was that the values
2806 of the flags that permit the existence of unqualified sender and recipient
2807 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
2808 non-local messages, and by -bnq for local messages) were not being
2809 preserved with the message after it was received.
2810
281113. When Exim was logging an SMTP synchronization error, it could sometimes log
2812 "next input=" as part of the text comprising the host identity instead of
2813 the correct text. The code was using the same buffer for two different
2814 strings. However, depending on which order the printing function evaluated
2815 its arguments, the bug did not always show up. Under Linux, for example, my
2816 test suite worked just fine.
2817
281814. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
2819 doesn't work with some older versions of Perl. It has been changed to "my",
2820 which in any case is probably the better facility to use.
2821
282215. A really picky compiler found some instances of statements for creating
2823 error messages that either had too many or two few arguments for the format
2824 string.
2825
282616. The size of the buffer for calls to the DNS resolver has been increased
2827 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
2828 for addresses that have a lot of PTR records. This alleviates a problem; it
2829 does not fully solve it.
2830
283117. A dnsdb lookup for PTR records that receives more data than will fit in the
2832 buffer now truncates the list and logs the incident, which is the same
2833 action as happens when Exim is looking up a host name and its aliases.
2834 Previously in this situation something unpredictable would happen;
2835 sometimes it was "internal error: store_reset failed".
2836
283718. If a server dropped the connection unexpectedly when an Exim client was
2838 using GnuTLS and trying to read a response, the client delivery process
2839 crashed while trying to generate an error log message.
2840
284119. If a "warn" verb in an ACL added multiple headers to a message in a single
2842 string, for example:
2843
2844 warn message = H1: something\nH2: something
2845
2846 the text was added as a single header line from Exim's point of view
2847 though it ended up OK in the delivered message. However, searching for the
2848 second and subsequent header lines using $h_h2: did not work. This has been
2849 fixed. Similarly, if a system filter added multiple headers in this way,
2850 the routers could not see them.
2851
285220. Expanded the error message when iplsearch is called with an invalid key to
2853 suggest using net-iplsearch in a host list.
2854
285521. When running tests using -bh, any delays imposed by "delay" modifiers in
2856 ACLs are no longer actually imposed (and a message to that effect is
2857 output).
2858
285922. If a "gecos" field in a passwd entry contained escaped characters, in
2860 particular, if it contained a \" sequence, Exim got it wrong when building
2861 a From: or a Sender: header from that name. A second bug also caused
2862 incorrect handling when an unquoted " was present following a character
2863 that needed quoting.
2864
286523. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
2866 was not being matched caselessly.
2867
286824. Arranged for all hyphens in the exim.8 source to be escaped with
2869 backslashes.
2870
287125. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
2872 properly. Recipient callout cache records were still being keyed to include
2873 the sender, even when use_sender was set false. This led to far more
2874 callouts that were necessary. The sender is no longer included in the key
2875 when use_sender is false.
2876
287726. Added "control = submission" modifier to ACLs.
2878
287927. Added the ${base62d: operator to decode base 62 numbers.
2880
288128. dnsdb lookups can now access SRV records.
2882
288329. CONFIGURE_OWNER can be set at build time to define an alternative owner for
2884 the configuration file.
2885
288630. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
2887 (-v) mode. This makes the output for a verbose queue run more intelligible.
2888
288931. Added a use_postmaster feature to recipient callouts.
2890
289132. Added the $body_zerocount variable, containing the number of binary zero
2892 bytes in the message body.
2893
289433. The time of last modification of the "new" subdirectory is now used as the
2895 "mailbox time last read" when there is a quota error for a maildir
2896 delivery.
2897
289834. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
2899
290035. Added +ignore_unknown as a special item in host lists.
2901
290236. Code for decoding IPv6 addresses in host lists is now included, even if
2903 IPv6 support is not being compiled. This fixes a bug in which an IPv6
2904 address was recognized as an IP address, but was then not correctly decoded
2905 into binary, causing unexpected and incorrect effects when compared with
2906 another IP address.
2907
2908
2909Exim version 4.34
2910-----------------
2911
2912 1. Very minor rewording of debugging text in manualroute to say "list of
2913 hosts" instead of "hostlist".
