X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/af46795e64ccdde2432105a8549a5da4b54546e9..2e3177124893f623c037a44f7972d7d4105da87a:/doc/doc-txt/ChangeLog?ds=inline

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-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.195 2005/08/02 13:43:04 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.546 2008/03/27 13:23:40 tom Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
 
+Exim version 4.70
+-----------------
+
+TK/01 Added patch by Johannes Berg that expands the main option
+      "spamd_servers" if it starts with a dollar sign.
+
+TK/02 Write list of recipients to X-Envelope-Sender header when building
+      the mbox-format spool file for content scanning (suggested by Jakob
+      Hirsch)
+
+TK/03 Added patch by Wolfgang Breyha that adds experimental DCC
+      (http://www.dcc-servers.net/) support via dccifd. Activated by
+      setting EXPERIMENTAL_DCC=yes in Local/Makefile. Check out
+      experimental_spec.txt for more documentation.
+
+TK/04 Bugzilla 673: Add f-protd malware scanner support. Patch submitted
+      by Mark Daniel Reidel <mr@df.eu>.
+
+NM/01 Bugzilla 657: Embedded PCRE removed from the exim source tree.
+      When building exim an external PCRE library is now needed -
+      PCRE is a system library on the majority of modern systems.
+      See entry on PCRE_LIBS in EDITME file.
+
+NM/02 Bugzilla 646: Removed unwanted C/R in Dovecot authenticator
+      conversation.  Added nologin parameter to request.
+      Patch contributed by Kirill Miazine
+
+TF/01 Do not log submission mode rewrites if they do not change the address.
+
+TF/02 Bugzilla 662: Fix stack corruption before exec() in daemon.c.
+
+NM/03 Bugzilla 602: exicyclog now handles panic log, and creates empty
+      log files in place.  Contributed by Roberto Lima
+
+NM/04 Bugzilla 667: close socket used by dovecot authenticator
+
+TF/03 Bugzilla 615: When checking the local_parts router precondition
+      after a local_part_suffix or local_part_prefix option, Exim now
+      does not use the address's named list lookup cache, since this
+      contains cached lookups for the whole local part.
+
+NM/05 Bugzilla 521: Integrated SPF Best Guess support contributed by
+      Robert Millan.  Documentation is in experimental-spec.txt
+
+TF/04 Bugzilla 668: Fix parallel build (make -j).
+
+
+Exim version 4.69
+-----------------
+
+TK/01 Add preliminary DKIM support. Currently requires a forked version of
+      ALT-N's libdkim that I have put here:
+      http://duncanthrax.net/exim-experimental/
+
+      Note to Michael Haardt: I had to rename some vars in sieve.c. They
+      were called 'true' and it seems that C99 defines that as a reserved
+      keyword to be used with 'bool' variable types. That means you could
+      not include C99-style headers which use bools without triggering
+      build errors in sieve.c.
+
+NM/01 Bugzilla 592: --help option is handled incorrectly if exim is invoked
+      as mailq or other aliases.  Changed the --help handling significantly
+      to do whats expected.  exim_usage() emits usage/help information.
+
+SC/01 Added the -bylocaldomain option to eximstats.
+
+NM/02 Bugzilla 619: Defended against bad data coming back from gethostbyaddr
+
+NM/03 Bugzilla 613: Documentation fix for acl_not_smtp
+
+NM/04 Bugzilla 628: PCRE update to 7.4 (work done by John Hall)
+
+
+Exim version 4.68
+-----------------
+
+PH/01 Another patch from the Sieve maintainer.
+
+PH/02 When an IPv6 address is converted to a string for single-key lookup
+      in an address list (e.g. for an item such as "net24-dbm;/net/works"),
+      dots are used instead of colons so that keys in lsearch files need not
+      contain colons. This was done some time before quoting was made available
+      in lsearch files. However, iplsearch files do require colons in IPv6 keys
+      (notated using the quote facility) so as to distinguish them from IPv4
+      keys. This meant that lookups for IP addresses in host lists did not work
+      for iplsearch lookups.
+
+      This has been fixed by arranging for IPv6 addresses to be expressed with
+      colons if the lookup type is iplsearch. This is not incompatible, because
+      previously such lookups could never work.
+
+      The situation is now rather anomolous, since one *can* have colons in
+      ordinary lsearch keys. However, making the change in all cases is
+      incompatible and would probably break a number of configurations.
+
+TK/01 Change PRVS address formatting scheme to reflect latests BATV draft
+      version.
+
+MH/01 The "spam" ACL condition code contained a sscanf() call with a %s
+      conversion specification without a maximum field width, thereby enabling
+      a rogue spamd server to cause a buffer overflow. While nobody in their
+      right mind would setup Exim to query an untrusted spamd server, an
+      attacker that gains access to a server running spamd could potentially
+      exploit this vulnerability to run arbitrary code as the Exim user.
+
+TK/02 Bugzilla 502: Apply patch to make the SPF-Received: header use
+      $primary_hostname instead of what libspf2 thinks the hosts name is.
+
+MH/02 The dsearch lookup now uses lstat(2) instead of stat(2) to look for
+      a directory entry by the name of the lookup key. Previously, if a
+      symlink pointed to a non-existing file or a file in a directory that
+      Exim lacked permissions to read, a lookup for a key matching that
+      symlink would fail. Now it is enough that a matching directory entry
+      exists, symlink or not. (Bugzilla 503.)
+
+PH/03 The body_linecount and body_zerocount variables are now exported in the
+      local_scan API.
+
+PH/04 Added the $dnslist_matched variable.
+
+PH/05 Unset $tls_cipher and $tls_peerdn before making a connection as a client.
+      This means they are set thereafter only if the connection becomes
+      encrypted.
+
+PH/06 Added the client_condition to authenticators so that some can be skipped
+      by clients under certain conditions.
+
+PH/07 The error message for a badly-placed control=no_multiline_responses left
+      "_responses" off the end of the name.
+
+PH/08 Added -Mvc to output a copy of a message in RFC 2822 format.
+
+PH/09 Tidied the code for creating ratelimiting keys, creating them explicitly
+      (without spaces) instead of just copying the configuration text.
+
+PH/10 Added the /noupdate option to the ratelimit ACL condition.
+
+PH/11 Added $max_received_linelength.
+
+PH/12 Added +ignore_defer and +include_defer to host lists.
+
+PH/13 Installed PCRE version 7.2. This needed some changes because of the new
+      way in which PCRE > 7.0 is built.
+
+PH/14 Implemented queue_only_load_latch.
+
+PH/15 Removed an incorrect (int) cast when reading the value of SIZE in a
+      MAIL command. The effect was to mangle the value on 64-bit systems.
+
+PH/16 Another patch from the Sieve maintainer.
+
+PH/17 Added the NOTQUIT ACL, based on a patch from Ted Cooper.
+
+PH/18 If a system quota error occurred while trying to create the file for
+      a maildir delivery, the message "Mailbox is full" was not appended to the
+      bounce if the delivery eventually timed out. Change 4.67/27 below applied
+      only to a quota excession during the actual writing of the file.
+
+PH/19 It seems that peer DN values may contain newlines (and other non-printing
+      characters?) which causes problems in log lines. The DN values are now
+      passed through string_printing() before being added to log lines.
+
+PH/20 Added the "servers=" facility to MySQL and PostgreSQL lookups. (Oracle
+      and InterBase are left for another time.)
+
+PH/21 Added message_body_newlines option.
+
+PH/22 Guard against possible overflow in moan_check_errorcopy().
+
+PH/23 POSIX allows open() to be a macro; guard against that.
+
+PH/24 If the recipient of an error message contained an @ in the local part
+      (suitably quoted, of course), incorrect values were put in $domain and
+      $local_part during the evaluation of errors_copy.
+
+
+Exim version 4.67
+-----------------
+
+MH/01 Fix for bug #448, segfault in Dovecot authenticator when interface_address
+      is unset (happens when testing with -bh and -oMi isn't used). Thanks to
+      Jan Srzednicki.
+
+PH/01 Added a new log selector smtp_no_mail, to log SMTP sessions that do not
+      issue a MAIL command.
+
+PH/02 In an ACL statement such as
+
+        deny dnslists = X!=127.0.0.2 : X=127.0.0.2
+
+      if a client was not listed at all, or was listed with a value other than
+      127.0.0.2, in the X list, but was listed with 127.0.0.2 in the Y list,
+      the condition was not true (as it should be), so access was not denied.
+      The bug was that the ! inversion was incorrectly passed on to the second
+      item. This has been fixed.
+
+PH/03 Added additional dnslists conditions == and =& which are different from
+      = and & when the dns lookup returns more than one IP address.
+
+PH/04 Added gnutls_require_{kx,mac,protocols} to give more control over the
+      cipher suites used by GnuTLS. These options are ignored by OpenSSL.
+
+PH/05 After discussion on the list, added a compile time option ENABLE_DISABLE_
+      FSYNC, which compiles an option called disable_fsync that allows for
+      bypassing fsync(). The documentation is heavily laced with warnings.
+
+SC/01 Updated eximstats to collate all SpamAssassin rejects into one bucket.
+
+PH/06 Some tidies to the infrastructure of the Test Suite that is concerned
+      with the auxiliary C programs that it uses: (1) Arrange for BIND_8_COMPAT
+      to be defined when compiling on OSX (Darwin); (2) Tidies to the Makefile,
+      including adding "make clean"; (3) Added -fPIC when compiling the test
+      dynamically loaded module, to get rid of a warning.
