fix non-bw case, late slip not re-run by my earlier tests
[exim.git] / src / README.UPDATING
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1This document contains detailed information about incompatibilities that might
2be encountered when upgrading from one release of Exim to another. The
3information is in reverse order of release numbers. Mostly these are relatively
4small points, and the configuration file is normally upwards compatible, but
5there have been two big upheavals...
6
7
8**************************************************************************
9* There was a big reworking of the way mail routing works for release *
10* 4.00. Previously used "directors" were abolished, and all routing is *
11* now done by routers. Policy controls for incoming mail are now done by *
12* Access Control Lists instead of separate options. All this means that *
13* pre-4.00 configuration files have to be massively converted. If you *
14* are coming from a 3.xx release, please read the document in the file *
15* doc/Exim4.upgrade, and allow some time to complete the upgrade. *
16* *
17* There was a big reworking of the way domain/host/net/address lists are *
18* handled at release 3.00. If you are coming from a pre-3.00 release, it *
19* might be easier to start again from a default configuration. Otherwise *
20* you need to read doc/Exim3.upgrade and do a double conversion of your *
21* configuration file. *
22**************************************************************************
23
24
25The rest of this document contains information about changes in 4.xx releases
26that might affect a running system.
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29Exim version 4.78
30-----------------
31
32 * The value of $tls_peerdn is now print-escaped when written to the spool file
33 in a -tls_peerdn line, and unescaped when read back in. We received reports
34 of values with embedded newlines, which caused spool file corruption.
35
36 If you have a corrupt spool file and you wish to recover the contents after
37 upgrading, then lock the message, replace the new-lines that should be part
38 of the -tls_peerdn line with the two-character sequence \n and then unlock
39 the message. No tool has been provided as we believe this is a rare
40 occurence.
41
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42 * With OpenSSL 1.0.1+, Exim now supports TLS 1.1 and TLS 1.2. If built
43 against 1.0.1a then you will get a warning message and the
44 "openssl_options" value will not parse "no_tlsv1_1": the value changes
45 incompatibly between 1.0.1a and 1.0.1b, because the value chosen for 1.0.1a
46 is infelicitous. We advise avoiding 1.0.1a.
47
48 "openssl_options" gains "no_tlsv1_1", "no_tlsv1_2" and "no_compression".
49
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50 COMPATIBILITY WARNING: The default value of "openssl_options" is no longer
51 "+dont_insert_empty_fragments". We default to unset. That old default was
52 grandfathered in from before openssl_options became a configuration option.
53 Empty fragments are inserted by default through TLS1.0, to partially defend
54 against certain attacks; TLS1.1+ change the protocol so that this is not
55 needed. The DIEF SSL option was required for some old releases of mail
56 clients which did not gracefully handle the empty fragments, and was
57 initially set in Exim release 4.31 (see ChangeLog, item 37).
58
59 If you still have affected mail-clients, and you see SSL protocol failures
60 with this release of Exim, set:
61 openssl_options = +dont_insert_empty_fragments
62 in the main section of your Exim configuration file. You're trading off
63 security for compatibility. Exim is now defaulting to higher security and
64 rewarding more modern clients.
65
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66 * Ldap lookups returning multi-valued attributes now separate the attributes
67 with only a comma, not a comma-space sequence. Also, an actual comma within
68 a returned attribute is doubled. This makes it possible to parse the
69 attribute as a comma-separated list. Note the distinction from multiple
70 attributes being returned, where each one is a name=value pair.
c80c5570 71
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72 * accept_8bitmime now defaults on, which is not RFC compliant but is better
73 suited to today's Internet. See http://cr.yp.to/smtp/8bitmime.html for a
74 sane rationale. Those who wish to be strictly RFC compliant, or know that
75 they need to talk to servers that are not 8-bit-clean, now need to take
76 explicit configuration action to default this option off. This is not a
77 new option, you can safely force it off before upgrading, to decouple
78 configuration changes from the binary upgrade while remaining RFC compliant.
