Adding upstream version 4.92.upstream/4.92upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 7368 insertions, 0 deletions

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+Change log file for Exim from version 4.21
+------------------------------------------
+This document describes *changes* to previous versions, that might
+affect Exim's operation, with an unchanged configuration file.  For new
+options, and new features, see the NewStuff file next to this ChangeLog.
+
+
+Exim version 4.92
+-----------------
+
+JH/01 Remove code calling the customisable local_scan function, unless a new
+      definition "HAVE_LOCAL_SCAN=yes" is present in the Local/Makefile.
+
+JH/02 Bug 1007: Avoid doing logging from signal-handlers, as that can result in
+      non-signal-safe functions being used.
+
+JH/03 Bug 2269: When presented with a received message having a stupidly large
+      number of DKIM-Signature headers, disable DKIM verification to avoid
+      a resource-consumption attack.  The limit is set at twenty.
+
+JH/04 Add variables $arc_domains, $arc_oldest_pass for ARC verify.  Fix the
+      report of oldest_pass in ${authres } in consequence, and separate out
+      some descriptions of reasons for verification fail.
+
+JH/05 Bug 2273: Cutthrough delivery left a window where the received messsage
+      files in the spool were present and unlocked.  A queue-runner could spot
+      them, resulting in a duplicate delivery.  Fix that by doing the unlock
+      after the unlink.  Investigation by Tim Stewart.  Take the opportunity to
+      add more error-checking on spoolfile handling while that code is being
+      messed with.
+
+PP/01 Refuse to open a spool data file (*-D) if it's a symlink.
+      No known attacks, no CVE, this is defensive hardening.
+
+JH/06 Bug 2275: The MIME ACL unlocked the received message files early, and
+      a queue-runner could start a delivery while other operations were ongoing.
+      Cutthrough delivery was a common victim, resulting in duplicate delivery.
+      Found and investigated by Tim Stewart.  Fix by using the open message data
+      file handle rather than opening another, and not locally closing it (which
+      releases a lock) for that case, while creating the temporary .eml format
+      file for the MIME ACL.  Also applies to "regex" and "spam" ACL conditions.
+
+JH/07 Bug 177: Make a random-recipient callout success visible in ACL, by setting
+      $sender_verify_failure/$recipient_verify_failure to "random".
+
+JH/08 When generating a selfsigned cert, use serial number 1 since zero is not
+      legitimate.
+
+JH/09 Bug 2274: Fix logging of cmdline args when starting in an unlinked cwd.
+      Previously this would segfault.
+
+JH/10 Fix ARC signing for case when DKIM signing failed.  Previously this would
+      segfault.
+
+JH/11 Bug 2264: Exim now only follows CNAME chains one step by default. We'd
+      like zero, since the resolver should be doing this for us, But we need one
+      as a CNAME but no MX presence gets the CNAME returned; we need to check
+      that doesn't point to an MX to declare it "no MX returned" rather than
+      "error, loop".  A new main option is added so the older capability of
+      following some limited number of chain links is maintained.
+
+JH/12 Add client-ip info to non-pass iprev ${authres } lines.
+
+JH/13 For receent Openssl versions (1.1 onward) use modern generic protocol
+      methods.  These should support TLS 1.3; they arrived with TLS 1.3 and the
+      now-deprecated earlier definitions used only specified the range up to TLS
+      1.2 (in the older-version library docs).
+
+JH/14 Bug 2284: Fix DKIM signing for body lines starting with a pair of dots.
+
+JH/15 Rework TLS client-side context management.  Stop using a global, and
+      explicitly pass a context around.  This enables future use of TLS for
+      connections to service-daemons (eg. malware scanning) while a client smtp
+      connection is using TLS; with cutthrough connections this is quite likely.
+
+JH/16 Fix ARC verification to do AS checks in reverse order.
+
+JH/17 Support a "tls" option on the ${readsocket } expansion item.
+
+JH/18 Bug 2287: Fix the protocol name (eg utf8esmtp) for multiple messages
+      using the SMTPUTF8 option on their MAIL FROM commands, in one connection.
+      Previously the "utf8" would be re-prepended for every additional message.