+
+MH/02 Fix for bug #451, causing paniclog entries to be written if a bounce
+      message fails, move_frozen_messages = true and ignore_bounce_errors_after
+      = 0s. The bug is otherwise harmless.
+
+PH/07 There was a bug in the dovecot authenticator such that the value of
+      $auth1 could be overwritten, and so not correctly preserved, after a
+      successful authentication. This usually meant that the value preserved by
+      the server_setid option was incorrect.
+
+PH/08 Added $smtp_count_at_connection_start, deliberately with a long name.
+
+PH/09 Installed PCRE release 7.0.
+
+PH/10 The acl_not_smtp_start ACL was, contrary to the documentation, not being
+      run for batched SMTP input. It is now run at the start of every message
+      in the batch. While fixing this I discovered that the process information
+      (output by running exiwhat) was not always getting set for -bs and -bS
+      input. This is fixed, and it now also says "batched" for BSMTP.
+
+PH/11 Added control=no_pipelining.
+
+PH/12 Added $sending_ip_address and $sending_port (mostly Magnus Holmgren's
+      patch, slightly modified), and move the expansion of helo_data till after
+      the connection is made in the smtp transport (so it can use these
+      values).
+
+PH/13 Added ${rfc2047d: to decoded RFC 2047 strings.
+
+PH/14 Added log_selector = +pid.
+
+PH/15 Flush SMTP output before delaying, unless control=no_delay_flush is set.
+
+PH/16 Add ${if forany and ${if forall.
+
+PH/17 Added dsn_from option to vary the From: line in DSNs.
+
+PH/18 Flush SMTP output before performing a callout, unless control =
+      no_callout_flush is set.
+
+PH/19 Change 4.64/PH/36 introduced a bug: when address_retry_include_sender
+      was true (the default) a successful delivery failed to delete the retry
+      item, thus causing premature timeout of the address. The bug is now
+      fixed.
+
+PH/20 Added hosts_avoid_pipelining to the smtp transport.
+
+PH/21 Long custom messages for fakedefer and fakereject are now split up
+      into multiline reponses in the same way that messages for "deny" and
+      other ACL rejections are.
+
+PH/22 Applied Jori Hamalainen's speed-up changes and typo fixes to exigrep,
+      with slight modification.
+
+PH/23 Applied sieve patches from the maintainer "tracking the latest notify
+      draft, changing the syntax and factoring some duplicate code".
+
+PH/24 When the log selector "outgoing_port" was set, the port was shown as -1
+      for deliveries of the second and subsequent messages over the same SMTP
+      connection.
+
+PH/25 Applied Magnus Holmgren's patch for ${addresses, ${map, ${filter, and
+      ${reduce, with only minor "tidies".
+
+SC/02 Applied Daniel Tiefnig's patch to improve the '($parent) =' pattern match.
+
+PH/26 Added a "continue" ACL modifier that does nothing, for the benefit of its
+      expansion side effects.
+
+PH/27 When a message times out after an over-quota error from an Exim-imposed
+      quota, the bounce message says "mailbox is full". This message was not
+      being given when it was a system quota that was exceeded. It now should
+      be the same.
+
+MH/03 Made $recipients available in local_scan(). local_scan() already has
+      better access to the recipient list through recipients_list[], but
+      $recipients can be useful in postmaster-provided expansion strings.
+
+PH/28 The $smtp_command and $smtp_command_argument variables were not correct
+      in the case of a MAIL command with additional options following the
+      address, for example: MAIL FROM:<foo@bar> SIZE=1234. The option settings
+      were accidentally chopped off.
+
+PH/29 SMTP synchronization checks are implemented when a command is read -
+      there is a check that no more input is waiting when there shouldn't be
+      any. However, for some commands, a delay in an ACL can mean that it is
+      some time before the response is written. In this time, more input might
+      arrive, invalidly. So now there are extra checks after an ACL has run for
+      HELO/EHLO and after the predata ACL, and likewise for MAIL and RCPT when
+      pipelining has not been advertised.
+
+PH/30 MH's patch to allow iscntrl() characters to be list separators.
+
+PH/31 Unlike :fail:, a custom message specified with :defer: was not being
+      returned in the SMTP response when smtp_return_error_details was false.
+      This has been fixed.
+
+PH/32 Change the Dovecot authenticator to use read() and write() on the socket
+      instead of the C I/O that was originally supplied, because problems were
+      reported on Solaris.
+
+PH/33 Compile failed with OpenSSL 0.9.8e. This was due to a coding error in
+      Exim which did not show up earlier: it was assuming that a call to
+      SSL_CTX_set_info_callback() might give an error value. In fact, there is
+      no error. In previous releases of OpenSSL, SSL_CTX_set_info_callback()
+      was a macro that became an assignment, so it seemed to work. This has
+      changed to a proper function call with a void return, hence the compile
+      error. Exim's code has been fixed.
+
+PH/34 Change HDA_SIZE in oracle.c from 256 to 512. This is needed for 64-bit
+      cpus.
+
+PH/35 Applied a patch from the Sieve maintainer which fixes a bug in "notify".
+
+PH/36 Applied John Jetmore's patch to add -v functionality to exigrep.
+
+PH/37 If a message is not accepted after it has had an id assigned (e.g.
+      because it turns out to be too big or there is a timeout) there is no
+      "Completed" line in the log. When some messages of this type were
+      selected by exigrep, they were listed as "not completed". Others were
+      picked up by some special patterns. I have improved the selection
+      criteria to be more general.
+
+PH/38 The host_find_failed option in the manualroute router can now be set
+      to "ignore", to completely ignore a host whose IP address cannot be
+      found. If all hosts are ignored, the behaviour is controlled by the new
+      host_all_ignored option.
+
+PH/39 In a list of hosts for manualroute, if one item (either because of multi-
+      homing or because of multiple MX records with /mx) generated more than
+      one IP address, and the following item turned out to be the local host,
+      all the secondary addresses of the first item were incorrectly removed
+      from the list, along with the local host and any following hosts (which
+      is what is supposed to happen).
+
+PH/40 When Exim receives a message, it writes the login name, uid, and gid of
+      whoever called Exim into the -H file. In the case of the daemon it was
+      behaving confusingly. When first started, it used values for whoever
+      started the daemon, but after a SIGHUP it used the Exim user (because it
+      calls itself on a restart). I have changed the code so that it now always
+      uses the Exim user.
+
+PH/41 (Following a suggestion from Tony Finch) If all the RCPT commands in a
+      message are rejected with the same error (e.g. no authentication or bad
+      sender address), and a DATA command is nevertheless sent (as can happen
+      with PIPELINING or a stupid MUA), the error message that was given to the
+      RCPT commands is included in the rejection of the DATA command. This is
+      intended to be helpful for MUAs that show only the final error to their
+      users.
+
+PH/42 Another patch from the Sieve maintainer.
+
+SC/02 Eximstats - Differentiate between permanent and temporary rejects.
+      Eximstats - Fixed some broken HTML links and added missing column headers
+                  (Jez Hancock).
+      Eximstats - Fixed Grand Total Summary Domains, Edomains, and Email
+                  columns for Rejects, Temp Rejects, Ham, and Spam rows.
+
+SC/03 Eximstats - V1.58 Fix to get <> and blackhole to show in edomain tables.
+
+PH/43 Yet another patch from the Sieve maintainer.
+
+PH/44 I found a way to check for a TCP/IP connection going away before sending
+      the response to the final '.' that terminates a message, but only in the
+      case where the client has not sent further data following the '.'
+      (unfortunately, this is allowed). However, in many cases there won't be
+      any further data because there won't be any more messages to send. A call
+      to select() can be used: if it shows that the input is "ready", there is
+      either input waiting, or the socket has been closed. An attempt to read
+      the next input character can distinguish the two cases. Previously, Exim
+      would have sent an OK response which the client would never have see.
+      This could lead to message repetition. This fix should cure that, at
+      least in a lot of common cases.
+
+PH/45 Do not advertise STARTTLS in response to HELP unless it would be
+      advertised in response to EHLO.
+
+
+Exim version 4.66
+-----------------
+
+PH/01 Two more bugs that were introduced by 4.64/PH/07, in addition to the one
+      fixed by 4.65/MH/01 (is this a record?) are fixed:
+
+      (i)  An empty string was always treated as zero by the numeric comparison
+           operators. This behaviour has been restored.
+
+      (ii) It is documented that the numeric comparison operators always treat
+           their arguments as decimal numbers. This was broken in that numbers
+           starting with 0 were being interpreted as octal.
+
+      While fixing these problems I realized that there was another issue that
+      hadn't been noticed. Values of message_size_limit (both the global option
+      and the transport option) were treated as octal if they started with 0.
+      The documentation was vague. These values are now always treated as
+      decimal, and I will make that clear in the documentation.
+
+
+Exim version 4.65
+-----------------
+
+TK/01 Disable default definition of HAVE_LINUX_SENDFILE. Clashes with
+      Linux large file support (_FILE_OFFSET_BITS=64) on older glibc
+      versions. (#438)
+
+MH/01 Don't check that the operands of numeric comparison operators are
+      integers when their expansion is in "skipping" mode (fixes bug
+      introduced by 4.64-PH/07).
+
+PH/01 If a system filter or a router generates more than SHRT_MAX (32767)
+      child addresses, Exim now panics and dies. Previously, because the count
+      is held in a short int, deliveries were likely to be lost. As such a
+      large number of recipients for a single message is ridiculous
+      (performance will be very, very poor), I have chosen to impose a limit
+      rather than extend the field.