2914
2915 2. If verify=header_syntax was set, and a header line with an unqualified
2916 address (no domain) and a large number of spaces between the end of the
2917 name and the colon was received, the reception process suffered a buffer
2918 overflow, and (when I tested it) crashed. This was caused by some obsolete
2919 code that should have been removed. The fix is to remove it!
2920
2921 3. When running in the test harness, delay a bit after writing a bounce
2922 message to get a bit more predictability in the log output.
2923
2924 4. Added a call to search_tidyup() just before forking a reception process. In
2925 theory, someone could use a lookup in the expansion of smtp_accept_max_
2926 per_host which, without the tidyup, could leave open a database connection.
2927
2928 5. Added the variables $recipient_data and $sender_data which get set from a
2929 lookup success in an ACL "recipients" or "senders" condition, or a router
2930 "senders" option, similar to $domain_data and $local_part_data.
2931
2932 6. Moved the writing of debug_print from before to after the "senders" test
2933 for routers.
2934
2935 7. Change 4.31/66 (moving the time when the Received: is generated) caused
2936 problems for message scanning, either using a data ACL, or using
2937 local_scan() because the Received: header was not generated till after they
2938 were called (in order to set the time as the time of reception completion).
2939 I have revised the way this works. The header is now generated after the
2940 body is received, but before the ACL or local_scan() are called. After they
2941 are run, the timestamp in the header is updated.
2942
2943
2944Exim version 4.33
2945-----------------
2946
2947 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
2948 before starting a queue runner without re-exec. This happened only when
2949 deliver_drop_privilege was set or when the Exim user was set to root. The
2950 effect of the bug was that timeouts during subsequent deliveries caused
2951 crashes instead of being properly handled. The handler is now left at its
2952 default (and expected) setting.
2953
2954 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
2955 message, again when deliver_drop_privilege is set or Exim is run as root.
2956 The bug described in (1) was not present in this case, but the tidying up
2957 of the other signals was missing. I have made the two cases consistent.
2958
2959 3. The ignore_target_hosts setting on a manualroute router was being ignored
2960 for hosts that were looked up using the /MX notation.
2961
2962 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
2963 in domain lists.
2964
2965 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
2966 operated on the sender address. After changing the $sender_address to <>
2967 for the sender address verify, Exim was re-instated it as the original
2968 (before rewriting) address, but remembering that it had rewritten it, so it
2969 wasn't rewriting it again. This bug also had the effect of breaking the
2970 sender address verification caching when the sender address was rewritten.
2971
2972 6. The ignore_target_hosts option was being ignored by the ipliteral router.
2973 This has been changed so that if the ip literal address matches
2974 ignore_target_hosts, the router declines.
2975
2976 7. Added expansion conditions match_domain, match_address, and match_local_
2977 part (NOT match_host).
2978
2979 8. The placeholder for the Received: header didn't have a length field set.
2980
2981 9. Added code to Exim itself and to exim_lock to test for a specific race
2982 condition that could lead to file corruption when using MBX delivery. The
2983 issue is with the lockfile that is created in /tmp. If this file is removed
2984 after a process has opened it but before that process has acquired a lock,
2985 there is the potential for a second process to recreate the file and also
2986 acquire a lock. This could lead to two Exim processes writing to the file
2987 at the same time. The added code performs the same test as UW imapd; it
2988 checks after acquiring the lock that its file descriptor still refers to
2989 the same named file.
2990
299110. The buffer for building added header lines was of fixed size, 8192 bytes.
2992 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
2993 when Exim is built.
2994
299511. Added the smtp_active_hostname option. If used, this will typically be made
2996 to depend on the incoming interface address. Because $interface_address is
2997 not set up until the daemon has forked a reception process, error responses
2998 that can happen earlier (such as "too many connections") no longer contain
2999 a host name.
3000
300112. If an expansion in a condition on a "warn" statement fails because a lookup
3002 defers, the "warn" statement is abandoned, and the next ACL statement is
3003 processed. Previously this caused the whole ACL to be aborted.
3004
300513. Added the iplsearch lookup type.
3006
300714. Added ident_timeout as a log selector.
3008
300915. Added tls_certificate_verified as a log selector.
3010
301116. Added a global option tls_require_ciphers (compare the smtp transport
3012 option of the same name). This controls incoming TLS connections.