+
+JH/19 Reject MAIL FROM commands with SMTPUTF8 when the facility was not advertised.
+      Previously thery were accepted, resulting in issues when attempting to
+      forward messages to a non-supporting MTA.
+
+PP/02 Let -n work with printing macros too, not just options.
+
+JH/20 Bug 2296: Fix cutthrough for >1 address redirection.  Previously only
+      one parent address was copied, and bogus data was used at delivery-logging
+      time.  Either a crash (after delivery) or bogus log data could result.
+      Discovery and analysis by Tim Stewart.
+
+PP/03 Make ${utf8clean:} expansion operator detect incomplete final character.
+      Previously if the string ended mid-character, we did not insert the
+      promised '?' replacement.
+
+PP/04 Documentation: current string operators work on bytes, not codepoints.
+
+JH/21 Change as many as possible of the global flags into one-bit bitfields; these
+      should pack well giving a smaller memory footprint so better caching and
+      therefore performance.  Group the declarations where this can't be done so
+      that the byte-sized flag variables are not interspersed among pointer
+      variables, giving a better chance of good packing by the compiler.
+
+JH/22 Bug 1896: Fix the envelope from for DMARC forensic reports to be possibly
+      non-null, to avoid issues with sites running BATV.  Previously reports were
+      sent with an empty envelope sender so looked like bounces.
+
+JH/23 Bug 2318: Fix the noerror command within filters.  It wasn't working.
+      The ignore_error flag wasn't being returned from the filter subprocess so
+      was not set for later routers.  Investigation and fix by Matthias Kurz.
+
+JH/24 Bug 2310: Raise a msg:fail:internal event for each undelivered recipient,
+      and a msg:complete for the whole, when a message is manually removed using
+      -Mrm.  Developement by Matthias Kurz, hacked on by JH.
+
+JH/25 Avoid fixed-size buffers for pathnames in DB access.  This required using
+      a "Gnu special" function, asprintf() in the DB utility binary builds; I
+      hope that is portable enough.
+
+JH/26 Bug 2311: Fix DANE-TA verification under GnuTLS.  Previously it was also
+      requiring a known-CA anchor certificate; make it now rely entirely on the
+      TLSA as an anchor.  Checking the name on the leaf cert against the name
+      on the A-record for the host is still done for TA (but not for EE mode).
+
+JH/27 Fix logging of proxy address.  Previously, a pointless "PRX=[]:0" would be
+      included in delivery lines for non-proxied connections, when compiled with
+      SUPPORT_SOCKS and running with proxy logging enabled.
+
+JH/28 Bug 2314: Fire msg:fail:delivery event even when error is being ignored.
+      Developement by Matthias Kurz, tweaked by JH.  While in that bit of code,
+      move the existing event to fire before the normal logging of message
+      failure so that custom logging is bracketed by normal logging.
+
+JH/29 Bug 2322: A "fail" command in a non-system filter (file) now fires the
+      msg:fail:internal event.  Developement by Matthias Kurz.
+
+JH/30 Bug 2329: Increase buffer size used for dns lookup from 2k, which was
+      far too small for todays use of crypto signatures stored there.  Go all
+      the way to the max DNS message size of 64kB, even though this might be
+      overmuch for IOT constrained device use.
+
+JH/31 Fix a bad use of a copy function, which could be used to pointlessly
+      copy a string over itself.  The library routine is documented as not
+      supporting overlapping copies, and on MacOS it actually raised a SIGABRT.
+
+JH/32 For main options check_spool_space and check_inode_space, where the
+      platform supports 64b integers, support more than the previous 2^31 kB
+      (i.e. more than 2 TB).  Accept E, P and T multipliers in addition to
+      the previous G, M, k.
+
+JH/33 Bug 2338: Fix the cyrus-sasl authenticator to fill in the
+      $authenticated_fail_id variable on authentication failure.  Previously
+      it was unset.
+
+JH/34 Increase RSA keysize of autogen selfsign cert from 1024 to 2048.  RHEL 8.0
+      OpenSSL didn't want to use such a weak key.  Do for GnuTLS also, and for
+      more-modern GnuTLS move from GNUTLS_SEC_PARAM_LOW to
+      GNUTLS_SEC_PARAM_MEDIUM.