+
+
+Exim version 4.64
+-----------------
+
+TK/01 Bugzilla #401. Fix DK spooling code so that it can overwrite a
+      leftover -K file (the existence of which was triggered by #402).
+      While we were at it, introduced process PID as part of the -K
+      filename. This should rule out race conditions when creating
+      these files.
+
+TK/02 Bugzilla #402. Apply patch from Simon Arlott, speeding up DK signing
+      processing considerably. Previous code took too long for large mails,
+      triggering a timeout which in turn triggers #401.
+
+TK/03 Introduced HAVE_LINUX_SENDFILE to os.h-Linux. Currently only used
+      in the DK code in transports.c. sendfile() is not really portable,
+      hence the _LINUX specificness.
+
+TF/01 In the add_headers option to the mail command in an Exim filter,
+      there was a bug that Exim would claim a syntax error in any
+      header after the first one which had an odd number of characters
+      in the field name.
+
+PH/01 If a server that rejects MAIL FROM:<> was the target of a sender
+      callout verification, Exim cached a "reject" for the entire domain. This
+      is correct for most verifications, but it is not correct for a recipient
+      verification with use_sender or use_postmaster set, because in that case
+      the callout does not use MAIL FROM:<>. Exim now distinguishes the special
+      case of MAIL FROM:<> rejection from other early rejections (e.g.
+      rejection of HELO). When verifying a recipient using a non-null MAIL
+      address, the cache is ignored if it shows MAIL FROM:<> rejection.
+      Whatever the result of the callout, the value of the domain cache is
+      left unchanged (for any other kind of callout, getting as far as trying
+      RCPT means that the domain itself is ok).
+
+PH/02 Tidied a number of unused variable and signed/unsigned warnings that
+      gcc 4.1.1 threw up.
+
+PH/03 On Solaris, an unexpectedly close socket (dropped connection) can
+      manifest itself as EPIPE rather than ECONNECT. When tidying away a
+      session, the daemon ignores ECONNECT errors and logs others; it now
+      ignores EPIPE as well.
+
+PH/04 Applied Nico Erfurth's refactoring patch to tidy up mime.c
+      (quoted-printable decoding).
+
+PH/05 Applied Nico Erfurth's refactoring patch to tidy up spool_mbox.c, and
+      later the small subsequent patch to fix an introduced bug.
+
+PH/06 Installed the latest Cygwin Makefile from the Cygwin maintainer.
+
+PH/07 There was no check for overflow in expansions such as ${if >{1}{4096M}}.
+
+PH/08 An error is now given if message_size_limit is specified negative.
+
+PH/09 Applied and tidied up Jakob Hirsch's patch for allowing ACL variables
+      to be given (somewhat) arbitrary names.
+
+JJ/01 exipick 20060919.0, allow for arbitrary acl_ variables introduced
+      in 4.64-PH/09.
+
+JJ/02 exipick 20060919.0, --show-vars args can now be regular expressions,
+      miscellaneous code fixes
+
+PH/10 Added the log_reject_target ACL modifier to specify where to log
+      rejections.
+
+PH/11 Callouts were setting the name used for EHLO/HELO from $smtp_active_
+      hostname. This is wrong, because it relates to the incoming message (and
+      probably the interface on which it is arriving) and not to the outgoing
+      callout (which could be using a different interface). This has been
+      changed to use the value of the helo_data option from the smtp transport
+      instead - this is what is used when a message is actually being sent. If
+      there is no remote transport (possible with a router that sets up host
+      addresses), $smtp_active_hostname is used.
+
+PH/12 Installed Andrey Panin's patch to add a dovecot authenticator. Various
+      tweaks were necessary in order to get it to work (see also 21 below):
+      (a) The code assumed that strncpy() returns a negative number on buffer
+          overflow, which isn't the case. Replaced with Exim's string_format()
+          function.
+      (b) There were several signed/unsigned issues. I just did the minimum
+          hacking in of casts. There is scope for a larger refactoring.
+      (c) The code used strcasecmp() which is not a standard C function.
+          Replaced with Exim's strcmpic() function.
+      (d) The code set only $1; it now sets $auth1 as well.
+      (e) A simple test gave the error "authentication client didn't specify
+          service in request". It would seem that Dovecot has changed its
+          interface. Fortunately there's a specification; I followed it and
+          changed what the client sends and it appears to be working now.
+
+PH/13 Added $message_headers_raw to provide the headers without RFC 2047
+      decoding.
+
+PH/14 Corrected misleading output from -bv when -v was also used. Suppose the
+      address A is aliased to B and C, where B exists and C does not. Without
+      -v the output is "A verified" because verification stops after a
+      successful redirection if more than one address is generated. However,
+      with -v the child addresses are also verified. Exim was outputting "A
+      failed to verify" and then showing the successful verification for C,
+      with its parentage. It now outputs "B failed to verify", showing B's
+      parentage before showing the successful verification of C.
+
+PH/15 Applied Michael Deutschmann's patch to allow DNS black list processing to
+      look up a TXT record in a specific list after matching in a combined
+      list.
+
+PH/16 It seems that the options setting for the resolver (RES_DEFNAMES and
+      RES_DNSRCH) can affect the behaviour of gethostbyname() and friends when
+      they consult the DNS. I had assumed they would set it the way they
+      wanted; and indeed my experiments on Linux seem to show that in some
+      cases they do (I could influence IPv6 lookups but not IPv4 lookups).
+      To be on the safe side, however, I have now made the interface to
+      host_find_byname() similar to host_find_bydns(), with an argument
+      containing the DNS resolver options. The host_find_byname() function now
+      sets these options at its start, just as host_find_bydns() does. The smtp
+      transport options dns_qualify_single and dns_search_parents are passed to
+      host_find_byname() when gethostbyname=TRUE in this transport. Other uses
+      of host_find_byname() use the default settings of RES_DEFNAMES
+      (qualify_single) but not RES_DNSRCH (search_parents).
+
+PH/17 Applied (a modified version of) Nico Erfurth's patch to make
+      spool_read_header() do less string testing, by means of a preliminary
+      switch on the second character of optional "-foo" lines. (This is
+      overdue, caused by the large number of possibilities that now exist.
+      Originally there were few.) While I was there, I also converted the
+      str(n)cmp tests so they don't re-test the leading "-" and the first
+      character, in the hope this might squeeze out yet more improvement.
+
+PH/18 Two problems with "group" syntax in header lines when verifying: (1) The
+      flag allowing group syntax was set by the header_syntax check but not
+      turned off, possible causing trouble later; (2) The flag was not being
+      set at all for the header_verify test, causing "group"-style headers to
+      be rejected. I have now set it in this case, and also caused header_
+      verify to ignore an empty address taken from a group. While doing this, I
+      came across some other cases where the code for allowing group syntax
+      while scanning a header line wasn't quite right (mostly, not resetting
+      the flag correctly in the right place). These bugs could have caused
+      trouble for malformed header lines. I hope it is now all correct.
+
+PH/19 The functions {pwcheck,saslauthd}_verify_password() are always called
+      with the "reply" argument non-NULL. The code, however (which originally
+      came from elsewhere) had *some* tests for NULL when it wrote to *reply,
+      but it didn't always do it. This confused somebody who was copying the
+      code for some other use. I have removed all the tests.
+
+PH/20 It was discovered that the GnuTLS code had support for RSA_EXPORT, a
+      feature that was used to support insecure browsers during the U.S. crypto
+      embargo. It requires special client support, and Exim is probably the
+      only MTA that supported it -- and would never use it because real RSA is
+      always available. This code has been removed, because it had the bad
+      effect of slowing Exim down by computing (never used) parameters for the
+      RSA_EXPORT functionality.
+
+PH/21 On the advice of Timo Sirainen, added a check to the dovecot
+      authenticator to fail if there's a tab character in the incoming data
+      (there should never be unless someone is messing about, as it's supposed
+      to be base64-encoded). Also added, on Timo's advice, the "secured" option
+      if the connection is using TLS or if the remote IP is the same as the
+      local IP, and the "valid-client-cert option" if a client certificate has
+      been verified.
+
+PH/22 As suggested by Dennis Davis, added a server_condition option to *all*
+      authenticators. This can be used for authorization after authentication
+      succeeds. (In the case of plaintext, it servers for both authentication
+      and authorization.)
+
+PH/23 Testing for tls_required and lost_connection in a retry rule didn't work
+      if any retry times were supplied.
+
+PH/24 Exim crashed if verify=helo was activated during an incoming -bs
+      connection, where there is no client IP address to check. In this
+      situation, the verify now always succeeds.
+
+PH/25 Applied John Jetmore's -Mset patch.
+
+PH/26 Added -bem to be like -Mset, but loading a message from a file.
+
+PH/27 In a string expansion for a processed (not raw) header when multiple
+      headers of the same name were present, leading whitespace was being
+      removed from all of them, but trailing whitespace was being removed only
+      from the last one. Now trailing whitespace is removed from each header
+      before concatenation. Completely empty headers in a concatenation (as
+      before) are ignored.
+
+PH/28 Fixed bug in backwards-compatibility feature of PH/09 (thanks to John
+      Jetmore). It would have mis-read ACL variables from pre-4.61 spool files.
+
+PH/29 [Removed. This was a change that I later backed out, and forgot to
+      correct the ChangeLog entry (that I had efficiently created) before
+      committing the later change.]