3013
301417. I finally figured out how to make tls_require_ciphers do a similar thing
3015 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
3016 before starting the TLS session.
3017
301818. Tabs are now shown as \t in -bP output.
3019
302019. If the log selector return_path_on_delivery was set, Exim crashed when
3021 bouncing a message because it had too many Received: header lines.
3022
302320. If two routers both had headers_remove settings, and the first one included
3024 a superfluous trailing colon, the final name in the first list and the
3025 first name in the second list were incorrectly joined into one item (with a
3026 colon in the middle).
3027
3028
3029Exim version 4.32
3030-----------------
3031
3032 1. Added -C and -D options to the exinext utility, mainly to make it easier
3033 to include in the automated testing, but these could be helpful when
3034 multiple configurations are in use.
3035
3036 2. The exinext utility was not formatting the output nicely when there was
3037 an alternate port involved in the retry record key, nor when there was a
3038 message id as well (for retries that were specific to a specific message
3039 and a specific host). It was also confused by IPv6 addresses, because of
3040 the additional colons they contain. I have fixed the IPv4 problem, and
3041 patched it up to do a reasonable job for IPv6.
3042
3043 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
3044 delivery, the log line now contains "pipelined" if PIPELINING was used.
3045
3046 4. An SMTP transport process used to panic and die if the bind() call to set
3047 an explicit outgoing interface failed. This has been changed; it is now
3048 treated in the same way as a connect() failure.
3049
3050 5. A reference to $sender_host_name in the part of a conditional expansion
3051 that was being skipped was still causing a DNS lookup. This no longer
3052 occurs.
3053
3054 6. The def: expansion condition was not recognizing references to header lines
3055 that used bh_ and bheader_.
3056
3057 7. Added the _cache feature to named lists.
3058
3059 8. The code for checking quota_filecount in the appendfile transport was
3060 allowing one more file than it should have been.
3061
3062 9. For compatibility with Sendmail, the command line option
3063
3064 -prval:sval
3065
3066 is equivalent to
3067
3068 -oMr rval -oMs sval
3069
3070 and sets the incoming protocol and host name (for trusted callers). The
3071 host name and its colon can be omitted when only the protocol is to be set.
3072 Note the Exim already has two private options, -pd and -ps, that refer to
3073 embedded Perl. It is therefore impossible to set a protocol value of "d" or
3074 "s", but I don't think that's a major issue.
3075
307610. A number of refactoring changes to the code, none of which should affect
3077 Exim's behaviour:
3078
3079 (a) The number of logging options was getting close to filling up the
3080 32-bit word that was used as a bit map. I have split them into two classes:
3081 those that are passed in the argument to log_write(), and those that are
3082 only ever tested independently outside of that function. These are now in
3083 separate 32-bit words, so there is plenty of room for expansion again.
3084 There is no change in the user interface or the logging behaviour.
3085
3086 (b) When building, for example, log lines, the code previously used a
3087 macro that called string_cat() twice, in order to add two strings. This is
3088 not really sufficiently general. Furthermore, there was one instance where
3089 it was actually wrong because one of the argument was used twice, and in
3090 one call a function was used. (As it happened, calling the function twice
3091 did not affect the overall behaviour.) The macro has been replaced by a
3092 function that can join an arbitrary number of extra strings onto a growing
3093 string.
3094
3095 (c) The code for expansion conditions now uses a table and a binary chop
3096 instead of a serial search (which was left over from when there were very
3097 few conditions). Also, it now recognizes conditions like "pam" even when
3098 the relevant support is not compiled in: a suitably worded error message is
3099 given if an attempt is made to use such a condition.
3100
310111. Added ${time_interval:xxxxx}.
3102
310312. A bug was causing one of the ddress fields not to be passed back correctly
3104 from remote delivery subprocesses. The field in question was not being
3105 subsequently used, so this caused to problems in practice.
3106
310713. Added new log selectors queue_time and deliver_time.
3108
310914. Might have fixed a bug in maildirsizefile handling that threw up
3110 "unexpected character" debug warnings, and recalculated the data
3111 unnecessarily. In any case, I expanded the warning message to give more
3112 information.