+
+JH/35 OpenSSL: fail the handshake when SNI processing hits a problem, server
+      side.  Previously we would continue as if no SNI had been received.
+
+JH/36 Harden the handling of string-lists.  When a list consisted of a sole
+      "<" character, which should be a list-separator specification, we walked
+      off past the nul-terimation.
+
+JH/37 Bug 2341: Send "message delayed" warning MDNs (restricted to external
+      causes) even when the retry time is not yet met.  Previously they were
+      not, meaning that when (say) an account was over-quota and temp-rejecting,
+      and multiple senders' messages were queued, only one sender would get
+      notified on each configured delay_warning cycle.
+
+JH/38 Bug 2351: Log failures to extract envelope addresses from message headers.
+
+JH/39 OpenSSL: clear the error stack after an SSL_accept().  With anon-auth
+      cipher-suites, an error can be left on the stack even for a succeeding
+      accept; this results in impossible error messages when a later operation
+      actually does fail.
+
+AM/01 Bug 2359: GnuTLS: repeat lowlevel read and write operations while they
+      return error codes indicating retry.  Under TLS1.3 this becomes required.
+
+JH/40 Fix the feature-cache refresh for EXPERIMENTAL_PIPE_CONNECT.  Previously
+      it only wrote the new authenticators, resulting in a lack of tracking of
+      peer changes of ESMTP extensions until the next cache flush.
+
+JH/41 Fix the loop reading a message header line to check for integer overflow,
+      and more-often against header_maxsize.  Previously a crafted message could
+      induce a crash of the recive process; now the message is cleanly rejected.
+
+JH/42 Bug 2366: Fix the behaviour of the dkim_verify_signers option.  It had
+      been totally disabled for all of 4.91.  Discovery and fix by "Mad Alex".
+
+
+Exim version 4.91
+-----------------
+
+GF/01 DEFER rather than ERROR on redis cluster MOVED response.
+      When redis_servers is set to a list of > 1 element, and the Redis servers
+      in that list are in cluster configuration, convert the REDIS_REPLY_ERROR
+      case of MOVED into a DEFER case instead, thus moving the query onto the
+      next server in the list. For a cluster of N elements, all N servers must
+      be defined in redis_servers.
+
+GF/02 Catch and remove uninitialized value warning in exiqsumm
+      Check for existence of @ARGV before looking at $ARGV[0]
+
+JH/01 Replace the store_release() internal interface with store_newblock(),
+      which internalises the check required to safely use the old one, plus
+      the allocate and data copy operations duplicated in both (!) of the
+      extant use locations.
+
+JH/02 Disallow '/' characters in queue names specified for the "queue=" ACL
+      modifier.  This matches the restriction on the commandline.
+
+JH/03 Fix pgsql lookup for multiple result-tuples with a single column.
+      Previously only the last row was returned.
+
+JH/04 Bug 2217: Tighten up the parsing of DKIM signature headers. Previously
+      we assumed that tags in the header were well-formed, and parsed the
+      element content after inspecting only the first char of the tag.
+      Assumptions at that stage could crash the receive process on malformed
+      input.
+
+JH/05 Bug 2215: Fix crash associated with dnsdb lookup done from DKIM ACL.
+      While running the DKIM ACL we operate on the Permanent memory pool so that
+      variables created with "set" persist to the DATA ACL.  Also (at any time)
+      DNS lookups that fail create cache records using the Permanent pool.  But
+      expansions release any allocations made on the current pool - so a dnsdb
+      lookup expansion done in the DKIM ACL releases the memory used for the
+      DNS negative-cache, and bad things result.  Solution is to switch to the
+      Main pool for expansions.
+      While we're in that code, add checks on the DNS cache during store_reset,
+      active in the testsuite.
+      Problem spotted, and debugging aided, by Wolfgang Breyha.
+
+JH/06 Fix issue with continued-connections when the DNS shifts unreliably.