+
+PH/30 Exim was sometimes attempting to deliver messages that had suffered
+      address errors (4xx response to RCPT) over the same connection as other
+      messages routed to the same hosts. Such deliveries are always "forced",
+      so retry times are not inspected. This resulted in far too many retries
+      for the affected addresses. The effect occurred only when there were more
+      hosts than the hosts_max_try setting in the smtp transport when it had
+      the 4xx errors. Those hosts that it had tried were not added to the list
+      of hosts for which the message was waiting, so if all were tried, there
+      was no problem. Two fixes have been applied:
+
+      (i)  If there are any address or message errors in an SMTP delivery, none
+           of the hosts (tried or untried) are now added to the list of hosts
+           for which the message is waiting, so the message should not be a
+           candidate for sending over the same connection that was used for a
+           successful delivery of some other message. This seems entirely
+           reasonable: after all the message is NOT "waiting for some host".
+           This is so "obvious" that I'm not sure why it wasn't done
+           previously. Hope I haven't missed anything, but it can't do any
+           harm, as the worst effect is to miss an optimization.
+
+      (ii) If, despite (i), such a delivery is accidentally attempted, the
+           routing retry time is respected, so at least it doesn't keep
+           hammering the server.
+
+PH/31 Installed Andrew Findlay's patch to close the writing end of the socket
+      in ${readsocket because some servers need this prod.
+
+PH/32 Added some extra debug output when updating a wait-xxx database.
+
+PH/33 The hint "could be header name not terminated by colon", which has been
+      given for certain expansion errors for a long time, was not being given
+      for the ${if def:h_colon_omitted{...  case.
+
+PH/34 The spec says: "With one important exception, whenever a domain list is
+      being scanned, $domain contains the subject domain." There was at least
+      one case where this was not true.
+
+PH/35 The error "getsockname() failed: connection reset by peer" was being
+      written to the panic log as well as the main log, but it isn't really
+      panic-worthy as it just means the connection died rather early on. I have
+      removed the panic log writing for the ECONNRESET error when getsockname()
+      fails.
+
+PH/36 After a 4xx response to a RCPT error, that address was delayed (in queue
+      runs only) independently of the message's sender address. This meant
+      that, if the 4xx error was in fact related to the sender, a different
+      message to the same recipient with a different sender could confuse
+      things. In particualar, this can happen when sending to a greylisting
+      server, but other circumstances could also provoke similar problems.
+      I have changed the default so that the retry time for these errors is now
+      based a combination of the sender and recipient addresses. This change
+      can be overridden by setting address_retry_include_sender=false in the
+      smtp transport.
+
+PH/37 For LMTP over TCP/IP (the smtp transport), error responses from the
+      remote server are returned as part of bounce messages. This was not
+      happening for LMTP over a pipe (the lmtp transport), but now it is the
+      same for both kinds of LMTP.
+
+PH/38 Despite being documented as not happening, Exim was rewriting addresses
+      in header lines that were in fact CNAMEs. This is no longer the case.
+
+PH/39 If -R or -S was given with -q<time>, the effect of -R or -S was ignored,
+      and queue runs started by the daemon processed all messages. This has
+      been fixed so that -R and -S can now usefully be given with -q<time>.
+
+PH/40 Import PCRE release 6.7 (fixes some bugs).
+
+PH/41 Add bitwise logical operations to eval (courtesy Brad Jorsch).
+
+PH/42 Give an error if -q is specified more than once.
+
+PH/43 Renamed the variables $interface_address and $interface_port as
+      $received_ip_address and $received_port, to make it clear that these
+      values apply to message reception, and not to the outgoing interface when
+      a message is delivered. (The old names remain recognized, of course.)
+
+PH/44 There was no timeout on the connect() call when using a Unix domain
+      socket in the ${readsocket expansion. There now is.
+
+PH/45 Applied a modified version of Brad Jorsch's patch to allow "message" to
+      be meaningful with "accept".
+
+SC/01 Eximstats V1.43
+     Bug fix for V1.42 with -h0 specified. Spotted by Chris Lear.
+
+SC/02 Eximstats V1.44
+      Use a glob alias rather than an array ref in the generated
+      parser. This improves both readability and performance.
+
+SC/03 Eximstats V1.45 (Marco Gaiarin / Steve Campbell)
+      Collect SpamAssassin and rejection statistics.
+      Don't display local sender or destination tables unless
+      there is data to show.
+      Added average volumes into the top table text output.
+
+SC/04 Eximstats V1.46
+      Collect data on the number of addresses (recipients)
+      as well as the number of messages.
+
+SC/05 Eximstats V1.47
+      Added 'Message too big' to the list of mail rejection
+      reasons (thanks to Marco Gaiarin).
+
+SC/06 Eximstats V1.48
+      Mainlog lines which have GMT offsets and are too short to
+      have a flag are now skipped.
+
+SC/07 Eximstats V1.49 (Alain Williams)
+      Added the -emptyok flag.
+
+SC/08 Eximstats V1.50
+      Fixes for obtaining the IP address from reject messages.
+
+JJ/03 exipick.20061117.2, made header handling as similar to exim as possible
+      (added [br]h_ prefixes, implemented RFC2047 decoding.  Fixed
+      whitesspace changes from 4.64-PH/27
+
+JJ/04 exipick.20061117.2, fixed format and added $message_headers_raw to
+      match 4.64-PH/13
+
+JJ/05 exipick.20061117.2, bug fixes (error out sooner when invalid criteria
+      are found, allow negative numbers in numeric criteria)
+
+JJ/06 exipick.20061117.2, added new $message_body_missing variable
+
+JJ/07 exipick.20061117.2, added $received_ip_address and $received_port
+      to match changes made in 4.64-PH/43
+
+PH/46 Applied Jori Hamalainen's patch to add features to exiqsumm.
+
+PH/47 Put in an explicit test for a DNS lookup of an address record where the
+      "domain" is actually an IP address, and force a failure. This locks out
+      those revolvers/nameservers that support "A-for-A" lookups, in
+      contravention of the specifications.
+
+PH/48 When a host name was looked up from an IP address, and the subsequent
+      forward lookup of the name timed out, the host name was left in
+      $sender_host_name, contrary to the specification.
+
+PH/49 Although default lookup types such as lsearch* or cdb*@ have always been
+      restricted to single-key lookups, Exim was not diagnosing an error if
+      * or *@ was used with a query-style lookup.
+
+PH/50 Increased the value of DH_BITS in tls-gnu.c from 768 to 1024.
+
+MH/01 local_scan ABI version incremented to 1.1. It should have been updated
+      long ago, but noone interested enough thought of it. Let's just say that
+      the "1.1" means that there are some new functions that weren't there at
+      some point in the past.
+
+PH/51 Error processing for expansion failure of helo_data from an smtp
+      transport during callout processing was broken.
+
+PH/52 Applied John Jetmore's patch to allow tls-on-connect and STARTTLS to be
+      tested/used via the -bh/-bhc/-bs options.
+
+PH/53 Added missing "#include <time.h>" to pcre/pcretest.c (this was a PCRE
+      bug, fixed in subsequent PCRE releases).
+
+PH/54 Applied Robert Bannocks' patch to avoid a problem with references that
+      arises when using the Solaris LDAP libraries (but not with OpenLDAP).
+
+PH/55 Check for a ridiculously long file name in exim_dbmbuild.
+
+
+Exim version 4.63
+-----------------
+
+SC/01 Use a glob alias rather than an array ref in eximstats generated
+      parser. This improves both readability and performance.
+
+SC/02 Collect SpamAssassin and rejection statistics in eximstats.
+      Don't display local sender or destination tables in eximstats unless
+      there is data to show.
+      Added average volumes into the eximstats top table text output.
+
+SC/03 Collect data on the number of addresses (recipients) as well
+      as the number of messages in eximstats.
+
+TF/01 Correct an error in the documentation for the redirect router. Exim
+      does (usually) call initgroups() when daemonizing.
+
+TF/02 Call initgroups() when dropping privilege in exim.c, so that Exim runs
+      with consistent privilege compared to when running as a daemon.
+
+TF/03 Note in the spec that $authenticated_id is not set for local
+      submissions from trusted users.
+
+TF/04 The ratelimit per_rcpt option now works correctly in acl_not_smtp.
+      Thanks to Dean Brooks <dean@iglou.com> for the patch.
+
+TF/05 Make it easier to get SMTP authentication and TLS/SSL support working
+      by adding some example configuration directives to the default
+      configuration file. A little bit of work is required to uncomment the
+      directives and define how usernames and passwords are checked, but
+      there is now a framework to start from.
+
+PH/01 Added #define LDAP_DEPRECATED 1 to ldap.c because some of the "old"
+      functions that Exim currently uses aren't defined in ldap.h for OpenLDAP
+      without this. I don't know how relevant this is to other LDAP libraries.
+
+PH/02 Add the verb name to the "unknown ACL verb" error.
+
+PH/03 Magnus Holmgren's patch for filter_prepend_home.
+
+PH/03 Fixed Bugzilla #101: macro definition between ACLs doesn't work.
+
+PH/04 Applied Magnus Holmgren's patch to fix Bugzilla #98: transport's home
+      directory not expanded when it should be if an expanded home directory
+      was set for the address (which is overridden by the transport).
+
+PH/05 Applied Alex Kiernan's patch to fix Bugzilla #99: a problem with
+      libradius.
+
+PH/06 Added acl_not_smtp_start, based on Johannes Berg's patch, and set the
+      bit to forbid control=suppress_local_fixups in the acl_not_smtp ACL,
+      because it is too late at that time, and has no effect.