3113
311415. Added the message "Restricted characters in address" to the statements in
3115 the default ACL that block characters like @ and % in local parts.
3116
311716. Change 71 for release 4.31 proved to be much less benign that I imagined.
3118 Three changes have been made:
3119
3120 (a) There was a serious bug; a negative response to MAIL caused the whole
3121 recipient domain to be cached as invalid, thereby blocking all messages
3122 to all local parts at the same domain, from all senders. This bug has
3123 been fixed. The domain is no longer cached after a negative response to
3124 MAIL if the sender used is not empty.
3125
3126 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
3127 been restored.
3128
3129 (c) A new callout option, "use_sender" has been added for people who want
3130 the modified behaviour.
3131
3132
3133Exim version 4.31
3134-----------------
3135
3136 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
3137 Larry Rosenman.
3138
3139 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
3140 indeed breaks things for older releases.
3141
3142 3. Added additional logging to the case where there is a problem reading data
3143 from a filter that is running in a subprocess using a pipe, in order to
3144 try to track down a specific problem.
3145
3146 4. Testing facility fudge: when running in the test harness and attempting
3147 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
3148 getting "No route to host". Convert this to a timeout.
3149
3150 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
3151 warning.
3152
3153 6. Some OS don't have socklen_t but use size_t instead. This affects the
3154 fifth argument of getsockopt() amongst other things. This is now
3155 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
3156 can be set for individual OS. I have set it for SunOS5, OSF1, and
3157 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
3158 some earlier ones do not.
3159
3160 7. Change 4.30/15 was not doing the test caselessly.
3161
3162 8. The standard form for an IPv6 address literal was being rejected by address
3163 parsing in, for example, MAIL and RCPT commands. An example of this kind of
3164 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
3165 this, as well as the form without the "IPv6" on the front (but only when
3166 address literals are enabled, of course).
3167
3168 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
3169
317010. Exim crashed if a message with an empty sender address specified by -f
3171 encountered a router with an errors_to setting. This could be provoked only
3172 by a command such as
3173
3174 exim -f "" ...
3175
3176 where an empty string was supplied; "<>" did not hit this bug.
3177
317811. Installed PCRE release 4.5.
3179
318012. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
3181 remained set. It is now erased.
3182
318313. exiqgrep wasn't working on MacOS X because it didn't correctly compute
3184 times from message ids (which are base 36 rather than the normal 62).
3185
318614. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
3187 were being counted as actual protocol errors, and logged if the log
3188 selector +smtp_protocol_error was set. One cannot be perfect in this test,
3189 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
3190 and DATA following a set of rejected RCPTs do not count as protocol errors.
3191 In other words, Exim assumes they were pipelined, though this may not
3192 actually be the case. Of course, in all cases the client gets an
3193 appropriate error code.
3194
319515. If a lookup fails in an ACL condition, a message about the failure may
3196 be available; it is used if testing the ACL cannot continue, because most
3197 such messages specify what the cause of the deferral is. However, some
3198 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
3199 that caused an old message to be retained and used if a later statement
3200 caused a defer, replacing the real cause of the deferral.
3201
320216. If an IP address had so many PTR records that the DNS lookup buffer
3203 was not large enough to hold them, Exim could crash while trying to process
3204 the truncated data. It now detects and logs this case.
3205
320617. Further to 4.21/58, another change has been made: if (and only if) the
3207 first line of a message (the first header line) ends with CRLF, a bare LF
3208 in a subsequent header line has a space inserted after it, so as not to
3209 terminate the header.
3210
321118. Refactoring: tidied an ugly bit of code in appendfile that copied data
3212 unnecessarily, used atoi() instead of strtol(), and didn't check the
3213 termination when getting file sizes from file names by regex.
3214
321519. Completely re-implemented the support for maildirsize files, in the light
3216 of a number of problems with the previous contributed implementation
3217 (4.30/29). In particular:
3218
3219 . If the quota is zero, the maildirsize file is maintained, but no quota is
3220 imposed.
3221
3222 . If the maildir directory does not exist, it is created before any attempt
3223 to write a maildirsize file.
3224
3225 . The quota value in the file is just a cache; if the quota is changed in
3226 the transport, the new value overrides.