+      When none of the hosts presented to a transport match an already-open
+      connection, close it and proceed with the list.  Previously we would
+      queue the message.  Spotted by Lena with Yahoo, probably involving
+      round-robin DNS.
+
+JH/07 Bug 2214: Fix SMTP responses resulting from non-accept result of MIME ACL.
+      Previously a spurious "250 OK id=" response was appended to the proper
+      failure response.
+
+JH/08 The "support for" informational output now, which built with Content
+      Scanning support, has a line for the malware scanner interfaces compiled
+      in.  Interface can be individually included or not at build time.
+
+JH/09 The "aveserver", "kavdaemon" and "mksd" interfaces are now not included
+      by the template makefile "src/EDITME".  The "STREAM" support for an older
+      ClamAV interface method is removed.
+
+JH/10 Bug 2223: Fix mysql lookup returns for the no-data case (when the number of
+      rows affected is given instead).
+
+JH/11 The runtime Berkeley DB library version is now additionally output by
+      "exim -d -bV".  Previously only the compile-time version was shown.
+
+JH/12 Bug 2230: Fix cutthrough routing for nonfirst messages in an initiating
+      SMTP connection.  Previously, when one had more receipients than the
+      first, an abortive onward connection was made.  Move to full support for
+      multiple onward connections in sequence, handling cutthrough connection
+      for all multi-message initiating connections.
+
+JH/13 Bug 2229: Fix cutthrough routing for nonstandard port numbers defined by
+      routers.  Previously, a multi-recipient message would fail to match the
+      onward-connection opened for the first recipient, and cause its closure.
+
+JH/14 Bug 2174: A timeout on connect for a callout was also erroneously seen as
+      a timeout on read on a GnuTLS initiating connection, resulting in the
+      initiating connection being dropped.  This mattered most when the callout
+      was marked defer_ok.  Fix to keep the two timeout-detection methods
+      separate.
+
+JH/15 Relax results from ACL control request to enable cutthrough, in
+      unsupported situations, from error to silently (except under debug)
+      ignoring.  This covers use with PRDR, frozen messages, queue-only and
+      fake-reject.
+
+HS/01 Fix Buffer overflow in base64d() (CVE-2018-6789)
+
+JH/16 Fix bug in DKIM verify: a buffer overflow could corrupt the malloc
+      metadata, resulting in a crash in free().
+
+PP/01 Fix broken Heimdal GSSAPI authenticator integration.
+      Broken in f2ed27cf5, missing an equals sign for specified-initialisers.
+      Broken also in d185889f4, with init system revamp.
+
+JH/17 Bug 2113: Fix conversation closedown with the Avast malware scanner.
+      Previously we abruptly closed the connection after reading a malware-
+      found indication; now we go on to read the "scan ok" response line,
+      and send a quit.
+
+JH/18 Bug 2239: Enforce non-usability of control=utf8_downconvert in the mail
+      ACL.  Previously, a crash would result.
+
+JH/19 Speed up macro lookups during configuration file read, by skipping non-
+      macro text after a replacement (previously it was only once per line) and
+      by skipping builtin macros when searching for an uppercase lead character.
+
+JH/20 DANE support moved from Experimental to mainline.  The Makefile control
+      for the build is renamed.
+
+JH/21 Fix memory leak during multi-message connections using STARTTLS.  A buffer
+      was allocated for every new TLS startup, meaning one per message.  Fix
+      by only allocating once (OpenSSL) or freeing on TLS-close (GnuTLS).
+
+JH/22 Bug 2236: When a DKIM verification result is overridden by ACL, DMARC
+      reported the original.  Fix to report (as far as possible) the ACL
+      result replacing the original.
+
+JH/23 Fix memory leak during multi-message connections using STARTTLS under
+      OpenSSL.  Certificate information is loaded for every new TLS startup,
+      and the resources needed to be freed.
+
+JH/24 Bug 2242: Fix exim_dbmbuild to permit directoryless filenames.
+
+JH/25 Fix utf8_downconvert propagation through a redirect router.  Previously it
+      was not propagated.