+
+PH/07 Changed ${quote_pgsql to quote ' as '' instead of \' because of a
+      security issue with \' (bugzilla #107). I could not use the
+      PQescapeStringConn() function, because it needs a PGconn value as one of
+      its arguments.
+
+PH/08 When testing addresses using -bt, indicate those final addresses that
+      are duplicates that would not cause an additional delivery. At least one
+      person was confused, thinking that -bt output corresponded to deliveries.
+      (Suppressing duplicates isn't a good idea as you lose the information
+      about possibly different redirections that led to the duplicates.)
+
+PH/09 Applied patch from Erik to use select() instead of poll() in spam.c on
+      systems where poll() doesn't work, in particular OS X.
+
+PH/10 Added more information to debugging output for retry time not reached.
+
+PH/11 Applied patch from Arkadiusz Miskiewicz to apply a timeout to read
+      operations in malware.c.
+
+PH/12 Applied patch from Magnus Holmgren to include the "h" tag in Domain Keys
+      signatures.
+
+PH/13 If write_rejectlog was set false when logging was sent to syslog with
+      syslog_duplication set false, log lines that would normally be written
+      both the the main log and to the reject log were not written to syslog at
+      all.
+
+PH/14 In the default configuration, change the use of "message" in ACL warn
+      statements to "add_header".
+
+PH/15 Diagnose a filter syntax error for "seen", "unseen", or "noerror" if not
+      not followed by a command (e.g. "seen endif").
+
+PH/16 Recognize SMTP codes at the start of "message" in ACLs and after :fail:
+      and :defer: in a redirect router. Add forbid_smtp_code to suppress the
+      latter.
+
+PH/17 Added extra conditions to the default value of delay_warning_condition
+      so that it is now:
+
+        ${if or { \
+            { !eq{$h_list-id:$h_list-post:$h_list-subscribe:}{} } \
+            { match{$h_precedence:}{(?i)bulk|list|junk} } \
+            { match{$h_auto-submitted:}{(?i)auto-generated|auto-replied} } \
+            }{no}{yes}}
+
+      The Auto-Submitted: and various List- headers are standardised, whereas I
+      don't think Precedence: ever was.
+
+PH/18 Refactored debugging code in route_finduser() to show more information,
+      in particular, the error code if getpwnam() issues one.
+
+PH/19 Added PQsetClientEncoding(conn, "SQL_ASCII") to the pgsql code module.
+      This is apparently needed in addition to the PH/07 change above to avoid
+      any possible encoding problems.
+
+PH/20 Perl can change the locale. Exim was resetting it after a ${perl call,
+      but not after initializing Perl.
+
+PH/21 Added a call to PQsetNoticeProcessor() to catch pgsql "notices" and
+      output them only if debugging. By default they are written stderr,
+      apparently, which is not desirable.
+
+PH/22 Added Alain Williams' LDAP patch to support setting REFERRALS=off on
+      queries.
+
+JJ/01 exipick: added --reverse (and -R synonym), --random, --size, --sort and
+      --not options
+
+JJ/02 exipick: rewrote --help documentation to hopefully make more clear.
+
+PH/23 Made -oMaa and -oMt work with -bh and -bs to pretend the connection is
+      authenticated or an ident call has been made. Suppress the default
+      values for $authenticated_id and $authenticated_sender (but permit -oMai
+      and -oMas) when testing with -bh.
+
+PH/24 Re-jigged the order of the tests in the default configuration so that the
+      tests for valid domains and recipients precede the DNS black list and CSA
+      tests, on the grounds that those ones are more expensive.
+
+PH/25 Exim was not testing for a space following SMTP commands such as EHLO
+      that require one. Thus, EHLORHUBARB was interpreted as a valid command.
+      This bug exists in every version of Exim that I still have, right back to
+      0.12.
+
+PH/26 (n)wildlsearch lookups are documented as being done case-insensitively.
+      However, an attempt to turn on case-sensitivity in a regex key by
+      including (?-i) didn't work because the subject string was already
+      lowercased, and the effects were non-intuitive. It turns out that a
+      one-line patch can be used to allow (?-i) to work as expected.
+
+
+Exim version 4.62
+-----------------
+
+TF/01 Fix the add_header change below (4.61 PH/55) which had a bug that (amongst
+      other effects) broke the use of negated acl sub-conditions.
+
+PH/01 ${readsocket now supports Internet domain sockets (modified John Jetmore
+      patch).
+
+PH/02 When tcp-wrappers is called from Exim, it returns only "deny" or "allow".
+      "Deny" causes Exim to reject the incoming connection with a 554 error.
+      Unfortunately, if there is a major crisis, such as a disk failure,
+      tcp-wrappers gives "deny", whereas what one would like would be some
+      kind of temporary error. A kludge has been added to help with this.
+      Before calling hosts_ctl(), errno is set zero. If the result is "deny", a
+      554 error is used if errno is still zero or contains ENOENT (which occurs
+      if either of the /etc/hosts.{allow,deny} files is missing). Otherwise, a
+      451 error is used.
+
+PH/03 Add -lutil to the default FreeBSD LIBS setting.
+
+PH/04 Change PH/19 for 4.61 was too wide. It should not be applied to host
+      errors. Otherwise a message that provokes a temporary error (when other
+      messages do not) can cause a whole host to time out.
+
+PH/05 Batch deliveries by appendfile and pipe transports did not work when the
+      addresses were routed directly to files or pipes from a redirect router.
+      File deliveries just didn't batch; pipe deliveries might have suffered
+      odd errors.
+
+PH/06 A failure to get a lock for a hints database would erroneously always say
+      "Failed to get write lock", even when it was really a read lock.
+
+PH/07 The appendfile transport was creating MBX lock files with a fixed mode
+      of 0600. This has been changed to use the value of the lockfile_mode
+      option (which defaults to 0600).
+
+PH/08 Applied small patch from the Sieve maintainer.
+
+PH/09 If maildir_quota_directory_regex was set to exclude (say) the .Trash
+      folder from quota calculations, a direct delivery into this folder messed
+      up the contents of the maildirsize file. This was because the regex was
+      used only to exclude .Trash (or whatever) when the size of the mailbox
+      was calculated. There was no check that a delivery was happening into an
+      excluded directory. This bug has been fixed by ignoring all quota
+      processing for deliveries into excluded directories.
+
+PH/10 Added the maildirfolder_create_regex option to appendfile.
+
+
+Exim version 4.61
+-----------------
+
+PH/01 The code for finding all the local interface addresses on a FreeBSD
+      system running IPv6 was broken. This may well have applied to all BSD
+      systems, as well as to others that have similar system calls. The broken
+      code found IPv4 interfaces correctly, but gave incorrect values for the
+      IPv6 interfaces. In particular, ::1 was not found. The effect in Exim was
+      that it would not match correctly against @[] and not recognize the IPv6
+      addresses as local.
+
+PH/02 The ipliteral router was not recognizing addresses of the form user@
+      [ipv6:....] because it didn't know about the "ipv6:" prefix.
+
+PH/03 Added disable_ipv6.
+
+PH/04 Changed $reply_address to use the raw form of the headers instead of the
+      decoded form, because it is most often used to construct To: headers
+      lines in autoreplies, and the decoded form may well be syntactically
+      invalid. However, $reply_address has leading white space removed, and all
+      newlines turned into spaces so that the autoreply transport does not
+      grumble.
+
+PH/05 If group was specified without a user on a router, and no group or user
+      was specified on a transport, the group from the router was ignored.
+
+PH/06 Increased the number of ACL variables to 20 of each type, and arranged
+      for visible compile-time settings that can be used to change these
+      numbers, for those that want even more. Backwards compatibility with old
+      spool files has been maintained. However, going back to a previous Exim
+      release will lost any variables that are in spool files.
+
+PH/07 Two small changes when running in the test harness: increase delay when
+      passing a TCP/IP connection to a new process, in case the original
+      process has to generate a bounce, and remove special handling of
+      127.0.0.2 (sic), which is no longer necessary.
+
+PH/08 Changed debug output of dbfn_open() flags from numbers to names, so as to
+      be the same on different OS.
+
+PH/09 Moved a debug statement in filter processing to avoid a race problem when
+      testing.
+
+JJ/01 exipick: fixed bug where -b (brief) output option showed "Vars:"
+      whether --show-vars was specified or not
+
+JJ/02 exipick: Added support for new ACL variable spool format introduced
+      in 4.61-PH/06
+
+PH/10 Fixed another bug related to PH/04 above: if an incoming message had a
+      syntactically invalid From: or Reply-to: line, and a filter used this to
+      generate an autoreply, and therefore failed to obtain an address for the
+      autoreply, Exim could try to deliver to a non-existent relative file
+      name, causing unrelated and misleading errors. What now happens is that
+      it logs this as a hard delivery error, but does not attempt to create a
+      bounce message.
+
+PH/11 The exinext utility has a -C option for testing purposes, but although
+      the given file was scanned by exinext itself; it wasn't being passed on
+      when Exim was called.
+
+PH/12 In the smtp transport, treat an explicit ECONNRESET error the same as
+      an end-of-file indication when reading a command response.
+
+PH/13 Domain literals for IPv6 were not recognized unless IPv6 support was
+      compiled. In many other places in Exim, IPv6 addresses are always
+      recognized, so I have changed this. It also means that IPv4 domain
+      literals of the form [IPV4:n.n.n.n] are now always recognized.