3227
3228 . A regular expression is available for excluding directories from the
3229 count.
3230
323120. The autoreply transport checks the characters in options that define the
3232 message's headers; it allows continued headers, but it was checking with
3233 isspace() after an embedded newline instead of explicitly looking for a
3234 space or a tab.
3235
323621. If all the "regular" hosts to which an address was routed had passed their
3237 expiry times, and had not reached their retry times, the address was
3238 bounced, even if fallback hosts were defined. Now Exim should go on to try
3239 the fallback hosts.
3240
324122. Increased buffer sizes in the callout code from 1024 to 4096 to match the
3242 equivalent code in the SMTP transport. Some hosts send humungous responses
3243 to HELO/EHLO, more than 1024 it seems.
3244
324523. Refactoring: code in filter.c used (void *) for "any old type" but this
3246 gives compiler warnings in some environments. I've now done it "properly",
3247 using a union.
3248
324924. The replacement for inet_ntoa() that is used with gcc on IRIX systems
3250 (because of problems with the built-in one) was declared to return uschar *
3251 instead of char *, causing compiler failure.
3252
325325. Fixed a file descriptor leak when processing alias/forward files.
3254
325526. Fixed a minor format string issue in dbfn.c.
3256
325727. Typo in exim.c: ("dmbnz" for "dbmnz").
3258
325928. If a filter file refered to $h_xxx or $message_headers, and the headers
3260 contained RFC 2047 "words", Exim's memory could, under certain conditions,
3261 become corrupted.
3262
326329. When a sender address is verified, it is cached, to save repeating the test
3264 when there is more than one recipient in a message. However, when the
3265 verification involves a callout, it is possible for different callout
3266 options to be set for different recipients. It is too complicated to keep
3267 track of this in the cache, so now Exim always runs a verification when a
3268 callout is required, relying on the callout cache for the optimization.
3269 The overhead is duplication of the address routing, but this should not be
3270 too great.
3271
327230. Fixed a bug in callout caching. If a RCPT command caused the sender address
3273 to be verified with callout=postmaster, and the main callout worked but the
3274 postmaster check failed, the verification correctly failed. However, if a
3275 subsequent RCPT command asked for sender verification *without* the
3276 postmaster check, incorrect caching caused this verification also to fail,
3277 incorrectly.
3278
327931. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
3280 it was not caching the DNS options (qualify_single, search_parents) that
3281 were used when the lookup failed. A subsequent lookup with different
3282 options therefore always gave the same answer, though there were cases
3283 where it should not have. (Example: a "domains = !$mx_any" option on a
3284 dnslookup router: the "domains" option is always processed without any
3285 widening, but the router might have qualify_single set.) Now Exim uses the
3286 cached value only when the same options are set.
3287
328832. Added John Jetmore's "exipick" utility to the distribution.
3289
329033. GnuTLS: When an attempt to start a TLS session fails for any reason other
3291 than a timeout (e.g. a certificate is required, and is not provided), an
3292 Exim server now closes the connection immediately. Previously it waited for
3293 the client to close - but if the client is SSL, it seems that they each
3294 wait for each other, leading to a delay before one of them times out.
3295
329634: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
3297 maintained 0.8.x compatibility because I don't think many are using it, and
3298 it is clearly obsolete.
3299
330035. Added TLS support for CRLs: a tls_crl global option and one for the smtp
3301 transport.
3302
330336. OpenSSL: $tls_certificate_verified was being set to 1 even if the
3304 client certificate was expired. A simple patch fixes this, though I don't
3305 understand the full logic of why the verify callback is called multiple
3306 times.
3307
330837. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
3309 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
3310 which causes problems with some clients (such as the Certicom SSL Plus
3311 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
3312 disables the coutermeasure allowing Eudora to connect."
3313
331438. Exim was not checking that a write() to a log file succeeded. This could
3315 lead to Bad Things if a log got too big, in particular if it hit a file
3316 size limit. Exim now panics and dies if it cannot write to a log file, just
3317 as it does if it cannot open a log file.
3318
331939. Modified OS/Makefile-Linux so that it now contains
3320
3321 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
3322
3323 The two -D definitions ensure that Exim is compiled with large file
3324 support, which makes it possible to handle log files that are bigger than
3325 2^31.