+
+JH/26 Bug 2253: For logging delivery lines under PRDR, append the overall
+      DATA response info to the (existing) per-recipient response info for
+      the "C=" log element.  It can have useful tracking info from the
+      destination system.  Patch from Simon Arlott.
+
+JH/27 Bug 2251: Fix ldap lookups that return a single attribute having zero-
+      length value.  Previously this would segfault.
+
+HS/02 Support Avast multiline protoocol, this allows passing flags to
+      newer versions of the scanner.
+
+JH/28 Ensure that variables possibly set during message acceptance are marked
+      dead before release of memory in the daemon loop.  This stops complaints
+      about them when the debug_store option is enabled.  Discovered specifically
+      for sender_rate_period, but applies to a whole set of variables.
+      Do the same for the queue-runner and queue-list loops, for variables set
+      from spool message files.  Do the same for the SMTP per-message loop, for
+      certain variables indirectly set in ACL operations.
+
+JH/29 Bug 2250: Fix a longstanding bug in heavily-pipelined SMTP input (such
+      as a multi-recipient message from a mailinglist manager).  The coding had
+      an arbitrary cutoff number of characters while checking for more input;
+      enforced by writing a NUL into the buffer.  This corrupted long / fast
+      input.   The problem was exposed more widely when more pipelineing of SMTP
+      responses was introduced, and one Exim system was feeding another.
+      The symptom is log complaints of SMTP syntax error (NUL chars) on the
+      receiving system, and refused recipients seen by the sending system
+      (propating to people being dropped from mailing lists).
+      Discovered and pinpointed by David Carter.
+
+JH/30 The (EXPERIMENTAL_DMARC) variable $dmarc_ar_header is withdrawn, being
+      replaced by the ${authresults } expansion.
+
+JH/31 Bug 2257: Fix pipe transport to not use a socket-only syscall.
+
+HS/03 Set a handler for SIGTERM and call exit(3) if running as PID 1. This
+      allows proper process termination in container environments.
+
+JH/32 Bug 2258: Fix spool_wireformat in combination with LMTP transport.
+      Previously the "final dot" had a newline after it; ensure it is CR,LF.
+
+JH/33 SPF: remove support for the "spf" ACL condition outcome values "err_temp"
+      and "err_perm", deprecated since 4.83 when the RFC-defined words
+      "temperror" and "permerror" were introduced.
+
+JH/34 Re-introduce enforcement of no cutthrough delivery on transports having
+      transport-filters or DKIM-signing.  The restriction was lost in the
+      consolidation of verify-callout and delivery SMTP handling.
+      Extend the restriction to also cover ARC-signing.
+
+JH/35 Cutthrough: for a final-dot response timeout (and nonunderstood responses)
+      in defer=pass mode supply a 450 to the initiator.  Previously the message
+      would be spooled.
+
+PP/02 DANE: add dane_require_tls_ciphers SMTP Transport option; if unset,
+      tls_require_ciphers is used as before.
+
+HS/03 Malware Avast: Better match the Avast multiline protocol. Add
+      "pass_unscanned".  Only tmpfails from the scanner are written to
+      the paniclog, as they may require admin intervention (permission
+      denied, license issues). Other scanner errors (like decompression
+      bombs) do not cause a paniclog entry.
+
+JH/36 Fix reinitialisation of DKIM logging variable between messages.
+      Previously it was possible to log spurious information in receive log
+      lines.
+
+JH/37 Bug 2255: Revert the disable of the OpenSSL session caching.  This
+      triggered odd behaviour from Outlook Express clients.
+
+PP/03 Add util/renew-opendmarc-tlds.sh script for safe renewal of public
+      suffix list.
+
+JH/38 DKIM: accept Ed25519 pubkeys in SubjectPublicKeyInfo-wrapped form,
+      since the IETF WG has not yet settled on that versus the original
+      "bare" representation.
+
+JH/39 Fix syslog logging for syslog_timestamp=no and log_selector +millisec.
+      Previously the millisecond value corrupted the output.
+      Fix also for syslog_pid=no and log_selector +pid, for which the pid
+      corrupted the output.