+
+PH/14 When a uid/gid is specified for the queryprogram router, it cannot be
+      used if the router is not running as root, for example, when verifying at
+      ACL time, or when using -bh. The debugging output from this situation was
+      non-existent - all you got was a failure to exec. I have made two
+      changes:
+
+      (a) Failures to set uid/gid, the current directory, or a process leader
+          in a subprocess such as that created by queryprogram now generate
+          suitable debugging ouput when -d is set.
+
+      (b) The queryprogram router detects when it is not running as root,
+          outputs suitable debugging information if -d is set, and then runs
+          the subprocess without attempting to change uid/gid.
+
+PH/15 Minor change to Makefile for building test_host (undocumented testing
+      feature).
+
+PH/16 As discussed on the list in Nov/Dec: Exim no longer looks at the
+      additional section of a DNS packet that returns MX or SRV records.
+      Instead, it always explicitly searches for A/AAAA records. This avoids
+      major problems that occur when a DNS server includes only records of one
+      type (A or AAAA) in an MX/SRV packet. A byproduct of this change has
+      fixed another bug: if SRV records were looked up and the corresponding
+      address records were *not* found in the additional section, the port
+      values from the SRV records were lost.
+
+PH/17 If a delivery to a pipe, file, or autoreply was deferred, Exim was not
+      using the correct key (the original address) when searching the retry
+      rules in order to find which one to use for generating the retry hint.
+
+PH/18 If quota_warn_message contains a From: header, Exim now refrains from
+      adding the default one. Similarly, if it contains a Reply-To: header, the
+      errors_reply_to option, if set, is not used.
+
+PH/19 When calculating a retry time, Exim used to measure the "time since
+      failure" by looking at the "first failed" field in the retry record. Now
+      it does not use this if it is later than than the arrival time of the
+      message. Instead it uses the arrival time. This makes for better
+      behaviour in cases where some deliveries succeed, thus re-setting the
+      "first failed" field. An example is a quota failure for a huge message
+      when small messages continue to be delivered. Without this change, the
+      "time since failure" will always be short, possible causing more frequent
+      delivery attempts for the huge message than are intended.
+      [Note: This change was subsequently modified - see PH/04 for 4.62.]
+
+PH/20 Added $auth1, $auth2, $auth3 to contain authentication data (as well as
+      $1, $2, $3) because the numerical variables can be reset during some
+      expansion items (e.g. "match"), thereby losing the authentication data.
+
+PH/21 Make -bV show the size of off_t variables so that the test suite can
+      decide whether to run tests for quotas > 2G.
+
+PH/22 Test the values given for quota, quota_filecount, quota_warn_threshold,
+      mailbox_size, and mailbox_filecount in the appendfile transport. If a
+      filecount value is greater than 2G or if a quota value is greater than 2G
+      on a system where the size of off_t is not greater than 4, a panic error
+      is given.
+
+PH/23 When a malformed item such as 1.2.3/24 appears in a host list, it can
+      never match. The debug and -bh output now contains an explicit error
+      message indicating a malformed IPv4 address or mask.
+
+PH/24 An host item such as 1.2.3.4/abc was being treated as the IP address
+      1.2.3.4 without a mask. Now it is not recognized as an IP address, and
+      PH/23 above applies.
+
+PH/25 Do not write to syslog when running in the test harness. The only
+      occasion when this arises is a failure to open the main or panic logs
+      (for which there is an explicit test).
+
+PH/26 Added the /no_tell option to "control=freeze".
+
+PH/27 If a host name lookup failed very early in a connection, for example, if
+      the IP address matched host_lookup and the reverse lookup yielded a name
+      that did not have a forward lookup, an error message of the form "no IP
+      address found for host xxx.xxx.xxx (during SMTP connection from NULL)"
+      could be logged. Now it outputs the IP address instead of "NULL".
+
+PH/28 An enabling patch from MH: add new function child_open_exim2() which
+      allows the sender and the authenticated sender to be set when
+      submitting a message from within Exim. Since child_open_exim() is
+      documented for local_scan(), the new function should be too.
+
+PH/29 In GnuTLS, a forced expansion failure for tls_privatekey was not being
+      ignored. In both GnuTLS and OpenSSL, an expansion of tls_privatekey that
+      results in an empty string is now treated as unset.
+
+PH/30 Fix eximon buffer overflow bug (Bugzilla #73).
+
+PH/31 Added sender_verify_fail logging option.
+
+PH/32 In November 2003, the code in Exim that added an empty Bcc: header when
+      needed by RFC 822 but not by RFC 2822 was commented out. I have now
+      tidied the source and removed it altogether.
+
+PH/33 When a queue run was abandoned because the load average was too high, a
+      log line was always written; now it is written only if the queue_run log
+      selector is set. In addition, the log line for abandonment now contains
+      information about the queue run such as the pid. This is always present
+      in "start" and "stop" lines but was omitted from the "abandon" line.
+
+PH/34 Omit spaces between a header name and the colon in the error message that
+      is given when verify = headers_syntax fails (if there are lots of them,
+      the message gets confusing).
+
+PH/35 Change the default for dns_check_names_pattern to allow slashes within
+      names, as there are now some PTR records that contain slashes. This check
+      is only to protect against broken name servers that fall over on strange
+      characters, so the fact that it applies to all lookups doesn't matter.
+
+PH/36 Now that the new test suite is complete, we can remove some of the
+      special code in Exim that was needed for the old test suite. For example,
+      sorting DNS records because real resolvers return them in an arbitrary
+      order. The new test suite's fake resolver always returns records in the
+      same order.
+
+PH/37 When running in the test harness, use -odi for submitted messages (e.g.
+      bounces) except when queue_only is set, to avoid logging races between
+      the different processes.
+
+PH/38 Panic-die if .include specifies a non-absolute path.
+
+PH/39 A tweak to the "H" retry rule from its user.
+
+JJ/03 exipick: Removed parentheses from 'next' and 'last' calls that specified
+      a label.  They prevented compilation on older perls.
+
+JJ/04 exipick: Refactored code to prevent implicit split to @_ which caused
+      a warning to be raised on newish perls.
+
+JJ/05 exipick: Fixed bug where -bpc always showed a count of all messages
+      on queue.  Changes to match documented behaviour of showing count of
+      messages matching specified criteria.
+
+PH/40 Changed the default ident timeout from 30s to 5s.
+
+PH/41 Added support for the use of login_cap features, on those BSD systems
+      that have them, for controlling the resources used by pipe deliveries.
+
+PH/42 The content-scanning code uses fopen() to create files in which to put
+      message data. Previously it was not paying any attention to the mode of
+      the files. Exim runs with umask(0) because the rest of the code creates
+      files with open(), and sets the required mode explicitly. Thus, these
+      files were ending up world-writeable. This was not a big issue, because,
+      being within the spool directory, they were not world-accessible. I have
+      created a function called modefopen, which takes an additional mode
+      argument. It sets umask(777), creates the file, chmods it to the required
+      mode, then resets the umask. All the relevant calls to fopen() in the
+      content scanning code have been changed to use this function.
+
+PH/43 If retry_interval_max is set greater than 24 hours, it is quietly reset
+      to 24 hours. This avoids potential overflow problems when processing G
+      and H retry rules. I suspect nobody ever tinkers with this value.
+
+PH/44 Added STRIP_COMMAND=/usr/bin/strip to the FreeBSD Makefile.
+
+PH/45 When the plaintext authenticator is running as a client, the server's
+      challenges are checked to ensure they are valid base64 strings. By
+      default, the authentication attempt is cancelled if an invalid string is
+      received. Setting client_ignore_invalid_base64 true ignores these errors.
+      The decoded challenge strings are now placed in $auth1, $auth2, etc. as
+      they are received. Thus, the responses can be made to depend on the
+      challenges. If an invalid string is ignored, an empty string is placed in
+      the variable.
+
+PH/46 Messages that are created by the autoreply transport now contains a
+      References: header, in accordance with RFCs 2822 and 3834.
+
+PH/47 Added authenticated_sender_force to the smtp transport.
+
+PH/48 The ${prvs expansion was broken on systems where time_t was long long.
+
+PH/49 Installed latest patch from the Sieve maintainer.
+
+PH/50 When an Exim quota was set without a file count quota, and mailbox_size
+      was also set, the appendfile transport was unnecessarily scanning a
+      directory of message files (e.g. for maildir delivery) to find the count
+      of files (along with the size), even though it did not need this
+      information. It now does the scan only if it needs to find either the
+      size of the count of files.
+
+PH/51 Added ${time_eval: to convert Exim time strings into seconds.
+
+PH/52 Two bugs concerned with error handling when the smtp transport is
+      used in LMTP mode:
+
+      (i) Exim was not creating retry information for temporary errors given
+      for individual recipients after the DATA command when the smtp transport
+      was used in LMTP mode. This meant that they could be retried too
+      frequently, and not timed out correctly.
+
+      (ii) Exim was setting the flag that allows error details to be returned
+      for LMTP errors on RCPT commands, but not for LMTP errors for individual
+      recipients that were returned after the DATA command.
+
+PH/53 This is related to PH/52, but is more general: for any failing address,
+      when detailed error information was permitted to be returned to the
+      sender, but the error was temporary, then after the final timeout, only
+      "retry timeout exceeded" was returned. Now it returns the full error as
+      well as "retry timeout exceeded".
+
+PH/54 Added control=allow_auth_unadvertised, as it seems there are clients that
+      do this, and (what is worse) MTAs that accept it.
+
+PH/55 Added the add_header modified to ACLs. The use of "message" with "warn"
+      will now be deprecated.