3326
332740. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
3328 instance) a domain was checked against a named list that involved a lookup,
3329 causing $domain_data to be set, then another domain was checked against the
3330 same list, then the first domain was re-checked, the value of $domain_data
3331 after the final check could be wrong. In particular, if the second check
3332 failed, it could be set empty. This bug probably also applied to
3333 $localpart_data.
3334
333541. The strip_trailing_dot option was not being applied to the address given
3336 with the -f command-line option.
3337
333842. The code for reading a message's header from the spool was incrementing
3339 $received_count, but never initializing it. This meant that the value was
3340 incorrect (doubled) while delivering a message in the same process in which
3341 it was received. In the most common configuration of Exim, this never
3342 happens - a fresh exec is done - but it can happen when
3343 deliver_drop_privilege is set.
3344
334543. When Exim logs an SMTP synchronization error - client data sent too soon -
3346 it now includes up to 150 characters of the unexpected data in the log
3347 line.
3348
334944. The exim_dbmbuild utility uses fixed size buffers for reading input lines
3350 and building data strings. The size of both of these buffers was 10 000
3351 bytes - far larger than anybody would *ever* want, thought I. Needless to
3352 say, somebody hit the limit. I have increased the maximum line length to
3353 20 000 and the maximum data length of concatenated lines to 100 000. I have
3354 also fixed two bugs, because there was no checking on these buffers. Tsk,
3355 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
3356 buffer is too small.
3357
335845. The exim_dbmbuild utility did not support quoted keys, as Exim does in
3359 lsearch lookups. Now it does.
3360
336146. When parsing a route_list item in a manualroute router, a fixed-length
3362 buffer was used for the list of hosts. I made this 1024 bytes long,
3363 thinking that nobody would ever have a list of hosts that long. Wrong.
3364 Somebody had a whole pile of complicated expansion conditions, and the
3365 string was silently truncated, leading to an expansion error. It turns out
3366 that it is easier to change to an unlimited length (owing to other changes
3367 that have happened since this code was originally written) than to build
3368 structure for giving a limitation error. The length of the item that
3369 expands into the list of hosts is now unlimited.
3370
337147. The lsearch lookup could not handle data where the length of text line was
3372 more than 4095 characters. Such lines were truncated, leading to shortened
3373 data being returned. It should now handle lines of any length.
3374
337548. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
3376 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
3377 ACL").
3378
337949. Cosmetic tidy to scripts like exicyclog that are generated by globally
3380 replacing strings such as BIN_DIRECTORY in a source file: the replacement
3381 no longer happens in comment lines. A list of replacements is now placed
3382 at the head of all of the source files, except those whose only change is
3383 to replace PERL_COMMAND in the very first #! line.
3384
338550. Replaced the slow insertion sort in queue.c, for sorting the list of
3386 messages on the queue, with a bottom-up merge sort, using code contributed
3387 by Michael Haardt. This should make operations like -bp somewhat faster on
3388 large queues. It won't affect queue runners, except when queue_run_in_order
3389 is set.
3390
339151. Installed eximstats 1.31 in the distribution.
3392
339352. Added support for SRV lookups to the dnslookup router.
3394
339553. If an ACL referred to $message_body or $message_body_end, the value was not
3396 reset for any messages that followed in the same SMTP session.
3397
339854. The store-handling optimization for building very long strings was not
3399 differentiating between the different store pools. I don't think this
3400 actually made any difference in practice, but I've tidied it.
3401
340255. While running the routers to verify a sender address, $sender_address
3403 was still set to the sender address. This is wrong, because when routing to
3404 send a bounce to the sender, it would be empty. Therefore, I have changed
3405 it so that, while verifying a sender address, $sender_address is set to <>.
3406 (There is no change to what happens when verifying a recipient address.)
3407
340856. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
3409 target A or AAAA records (if not already returned) without resetting the
3410 qualify_single or search_parents options of the DNS resolver. These are
3411 inappropriate in this case because the targets of MX and SRV records must
3412 be FQDNs. A broken DNS record could cause trouble if it happened to have a
3413 target that, when qualified, matched something in the local domain. These
3414 two options are now turned off when doing these lookups.