79
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81Exim version 4.77
82-----------------
83
84 * GnuTLS will now attempt to use TLS 1.2 and TLS 1.1 before TLS 1.0 and SSL3,
85 if supported by your GnuTLS library. Use the existing
86 "gnutls_require_protocols" option to downgrade this if that will be a
87 problem. Prior to this release, supported values were "TLS1" and "SSL3",
88 so you should be able to update configuration prior to update.
89
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90 * The match_<type>{string1}{string2} expansion conditions no longer subject
91 string2 to string expansion, unless Exim was built with the new
92 "EXPAND_LISTMATCH_RHS" option. Too many people have inadvertently created
93 insecure configurations that way. If you need the functionality and turn on
94 that build option, please let the developers know, and know why, so we can
95 try to provide a safer mechanism for you.
96
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97 The match{}{} expansion condition (for regular expressions) is NOT affected.
98 For match_<type>{s1}{s2}, all list functionality is unchanged. The only
99 change is that a '$' appearing in s2 will not trigger expansion, but instead
100 will be treated as a literal $ sign; the effect is very similar to having
101 wrapped s2 with \N...\N. If s2 contains a named list and the list definition
102 uses $expansions then those _will_ be processed as normal. It is only the
103 point at which s2 is read where expansion is inhibited.
104
105 If you are trying to test if two email addresses are equal, use eqi{s1}{s2}.
106 If you are testing if the address in s1 occurs in the list of items given
107 in s2, either use the new inlisti{s1}{s2} condition (added in 4.77) or use
108 the pre-existing forany{s2}{eqi{$item}{s1}} condition.
109
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111Exim version 4.74
112-----------------
113
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114 * The integrated support for dynamically loadable lookup modules has an ABI
115 change from the modules supported by some OS vendors through an unofficial
116 patch. Don't try to mix & match.
117
118 * Some parts of the build system are now beginning to assume that the host
119 environment is POSIX. If you're building on a system where POSIX tools are
120 not the default, you might have an easier time if you switch to the POSIX
121 tools. Feel free to report non-POSIX issues as a request for a feature
122 enhancement, but if the POSIX variants are available then the fix will
123 probably just involve some coercion. See the README instructions for
124 building on such hosts.
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125
126
127Exim version 4.73
128-----------------
129
130 * The Exim run-time user can no longer be root; this was always
131 strongly discouraged, but is now prohibited both at build and
132 run-time. If you need Exim to run routinely as root, you'll need to
133 patch the source and accept the risk. Here be dragons.
134
135 * Exim will no longer accept a configuration file owned by the Exim
136 run-time user, unless that account is explicitly the value in
137 CONFIGURE_OWNER, which we discourage. Exim now checks to ensure that
a7ee5955 138 files are not writeable by other accounts.
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139
140 * The ALT_CONFIG_ROOT_ONLY build option is no longer optional and is forced
141 on; the Exim user can, by default, no longer use -C/-D and retain privilege.
142 Two new build options mitigate this.
143
144 * TRUSTED_CONFIG_LIST defines a file containing a whitelist of config
145 files that are trusted to be selected by the Exim user; one per line.
146 This is the recommended approach going forward.
147
148 * WHITELIST_D_MACROS defines a colon-separated list of macro names which
149 the Exim run-time user may safely pass without dropping privileges.
150 Because changes to this involve a recompile, this is not the recommended
151 approach but may ease transition. The values of the macros, when
43236f35 152 overridden, are constrained to match this regex: ^[A-Za-z0-9_/.-]*$
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153
154 * The system_filter_user option now defaults to the Exim run-time user,
155 rather than root. You can still set it explicitly to root and this
156 can be done with prior versions too, letting you roll versions
157 without needing to change this configuration option.
158
159 * ClamAV must be at least version 0.95 unless WITH_OLD_CLAMAV_STREAM is
160 defined at build time.