+
+PH/56 New os.c-cygwin from the Cygwin maintainer.
+
+JJ/06 exipick: added --unsorted option to allow unsorted output in all output
+      formats (previously only available in exim formats via -bpr, -bpru,
+      and -bpra.  Now also available in native and exiqgrep formats)
+
+JJ/07 exipick: added --freeze and --thaw options to allow faster interaction
+      with very large, slow to parse queues
+
+JJ/08 exipick: added ! as generic prefix to negate any criteria format
+
+JJ/09 exipick: miscellaneous performance enhancements (~24% improvements)
+
+PH/57 Tidies in SMTP dialogue display in debug output: (i) It was not showing
+      responses to authentication challenges, though it was showing the
+      challenges; (ii) I've removed the CR characters from the debug output for
+      SMTP output lines.
+
+PH/58 Allow for the insertion of a newline as well as a space when a string
+      is turned into more than one encoded-word during RFC 2047 encoding. The
+      Sieve code now uses this.
+
+PH/59 Added the following errors that can be detected in retry rules: mail_4xx,
+      data_4xx, lost_connection, tls_required.
+
+PH/60 When a VRFY deferred or FAILED, the log message rather than the user
+      message was being sent as an SMTP response.
+
+PH/61 Add -l and -k options to exicyclog.
+
+PH/62 When verifying, if an address was redirected to one new address, so that
+      verification continued, and the new address failed or deferred after
+      having set something in $address_data, the value of $address_data was not
+      passed back to the ACL. This was different to the case when no
+      redirection occurred. The value is now passed back in both cases.
+
+PH/63 Changed the macro HAVE_LOGIN_CAP (see PH/41 for this release above) to
+      HAVE_SETCLASSRESOURCES because there are different APIs in use that all
+      use login_cap.h, so on its own it isn't the distinguishing feature. The
+      new name refers directly to the setclassresources() function.
+
+PH/65 Added configuration files for NetBSD3.
+
+PH/66 Updated OS/Makefile-HP-UX for gcc 4.1.0 with HP-UX 11.
+
+PH/67 Fixed minor infelicity in the sorting of addresses to ensure that IPv6
+      is preferred over IPv4.
+
+PH/68 The bounce_return_message and bounce_return_body options were not being
+      honoured for bounces generated during the reception of non-SMTP messages.
+      In particular, this applied to messages rejected by the ACL. This bug has
+      been fixed. However, if bounce_return_message is true and bounce_return_
+      body is false, the headers that are returned for a non-SMTP message
+      include only those that have been read before the error was detected.
+      (In the case of an ACL rejection, they have all been read.)
+
+PH/69 The HTML version of the specification is now built in a directory called
+      spec_html instead of spec.html, because the latter looks like a path with
+      a MIME-type, and this confuses some software.
+
+PH/70 Catch two compiler warnings in sieve.c.
+
+PH/71 Fixed an obscure and subtle bug (thanks Alexander & Matthias). The
+      function verify_get_ident() calls ip_connect() to connect a socket, but
+      if the "connect()" function timed out, ip_connect() used to close the
+      socket. However, verify_get_ident() also closes the socket later, and in
+      between Exim writes to the log, which may get opened at this point. When
+      the socket was closed in ip_connect(), the log could get the same file
+      descriptor number as the socket. This naturally causes chaos. The fix is
+      not to close the socket in ip_connect(); the socket should be closed by
+      the function that creates it. There was only one place in the code where
+      this was missing, in the iplookup router, which I don't think anybody now
+      uses, but I've fixed it anyway.
+
+PH/72 Make dns_again_means_nonexist apply to lookups using gethostbyname() as
+      well as to direct DNS lookups. Otherwise the handling of names in host
+      lists is inconsistent and therefore confusing.
+
+
+Exim version 4.60
+-----------------
+
+PH/01 Two changes to the default runtime configuration:
+
+      (1) Move the checks for relay_from_hosts and authenticated clients from
+          after to before the (commented out) DNS black list checks.
+
+      (2) Add control=submission to the relay_from_hosts and authenticated
+          clients checks, on the grounds that messages accepted by these
+          statements are most likely to be submissions.
+
+PH/02 Several tidies to the handling of ${prvs and ${prvscheck:
+
+      (1) Generate an error if the third argument for the ${prvs expansion is
+          not a single digit.
+
+      (2) Treat a missing third argument of ${prvscheck as if it were an empty
+          string.
+
+      (3) Reset the variables that are obtained from the first argument of
+          ${prvscheck and used in the second argument before leaving the code,
+          because their memory is reclaimed, so using them afterwards may do
+          silly things.
+
+      (4) Tidy up the code for expanding the arguments of ${prvscheck one by
+          one (it's much easier than Tom thought :-).
+
+      (5) Because of (4), we can now allow for the use of $prvscheck_result
+          inside the third argument.
+
+PH/03 For some reason, the default setting of PATH when running a command from
+      a pipe transport was just "/usr/bin". I have changed it to
+      "/bin:/usr/bin".
+
+PH/04 SUPPORT_TRANSLATE_IP_ADDRESS and MOVE_FROZEN_MESSAGES did not cause
+      anything to be listed in the output from -bV.
+
+PH/05 When a filter generated an autoreply, the entire To: header line was
+      quoted in the delivery log line, like this:
+
+        => >A.N.Other <ano@some.domain> <original@ddress> ...
+
+      This has been changed so that it extracts the operative address. There
+      may be more than one such address. If so, they are comma-separated, like
+      this:
+
+        => >ano@some.domain,ona@other.domain <original@ddress> ...
+
+PH/06 When a client host used a correct literal IP address in a HELO or EHLO
+      command, (for example, EHLO [1.2.3.4]) and the client's IP address was
+      not being looked up in the rDNS to get a host name, Exim was showing the
+      IP address twice in Received: lines, even though the IP addresses were
+      identical. For example:
+
+        Received: from [1.2.3.4] (helo=[1.2.3.4])
+
+      However, if the real host name was known, it was omitting the HELO data
+      if it matched the actual IP address. This has been tidied up so that it
+      doesn't show the same IP address twice.
+
+PH/07 When both +timestamp and +memory debugging was on, the value given by
+      $tod_xxx expansions could be wrong, because the tod_stamp() function was
+      called by the debug printing, thereby overwriting the timestamp buffer.
+      Debugging no longer uses the tod_stamp() function when +timestamp is set.
+
+PH/08 When the original message was included in an autoreply transport, it
+      always said "this is a copy of the message, including all the headers",
+      even if body_only or headers_only was set. It now gives an appropriate
+      message.
+
+PH/09 Applied a patch from the Sieve maintainer which:
+
+      o  fixes some comments
+      o  adds the (disabled) notify extension core
+      o  adds some debug output for the result of if/elsif tests
+      o  points to the current vacation draft in the documentation
+         and documents the missing references header update
+
+      and most important:
+
+      o  fixes a bug in processing the envelope test (when testing
+         multiple envelope elements, the last element determinted the
+         result)
+
+PH/10 Exim was violating RFC 3834 ("Recommendations for Automatic Responses to
+      Electronic Mail") by including:
+
+        Auto-submitted: auto-generated
+
+      in the messages that it generates (bounce messages and others, such as
+      warnings). In the case of bounce messages for non-SMTP mesages, there was
+      also a typo: it was using "Auto_submitted" (underscore instead of
+      hyphen). Since every message generated by Exim is necessarily in response
+      to another message, thes have all been changed to:
+
+        Auto-Submitted: auto-replied
+
+      in accordance with these statements in the RFC:
+
+        The auto-replied keyword:
+
+        -  SHOULD be used on messages sent in direct response to another
+           message by an automatic process,
+
+        -  MUST NOT be used on manually-generated messages,
+
+        -  MAY be used on Delivery Status Notifications (DSNs) and Message
+           Disposition Notifications (MDNs),
+
+        -  MUST NOT be used on messages generated by automatic or periodic
+           processes, except for messages which are automatic responses to
+           other messages.
+
+PH/11 Added "${if def:sender_address {(envelope-from <$sender_address>)\n\t}}"
+      to the default Received: header definition.
+
+PH/12 Added log selector acl_warn_skipped (default on).
+
+PH/13 After a successful wildlsearch lookup, discard the values of numeric
+      variables because (a) they are in the wrong storage pool and (b) even if
+      they were copied, it wouldn't work properly because of the caching.
+
+PH/14 Add check_rfc2047_length to disable enforcement of RFC 2047 length
+      checking when decoding. Apparently there are clients that generate
+      overlong encoded strings. Why am I not surprised?
+
+PH/15 If the first argument of "${if match_address" was not empty, but did not
+      contain an "@" character, Exim crashed. Now it writes a panic log message
+      and treats the condition as false.
+
+PH/16 In autoreply, treat an empty string for "once" the same as unset.
+
+PH/17 A further patch from the Sieve maintainer: "Introduce the new Sieve
+      extension "envelope-auth".  The code is finished and in agreement with
+      other implementations, but there is no documentation so far and in fact,
+      nobody wrote the draft yet.  This extension is currently #undef'ed, thus
+      not changing the active code.
+
+      Print executed "if" and "elsif" statements when debugging is used. This
+      helps a great deal to understand what a filter does.
+
+      Document more things not specified clearly in RFC3028.  I had all this
+      sorted out, when out of a sudden new issues came to my mind.  Oops."
+
+PH/18 Exim was not recognizing the "net-" search type prefix in match_ip lists
+      (Bugzilla #53).