3415
341657. It seems that at least some releases of Reiserfs (which does not have the
3417 concept of a fixed number of inodes) returns zero and not -1 for the
3418 number of available inodes. This interacted badly with check_spool_inodes,
3419 which assumed that -1 was the "no such thing" setting. What I have done is
3420 to check that the total number of inodes is greater than zero before doing
3421 the test of how many are available.
3422
342358. When a "warn" ACL statement has a log_message modifier, the message is
3424 remembered, and not repeated. This is to avoid a lot of repetition when a
3425 message has many recipients that cause the same warning to be written.
3426 Howewer, Exim was preserving the list of already written lines for an
3427 entire SMTP session, which doesn't seem right. The memory is now reset if a
3428 new message is started.
3429
343059. The "rewrite" debugging flag was not showing the result of rewriting in the
3431 debugging output unless log_rewrite was also set.
3432
343360. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
3434 of (int)(handle) when we know that handle contains (void *)(-1).
3435
343661. The Exim daemon panic-logs an error return when it closes the incoming
3437 connection. However "connection reset by peer" seems to be common, and
3438 isn't really an error worthy of noting specially, so that particular error
3439 is no long logged.
3440
344162. When Exim is trying to find all the local interfaces, it used to panic and
3442 die if the ioctl to get the interface flags failed. However, it seems that
3443 on at least one OS (Solaris 9) it is possible to have an interface that is
3444 included in the list of interfaces, but for which you get a failure error
3445 for this call. This happens when the interface is not "plumbed" into a
3446 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
3447 failure of the "get flags" call assumes that the interface is down.
3448
344963. Added a ${eval10: operator, which assumes all numbers are decimal. This
3450 makes life easier for people who are doing arithmetic on fields extracted
3451 from dates, where you often get leading zeros that should not be
3452 interpreted as octal.
3453
345464. Added qualify_domain to the redirect router, to override the global
3455 setting.
3456
345765. If a pathologically long header line contained very many addresses (the
3458 report of this problem mentioned 10 000) and each of them was rewritten,
3459 Exim could use up a very large amount of memory. (It kept on making new
3460 copies of the header line as it rewrote, and never released the old ones.)
3461 At the expense of a bit more processing, the header rewriting function has
3462 been changed so that it no longer eats memory in this way.
3463
346466. The generation of the Received: header has been moved from the time that a
3465 message starts to be received, to the time that it finishes. The timestamp
3466 in the Received: header should now be very close to that of the <= log
3467 line. There are two side-effects of this change:
3468
3469 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
3470 logged header lines no longer include the local Received: line, because
3471 it has not yet been created. The same applies to a copy of the message
3472 that is returned to a non-SMTP sender when a message is rejected.
3473
3474 (b) When a filter file is tested using -bf, no additional Received: header
3475 is added to the test message. After some thought, I decided that this
3476 is a bug fix.
3477
3478 This change does not affect the value of $received_for. It is still set
3479 after address rewriting, but before local_scan() is called.
3480
348167. Installed the latest Cygwin-specific files from the Cygwin maintainer.
3482
348368. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
3484 gave an unhelpful panic error message, and a defer error. I have managed to
3485 change this behaviour so that it now rejects any supplied certificate,
3486 which seems right, as the list of acceptable certificates is empty.
3487
348869. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
3489 gave an unhelpful defer error. I have not managed to make this reject any
3490 supplied certificates, but the error message it gives is "no certificate
3491 supplied", which is not helpful.
3492
349370. exigrep's output now also includes lines that are not associated with any
3494 message, but which match the given pattern. Implemented by a patch from
3495 Martin Sluka, which also tidied up the Perl a bit.
3496
349771. Recipient callout verification, like sender verification, was using <> in
3498 the MAIL FROM command. This isn't really the right thing, since the actual
3499 sender may affect whether the remote host accepts the recipient or not. I
3500 have changed it to use the actual sender in the callout; this means that
3501 the cache record is now keyed on a recipient/sender pair, not just the
3502 recipient address. There doesn't seem to be a real danger of callout loops,
3503 since a callout by the remote host to check the sender would use <>.
3504 [SEE ABOVE: changed after hitting problems.]