161
162
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163Exim version 4.70
164-----------------
165
1661. Experimental Yahoo! Domainkeys support has been dropped in this release.
167It has been superceded by a native implementation of its successor DKIM.
168
1692. Up to version 4.69, Exim came with an embedded version of the PCRE library.
170As of 4.70, this is no longer the case. To compile Exim, you will need PCRE
a7ee5955 171installed. Most OS distributions have ready-made library and development
2eda48c6 172packages.
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173
174
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175Exim version 4.68
176-----------------
177
1781. The internal implementation of the database keys that are used for ACL
179ratelimiting has been tidied up. This means that an update to 4.68 might cause
180Exim to "forget" previous rates that it had calculated, and reset them to zero.
181
182
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183Exim version 4.64
184-----------------
185
1861. Callouts were setting the name used for EHLO/HELO from $smtp_active_
187hostname. This is wrong, because it relates to the incoming message (and
188probably the interface on which it is arriving) and not to the outgoing
189callout (which could be using a different interface). This has been
190changed to use the value of the helo_data option from the smtp transport
191instead - this is what is used when a message is actually being sent. If
192there is no remote transport (possible with a router that sets up host
193addresses), $smtp_active_hostname is used. This change is mentioned here in
194case somebody is relying on the use of $smtp_active_hostname.
195
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1962. A bug has been fixed that might just possibly be something that is relied on
197in some configurations. In expansion items such as ${if >{xxx}{yyy}...} an
198empty string (that is {}) was being interpreted as if it was {0} and therefore
199treated as the number zero. From release 4.64, such strings cause an error
200because a decimal number, possibly followed by K or M, is required (as has
201always been documented).
202
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2033. There has been a change to the GnuTLS support (ChangeLog/PH/20) to improve
204Exim's performance. Unfortunately, this has the side effect of being slightly
205non-upwards compatible for versions 4.50 and earlier. If you are upgrading from
206one of these earlier versions and you use GnuTLS, you must remove the file
207called gnutls-params in Exim's spool directory. If you don't do this, you will
208see this error:
209
210 TLS error on connection from ... (DH params import): Base64 decoding error.
211
212Removing the file causes Exim to recompute the relevant encryption parameters
213and cache them in the new format that was introduced for release 4.51 (May
2142005). If you are upgrading from release 4.51 or later, there should be no
215problem.
216
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218Exim version 4.63
219-----------------
220
221When an SMTP error message is specified in a "message" modifier in an ACL, or
222in a :fail: or :defer: message in a redirect router, Exim now checks the start
223of the message for an SMTP error code. This consists of three digits followed
224by a space, optionally followed by an extended code of the form n.n.n, also
225followed by a space. If this is the case and the very first digit is the same
226as the default error code, the code from the message is used instead. If the
227very first digit is incorrect, a panic error is logged, and the default code is
228used. This is an incompatible change, but it is not expected to affect many (if
229any) configurations. It is possible to suppress the use of the supplied code in
230a redirect router by setting the smtp_error_code option false. In this case,
231any SMTP code is quietly ignored.
232
233
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234Exim version 4.61
235-----------------
236
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2371. The default number of ACL variables of each type has been increased to 20,
238and it's possible to compile Exim with more. You can safely upgrade to this
239release if you already have messages on the queue with saved ACL variable
240values. However, if you downgrade from this release with messages on the queue,
241any saved ACL values they may have will be lost.
242
2432. The default value for rfc1413_query_timeout has been changed from 30s to 5s.
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244
245
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246Exim version 4.54
247-----------------
248
249There was a problem with 4.52/TF/02 in that a "name=" option on control=
250submission terminated at the next slash, thereby not allowing for slashes in
251the name. This has been changed so that "name=" takes the rest of the string as
252its data. It must therefore be the last option.
253
254
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255Version 4.53
256------------
257
258If you are using the experimental Domain Keys support, you must upgrade to
259at least libdomainkeys 0.67 in order to run this release of Exim.