+
+PH/19 Exim expands the IPv6 address given to -bh to its full non-abbreviated
+      canonical form (as documented). However, after a host name lookup from
+      the IP address, check_host() was doing a simple string comparison with
+      addresses acquired from the DNS when checking that the found name did
+      have the original IP as one of its addresses. Since any found IPv6
+      addresses are likely to be in abbreviated form, the comparison could
+      fail. Luckily, there already exists a function for doing the comparison
+      by converting both addresses to binary, so now that is used instead of
+      the text comparison.
+
+PH/20 There was another similar case to PH/19, when a complete host name was
+      given in a host list; looking up its IP address could give an abbreviated
+      form, whereas the current host's name might or might not be abbreviated.
+      The same fix has been applied.
+
+
+Exim version 4.54
+-----------------
+
+PH/01 The ${base62: operator adjusted itself to base 36 when BASE_62 was
+      set to 36 (for Darwin and Cygwin), but the ${base62d: operator did not.
+      It now does.
+
+PH/02 Two minor problems detected in Cygwin: the os.{c,h} files had lost */ on
+      the CVS lines, and there was a missing #if HAVE_IPV6 in host.c.
+
+PH/03 Typo: missing ".o" in src/pcre/Makefile.
+
+PH/04 Tighten up "personal" tests: Instead of testing for any "List-"
+      header line, restrict the check to what is listed in RFCs 2369 and 2929.
+      Also, for "Auto-Submitted", treat anything other than "no" as
+      non-personal, in accordance with RFC 3834. (Previously it treated
+      anything starting "auto-" as non-personal.)
+
+TF/01 The control=submission/name=... option had a problem with syntax
+      errors if the name included a slash character. The /name= option
+      now slurps the rest of the string, so it can include any characters
+      but it must come last in the list of options (after /sender_retain
+      or /domain=).
+
+PH/05 Some modifications to the interface to the fake nameserver for the new
+      testing suite.
+
+
+
 Exim version 4.53
 -----------------
 
@@ -50,6 +1580,180 @@ PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
       lookups in the parent process. There should also be a search_tidyup() at
       the end of the subprocess.
 
+PH/13 Previously, if "verify = helo" was set in an ACL, the condition was true
+      only if the host matched helo_try_verify_hosts, which caused the
+      verification to occur when the EHLO/HELO command was issued. The ACL just
+      tested the remembered result. Now, if a previous verification attempt has
+      not happened, "verify = helo" does it there and then.
+
+JJ/01 exipick: added $message_exim_id variable (see 4.53-PH/04)
+
+TK/03 Fix log output including CR from clamd.
+
+PH/14 A reference to $reply_address when Reply-to: was empty and From: did not
+      exist provoked a memory error which could cause a segfault.
+
+PH/15 Installed PCRE 6.2
+
+PH/17 Defined BIND_8_COMPAT in the Darwin os.h file.
+
+PH/18 Reversed 4.52/PH/17 because the HP-UX user found it wasn't the cause
+      of the problem. Specifically, suggested +O2 rather than +O1 for the
+      HP-UX compiler.
+
+PH/19 Added sqlite_lock_timeout option (David Woodhouse's patch).
+
+PH/20 If a delivery was routed to a non-standard port by means of an SRV
+      record, the port was not correctly logged when the outgoing_port log
+      selector was set (it logged the transort's default port).
+
+PH/21 Added support for host-specific ports to manualroute, queryprogram,
+      fallback_hosts, and "hosts" in the smtp transport.
+
+PH/22 If the log selector "outgoing_port" is set, the port is now also given on
+      host errors such as "Connection refused".
+
+PH/23 Applied a patch to fix problems with exim-4.52 while doing radius
+      authentication with radiusclient 0.4.9:
+
+      - Error returned from rc_read_config was caught wrongly
+      - Username/password not passed on to radius server due to wrong length.
+
+      The presumption is that some radiusclient API changes for 4.51/PH/17
+      were not taken care of correctly. The code is still untested by me (my
+      Linux distribution still has 0.3.2 of radiusclient), but it was
+      contributed by a Radius user.
+
+PH/24 When doing a callout, the value of $domain wasn't set correctly when
+      expanding the "port" option of the smtp transport.
+
+TK/04 MIME ACL: Fix buffer underrun that occurs when EOF condition is met
+      while reading a MIME header. Thanks to Tom Hughes for a patch.
+
+PH/24 Include config.h inside local_scan.h so that configuration settings are
+      available.
+
+PH/25 Make $smtp_command_argument available after all SMTP commands. This means
+      that in an ACL for RCPT (for example), you can examine exactly what was
+      received.
+
+PH/26 Exim was recognizing IPv6 addresses of the form [IPv6:....] in EHLO
+      commands, but it was not correctly comparing the address with the actual
+      client host address. Thus, it would show the EHLO address in Received:
+      header lines when this was not necessary.
+
+PH/27 Added the % operator to ${eval:}.
+
+PH/28 Exim tries to create and chdir to its spool directory when it starts;
+      it should be ignoring failures (because with -C, for example, it has lost
+      privilege). It wasn't ignoring creation failures other than "already
+      exists".
+
+PH/29 Added "crypteq" to the list of supported features that Exim outputs when
+      -bV or -d is used.
+
+PH/30 Fixed (presumably very longstanding) bug in exim_dbmbuild: if it failed
+      because an input line was too long, either on its own, or by virtue of
+      too many continuations, the temporary file was not being removed, and the
+      return code was incorrect.
+
+PH/31 Missing "BOOL" in function definition in filtertest.c.
+
+PH/32 Applied Sieve patches from the maintainer.
+
+TK/05 Domainkeys: Accomodate for a minor API change in libdomainkeys 0.67.
+
+PH/33 Added "verify = not_blind".
+
+PH/34 There are settings for CHOWN_COMMAND and MV_COMMAND that can be used in
+      Local/Makefile (with some defaults set). These are used in built scripts
+      such as exicyclog, but they have never been used in the exim_install
+      script (though there are many overriding facilities there). I have
+      arranged that the exim_install script now takes note of these two
+      settings.
+
+PH/35 Installed configuration files for Dragonfly.
+
+PH/36 When a locally submitted message by a trusted user did not contain a
+      From: header, and the sender address was obtained from -f or from an SMTP
+      MAIL command, and the trusted user did not use -F to supply a sender
+      name, $originator_name was incorrectly used when constructing a From:
+      header. Furthermore, $originator_name was used for submission mode
+      messages from external hosts without From: headers in a similar way,
+      which is clearly wrong.
+
+PH/37 Added control=suppress_local_fixups.
+
+PH/38 When log_selector = +received_sender was set, and the addition of the
+      sender made the log line's construction buffer exactly full, or one byte
+      less than full, an overflow happened when the terminating "\n" was
+      subsequently added.
+
+PH/39 Added a new log selector, "unknown_in_list", which provokes a log entry
+      when the result of a list match is failure because a DNS lookup failed.
+
+PH/40 RM_COMMAND is now used in the building process.
+
+PH/41 Added a "distclean" target to the top-level Makefile; it deletes all
+      the "build-* directories that it finds.
+
+PH/42 (But a TF fix): In a domain list, Exim incorrectly matched @[] if the IP
+      address in a domain literal was a prefix of an interface address.
+
+PH/43 (Again a TF fix): In the dnslookup router, do not apply widen_domains
+      when verifying a sender address, unless rewrite_headers is false.
+
+PH/44 Wrote a long comment about why errors_to addresses are verified as
+      recipients, not senders.
+
+TF/01 Add missing LIBS=-lm to OS/Makefile-OpenBSD which was overlooked when
+      the ratelimit ACL was added.
+
+PH/45 Added $smtp_command for the full command (cf $smtp_command_argument).
+
+PH/46 Added extra information about PostgreSQL errors to the error string.
+
+PH/47 Added an interface to a fake DNS resolver for use by the new test suite,
+      avoiding the need to install special zones in a real server. This is
+      backwards compatible; if it can't find the fake resolver, it drops back.
+      Thus, both old and new test suites can be run.
+
+TF/02 Added util/ratelimit.pl
+
+TF/03 Minor fix to the ratelimit code to improve its behaviour in case the
+      clock is set back in time.
+
+TF/04 Fix the ratelimit support in exim_fixdb. Patch provided by Brian
+      Candler <B.Candler@pobox.com>.
+
+TF/05 The fix for PH/43 was not completely correct; widen_domains is always
+      OK for addresses that are the result of redirections.
+
+PH/48 A number of further additions for the benefit of the new test suite,
+      including a fake gethostbyname() that interfaces to the fake DNS resolver
+      (see PH/47 above).
+
+TF/06 The fix for widen_domains has also been applied to qualify_single and
+      search_parents which are the other dnslookup options that can cause
+      header rewrites.
+
+PH/49 Michael Haardt's randomized retrying, but as a separate retry parameter
+      type ("H").
+
+PH/50 Make never_users, trusted_users, admin_groups, trusted_groups expandable.
+
+TF/07 Exim produced the error message "an SRV record indicated no SMTP
+      service" if it encountered an MX record with an empty target hostname.
+      The message is now "an MX or SRV record indicated no SMTP service".
+
+TF/08 Change PH/13 introduced the possibility that verify=helo may defer,
+      if the DNS of the sending site is misconfigured. This is quite a
+      common situation. This change restores the behaviour of treating a
+      helo verification defer as a failure.
+
+PH/51 If self=fail was set on a router, the bounce message did not include the
+      actual error message.
+
 
 Exim version 4.52
 -----------------