3505
350672. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
3507 temporary errors. However, in the case of such a code being given after
3508 the end of a data transmission (i.e. after ".") Exim was failing to write
3509 a retry record for the message. (Yes, there was some broken host that was
3510 actually sending 8xx at this point.)
3511
351273. An unknown lookup type in a host list could cause Exim to panic-die when
3513 the list was checked. (An example that provoked this was putting <; in the
3514 middle of a list instead of at the start.) If this happened during a DATA
3515 ACL check, a -D file could be left lying around. This kind of configuration
3516 error no longer causes Exim to die; instead it causes a defer errror. The
3517 incident is still logged to the main and panic logs.
3518
351974. Buglet left over from Exim 3 conversion. The message "too many messages
3520 in one connection" was written to the rejectlog but not the mainlog, except
3521 when address rewriting (yes!) was being logged.
3522
352375. Added write_rejectlog option.
3524
352576. When a system filter was run not as root (that is, when system_filter_user
3526 was set), the values of the $n variables were not being returned to the
3527 main process; thus, they were not subsequently available in the $sn
3528 variables.
3529
353077. Added +return_path_on_delivery log selector.
3531
353278. A connection timeout was being treated differently from recipients deferred
3533 when testing hosts_max_try with a message that was older than the host's
3534 retry timeout. (The host should not be counted, thus allowing all hosts to
3535 be tried at least once before bouncing.) This may have been the cause of an
3536 occasionally reported bug whereby a message would remain on the queue
3537 longer than the retry timeout, but would be bounced if a delivery was
3538 forced. I say "may" because I never totally pinned down the problem;
3539 setting up timeout/retry tests is difficult. See also the next item.
3540
354179. The ultimate address timeout was not being applied to errors that involved
3542 a combination of host plus message (for example, a timeout on a MAIL
3543 command). When an address resolved to a number of possible hosts, and they
3544 were not all tried for each delivery (e.g. because of hosts_max_try), a
3545 message could remain on the queue longer than the retry timeout.
3546
354780. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
3548 Haardt.
3549
355081. Fixed an obscure SMTP outgoing bug which required at least the following
3551 conditions: (a) there was another message waiting for the same server;
3552 (b) the server returned 5xx to all RCPT commands in the first message so
3553 that the message was not completed; (c) the server dropped the connection
3554 or gave a negative response to the RSET that Exim sends to abort the
3555 transaction. The observed case was a dropped connection after DATA that had
3556 been sent in pipelining mode. That is, the server had advertised PIPELINING
3557 but was not implementing it correctly. The effect of the bug was incorrect
3558 behaviour, such as trying another host, and this could lead to a crash.
3559
3560
3561Exim version 4.30
3562-----------------
3563
3564 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
3565 and daemon.c were passed as pointers to ints; they should have been
3566 pointers to socklen_t variables (which are typically unsigned ints).
3567
3568 2. Some signed/unsigned type warnings in the os.c file for Linux have been
3569 fixed.
3570
3571 3. Fixed a really odd bug that affected only the testing scheme; patching a
3572 certain fixed string in the binary changed the value of another string that
3573 happened to be identical to the end of the original first string.
3574
3575 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
3576 name", it returns that address as the IP address. On some operating
3577 systems (e.g. Solaris), it also passes back the IP address string as the
3578 "host name". However, on others (e.g. Linux), it passes back an empty
3579 string. Exim wasn't checking for this, and was changing the host name to an
3580 empty string, assuming it had been canonicized.
3581
3582 5. Although rare, it is permitted to have more than one PTR record for a given
3583 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
3584 all the names associated with an address, because they do in Solaris.
3585 However, it seems that they do not in Linux for data that comes from the
3586 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
3587 I found this out when I moved to a new Linux workstation and tried to run
3588 the Exim test suite.
3589
3590 To get round this problem I have changed the code so that it now does its
3591 own call to the DNS to look up PTR records when searching for a host name.
3592 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
3593 addresses that are only in /etc/hosts are still found.
3594
3595 This behaviour is, however, controlled by an option called host_lookup_
3596 order, which defaults to "bydns:byaddr". If people want to use the other
3597 order, or indeed, just use one or the other means of lookup, they can
3598 specify it in this variable.
3599
3600 6. If a PTR record yields an empty name, Exim treats it as non-existent. In