260
261
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262Version 4.51
263------------
264
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2651. The format in which GnuTLS parameters are cached (in the file gnutls-params
266in the spool directory) has been changed. The new format can also be generated
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267externally, so it is now possible to update the values from outside Exim. This
268has been implemented in an upwards, BUT NOT downwards, compatible manner.
269Upgrading should be seamless: when Exim finds that it cannot understand an
270existing cache file, it generates new parameters and writes them to the cache
271in the new format. If, however, you downgrade from 4.51 to a previous release,
272you MUST delete the gnutls-params file in the spool directory, because the
273older Exim will not recognize the new format.
274
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2752. When doing a callout as part of verifying an address, Exim was not paying
276attention to any local part prefix or suffix that was matched by the router
277that accepted the address. It now behaves in the same way as it does for
278delivery: the affixes are removed from the local part unless
279rcpt_include_affixes is set on the transport. If you have a configuration that
280uses prefixes or suffixes on addresses that could be used for callouts, and you
281want the affixes to be retained, you must make sure that rcpt_include_affixes
282is set on the transport.
283
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2843. Bounce and delay warning messages no longer contain details of delivery
285errors, except for explicit messages (e.g. generated by :fail:) and SMTP
286responses from remote hosts.
287
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289Version 4.50
290------------
291
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292The exicyclog script has been updated to use three-digit numbers in rotated log
293files if the maximum number to keep is greater than 99. If you are already
294keeping more than 99, there will be an incompatible change when you upgrade.
295You will probably want to rename your old log files to the new form before
c3af992c 296running the new exicyclog.
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297
298
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299Version 4.42
300------------
301
302RFC 3848 specifies standard names for the "with" phrase in Received: header
303lines when AUTH and/or TLS are in use. This is the "received protocol"
304field. Exim used to use "asmtp" for authenticated SMTP, without any
305indication (in the protocol name) for TLS use. Now it follows the RFC and
306uses "esmtpa" if the connection is authenticated, "esmtps" if it is
307encrypted, and "esmtpsa" if it is both encrypted and authenticated. These names
308appear in log lines as well as in Received: header lines.
309
310
311Version 4.34
312------------
313
314Change 4.31/2 gave problems to data ACLs and local_scan() functions that
315expected to see a Received: header. I have changed to yet another scheme. The
316Received: header is now generated after the body is received, but before the
317ACL or local_scan() is called. After they have run, the timestamp in the
318Received: header is updated.
319
320Thus, change (a) of 4.31/2 has been reversed, but change (b) is still true,
321which is lucky, since I decided it was a bug fix.
322
323
324Version 4.33
325------------
326
327If an expansion in a condition on a "warn" statement fails because a lookup
328defers, the "warn" statement is abandoned, and the next ACL statement is
329processed. Previously this caused the whole ACL to be aborted.
330
331
332Version 4.32
333------------
334
335Change 4.31/2 has been reversed, as it proved contentious. Recipient callout
336verification now uses <> in the MAIL command by default, as it did before. A
337new callout option, "use_sender", has been added to request the other
338behaviour.
339
340
341Version 4.31
342------------
343
3441. If you compile Exim to use GnuTLS, it now requires the use of release 1.0.0
345 or greater. The interface to the obsolete 0.8.x releases is no longer
346 supported. There is one externally visible change: the format for the
347 display of Distinguished Names now uses commas as a separator rather than a
348 slash. This is to comply with RFC 2253.
349
3502. When a message is received, the Received: header line is now generated when
351 reception is complete, instead of at the start of reception. For messages
352 that take a long time to come in, this changes the meaning of the timestamp.
353 There are several side-effects of this change:
354
355 (a) If a message is rejected by a DATA or non-SMTP ACL, or by local_scan(),
356 the logged header lines no longer include the local Received: line,
357 because it has not yet been created. If the message is a non-SMTP one,
358 and the error is processed by sending a message to the sender, the copy
359 of the original message that is returned does not have an added
360 Received: line.
361
362 (b) When a filter file is tested using -bf, no additional Received: header
363 is added to the test message. After some thought, I decided that this
364 is a bug fix.
365
366 The contents of $received_for are not affected by this change. This
367 variable still contains the single recipient of a message, copied after
368 addresses have been rewritten, but before local_scan() is run.
369
3702. Recipient callout verification, like sender verification, was using <> in
371 the MAIL FROM command. This isn't really the right thing, since the actual
372 sender may affect whether the remote host accepts the recipient or not. I
373 have changed it to use the actual sender in the callout; this means that
374 the cache record is now keyed on a recipient/sender pair, not just the
375 recipient address. There doesn't seem to be a real danger of callout loops,
376 since a callout by the remote host to check the sender would use <>.
377
378
379Version 4.30
380------------
381
3821. I have abolished timeout_DNS as an error that can be detected in retry
383 rules, because it has never worked. Despite the fact that it has been
384 documented since at least release 1.62, there was no code to support it.
385 If you have used it in your retry rules, you will now get a warning message
386 to the log and panic log. It is now treated as plain "timeout".
387
3882. After discussion on the mailing list, Exim no longer adds From:, Date:, or
389 Message-Id: header lines to messages that do not originate locally, that is,
390 messages that have an associated sending host address.
391
3923. When looking up a host name from an IP address, Exim now tries the DNS
393 first, and only if that fails does it use gethostbyaddr() (or equivalent).
394 This change was made because on some OS, not all the names are given for
395 addresses with multiple PTR records via the gethostbyaddr() interface. The
396 order of lookup can be changed by setting host_lookup_order.
397
398
399Version 4.23
400------------
401
4021. The new FIXED_NEVER_USERS build-time option creates a list of "never users"
403 that cannot be overridden. The default in the distributed EDITME is "root".
404 If for some reason you were (against advice) running deliveries as root, you
405 will have to ensure that FIXED_NEVER_USERS is not set in your
406 Local/Makefile.
407
4082. The ${quote: operator now quotes an empty string, which it did not before.
409
4103. Version 4.23 saves the contents of the ACL variables with the message, so
411 that they can be used later. If one of these variables contains a newline,
412 there will be a newline character in the spool that will not be interpreted
413 correctely by a previous version of Exim. (Exim ignores keyed spool file
414 items that it doesn't understand - precisely for this kind of problem - but
415 it expects them all to be on one line.)
416
417 So the bottom line is: if you have newlines in your ACL variables, you
418 cannot retreat from 4.23.
419
420
421Version 4.21
422------------
423
4241. The idea of the "warn" ACL verb is that it adds a header or writes to the
425 log only when "message" or "log_message" are set. However, if one of the
426 conditions was an address verification, or a call to a nested ACL, the
427 messages generated by the underlying test were being passed through. This
428 no longer happens. The underlying message is available in $acl_verify_
429 message for both "message" and "log_message" expansions, so it can be
430 passed through if needed.
431
4322. The way that the $h_ (and $header_) expansions work has been changed by the
433 addition of RFC 2047 decoding. See the main documentation (the NewStuff file
434 until release 4.30, then the manual) for full details. Briefly, there are
435 now three forms:
436
437 $rh_xxx: and $rheader_xxx: give the original content of the header
438 line(s), with no processing at all.
439
440 $bh_xxx: and $bheader_xxx: remove leading and trailing white space, and
441 then decode base64 or quoted-printable "words" within the header text,
442 but do not do charset translation.
443
444 $h_xxx: and $header_xxx: attempt to translate the $bh_ string to a
445 standard character set.
446
447 If you have previously been using $h_ expansions to access the raw
448 characters, you should change to $rh_ instead.
449
4503. When Exim creates an RFC 2047 encoded word in a header line, it labels it
451 with the default character set from the headers_charset option instead of
452 always using iso-8859-1.
453
4544. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
455 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
456 called TMPDIR, and if it finds it is different, it changes its value.
457
4585. Following a discussion on the list, the rules by which Exim recognises line
459 endings on incoming messages have been changed. The -dropcr and drop_cr
460 options are now no-ops, retained only for backwards compatibility. The
461 following line terminators are recognized: LF CRLF CR. However, special
462 processing applies to CR:
463
464 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
465 nor a local message in the state where . is a terminator.
466
467 (ii) If a bare CR is encountered in a header line, an extra space is added
468 after the line terminator so as not to end the header. The reasoning
469 behind this is that bare CRs in header lines are most likely either
470 to be mistakes, or people trying to play silly games.
471
4726. The code for using daemon_smtp_port, local_interfaces, and the -oX options
473 has been reorganized. It is supposed to be backwards compatible, but it is
474 mentioned here just in case I've screwed up.
475
476
477
478Version 4.20
479------------
480
4811. I have tidied and re-organized the code that uses alarm() for imposing time
482 limits on various things. It shouldn't affect anything, but if you notice
483 processes getting stuck, it may be that I've broken something.
484
4852. The "arguments" log selector now also logs the current working directory
486 when Exim is called.
487
4883. An incompatible change has been made to the appendfile transport. This
489 affects the case when it is used for file deliveries that are set up by
490 .forward and filter files. Previously, any settings of the "file" or
491 "directory" options were ignored. It is hoped that, like the address_file
492 transport in the default configuration, these options were never in fact set
493 on such transports, because they were of no use.
494
495 Now, if either of these options is set, it is used. The path that is passed
496 by the router is in $address_file (this is not new), so it can be used as
497 part of a longer path, or modified in any other way that expansion permits.
498
499 If neither "file" nor "directory" is set, the behaviour is unchanged.
500
5014. Related to the above: in a filter, if a "save" command specifies a non-
502 absolute path, the value of $home/ is pre-pended. This no longer happens if
503 $home is unset or is set to an empty string.
504
5055. Multiple file deliveries from a filter or .forward file can never be
506 batched; the value of batch_max on the transport is ignored for file
507 deliveries. I'm assuming that nobody ever actually set batch_max on the
508 address_file transport - it would have had odd effects previously.
509
5106. DESTDIR is the more common variable that ROOT for use when installing
511 software under a different root filing system. The Exim install script now
512 recognizes DESTDIR first; if it is not set, ROOT is used.
513
5147. If DESTDIR is set when installing Exim, it no longer prepends its value to
515 the path of the system aliases file that appears in the default
516 configuration (when a default configuration is installed). If an aliases
517 file is actually created, its name *does* use the prefix.
518
519
520Version 4.14
521------------
522
5231. The default for the maximum number of unknown SMTP commands that Exim will
524accept before dropping a connection has been reduced from 5 to 3. However, you
525can now change the value by setting smtp_max_unknown_commands.
526
5272. The ${quote: operator has been changed so that it turns newline and carriage
528return characters into \n and \r, respectively.
529
5303. The file names used for maildir messages now include the microsecond time
531fraction as well as the time in seconds, to cope with systems where the process
532id can be re-used within the same second. The format is now
533
534 <time>.H<microsec>P<pid>.<host>
535
536This should be a compatible change, but is noted here just in case.
537
5384. The rules for creating message ids have changed, to cope with systems where
539the process id can be re-used within the same second. The format, however, is
540unchanged, so this should not cause any problems, except as noted in the next
541item.
542
5435. The maximum value for localhost_number has been reduced from 255 to 16, in
544order to implement the new message id rules. For operating systems that have
545case-insensitive file systems (Cygwin and Darwin), the limit is 10.
546
5476. verify = header_syntax was allowing unqualified addresses in all cases. Now
548it allows them only for locally generated messages and from hosts that match
549sender_unqualified_hosts or recipient_unqualified_hosts, respectively.
550
5517. For reasons lost in the mists of time, when a pipe transport was run, the
552environment variable MESSAGE_ID was set to the message ID preceded by 'E' (the
553form used in Message-ID: header lines). The 'E' has been removed.
554
555
556Version 4.11
557------------
558
5591. The handling of lines in the configuration file has changed. Previously,
560macro expansion was applied to logical lines, after continuations had been
561joined on. This meant that it could not be used in .include lines, which are
562handled as physical rather than logical lines. Macro expansion is now done on
563physical lines rather than logical lines. This means there are two
564incompatibilities:
565
566 (a) A macro that expands to # to turn a line into a comment now applies only
567 to the physical line where it appears. Previously, it would have caused
568 any following continuations also to be ignored.
569
570 (b) A macro name can no longer be split over the boundary between a line and
571 its continuation. Actually, this is more of a bug fix. :-)
572
5732. The -D command line option must now all be within one command line item.
574This makes it possible to use -D to set a macro to the empty string by commands
575such as
576
577 exim -DABC ...
578 exim -DABC= ...
579
580Previously, these items would have moved on to the next item on the command
581line. To include spaces in a macro definition item, quotes must be used, in
582which case you can also have spaces after -D and surrounding the equals. For
583example:
584
585 exim '-D ABC = something' ...
586
5873. The way that addresses that redirect to themselves are handled has been
588changed, in order to fix an obscure bug. This should not cause any problems
589except in the case of wanting to go back from a 4.11 (or later) release to an
590earlier release. If there are undelivered messages on the spool that contain
591addresses which redirect to themselves, and the redirected addresses have
592already been delivered, you might get a duplicate delivery if you revert to an
593earlier Exim.
594
5954. The default way of looking up IP addresses for hosts in the manualroute and
596queryprogram routers has been changed. If "byname" or "bydns" is explicitly
597specified, there is no change, but if no method is specified, Exim now behaves
598as follows:
599
600 First, a DNS lookup is done. If this yields anything other than
601 HOST_NOT_FOUND, that result is used. Otherwise, Exim goes on to try a call to
602 getipnodebyname() (or gethostbyname() on older systems) and the result of the
603 lookup is the result of that call.
604
605This change has been made because it has been discovered that on some systems,
606if a DNS lookup called via getipnodebyname() times out, HOST_NOT_FOUND is
607returned instead of TRY_AGAIN. Thus, it is safest to try a DNS lookup directly
608first, and only if that gives a definite "no such host" to try the local
609function.
610
6115. In fixing the minor security problem with pid_file_path, I have removed some
612backwards-compatible (undocumented) code which was present to ease conversion
613from Exim 3. In Exim 4, pid_file_path is a literal; in Exim 3 it was allowed to
614contain "%s", which was replaced by the port number for daemons listening on
615non-standard ports. In Exim 4, such daemons do not write a pid file. The
616backwards compatibility feature was to replace "%s" by nothing if it occurred
617in an Exim 4 setting of pid_file_path. The bug was in this code. I have solved
618the problem by removing the backwards compatibility feature. Thus, if you still
619have "%s" somewhere in a setting of pid_file_path, you should remove it.
620
6216. There has been an extension to lsearch files. The keys in these files may
622now be quoted in order to allow for whitespace and colons in them. This means
623that if you were previously using keys that began with a doublequote, you will
624now have to wrap them with extra quotes and escape the internal quotes. The
625possibility that anybody is actually doing this seems extremely remote, but it
626is documented just in case.
627
628
629Version 4.10
630------------
631
632The build-time parameter EXIWHAT_KILL_ARG has been renamed EXIWHAT_KILL_SIGNAL
633to better reflect its function. The OS-specific files have been updated. Only
634if you have explicitly set this in your Makefile (highly unlikely) do you need
635to change anything.
636
637****