+
+
+Exim version 4.90
+-----------------
+
+JH/01 Rework error string handling in TLS interface so that the caller in
+      more cases is responsible for logging.  This permits library-sourced
+      string to be attached to addresses during delivery, and collapses
+      pairs of long lines into single ones.
+
+PP/01 Allow PKG_CONFIG_PATH to be set in Local/Makefile and use it correctly
+      during configuration.  Wildcards are allowed and expanded.
+
+JH/02 Rework error string handling in DKIM to pass more info back to callers.
+      This permits better logging.
+
+JH/03 Rework the transport continued-connection mechanism: when TLS is active,
+      do not close it down and have the child transport start it up again on
+      the passed-on TCP connection.  Instead, proxy the child (and any
+      subsequent ones) for TLS via a unix-domain socket channel.  Logging is
+      affected: the continued delivery log lines do not have any DNSSEC, TLS
+      Certificate or OCSP information.  TLS cipher information is still logged.
+
+JH/04 Shorten the log line for daemon startup by collapsing adjacent sets of
+      identical IP addresses on different listening ports.  Will also affect
+      "exiwhat" output.
+
+PP/02 Bug 2070: uClibc defines __GLIBC__ without providing glibc headers;
+      add noisy ifdef guards to special-case this sillyness.
+      Patch from Bernd Kuhls.
+
+JH/05 Tighten up the checking in isip4 (et al): dotted-quad components larger
+      than 255 are no longer allowed.
+
+JH/06 Default openssl_options to include +no_ticket, to reduce load on peers.
+      Disable the session-cache too, which might reduce our load.  Since we
+      currrectly use a new context for every connection, both as server and
+      client, there is no benefit for these.
+      GnuTLS appears to not support tickets server-side by default (we don't
+      call gnutls_session_ticket_enable_server()) but client side is enabled
+      by default on recent versions (3.1.3 +) unless the PFS priority string
+      is used (3.2.4 +).
+
+PP/03 Add $SOURCE_DATE_EPOCH support for reproducible builds, per spec at
+      <https://reproducible-builds.org/specs/source-date-epoch/>.
+
+JH/07 Fix smtp transport use of limited max_rcpt under mua_wrapper. Previously
+      the check for any unsuccessful recipients did not notice the limit, and
+      erroneously found still-pending ones.
+
+JH/08 Pipeline CHUNKING command and data together, on kernels that support
+      MSG_MORE.  Only in-clear (not on TLS connections).
+
+JH/09 Avoid using a temporary file during transport using dkim.  Unless a
+      transport-filter is involved we can buffer the headers in memory for
+      creating the signature, and read the spool data file once for the
+      signature and again for transmission.
+
+JH/10 Enable use of sendfile in Linux builds as default.  It was disabled in
+      4.77 as the kernel support then wasn't solid, having issues in 64bit
+      mode.  Now, it's been long enough.  Add support for FreeBSD also.
+
+JH/11 Bug 2104: Fix continued use of a transport connection with TLS.  In the
+      case where the routing stage had gathered several addresses to send to
+      a host before calling the transport for the first, we previously failed
+      to close down TLS in the old transport process before passing the TCP
+      connection to the new process.  The new one sent a STARTTLS command
+      which naturally failed, giving a failed delivery and bloating the retry
+      database.  Investigation and fix prototype from Wolfgang Breyha.
+
+JH/12 Fix check on SMTP command input synchronisation.  Previously there were
+      false-negatives in the check that the sender had not preempted a response
+      or prompt from Exim (running as a server), due to that code's lack of
+      awareness of the SMTP input buffering.
+
+PP/04 Add commandline_checks_require_admin option.
+      Exim drops privileges sanely, various checks such as -be aren't a
+      security problem, as long as you trust local users with access to their
+      own account.  When invoked by services which pass untrusted data to
+      Exim, this might be an issue.  Set this option in main configuration
+      AND make fixes to the calling application, such as using `--` to stop
+      processing options.
+
+JH/13 Do pipelining under TLS.  Previously, although safe, no advantage was
+      taken.  Now take care to pack both (client) MAIL,RCPT,DATA, and (server)
+      responses to those, into a single TLS record each way (this usually means
+      a single packet).  As a side issue, smtp_enforce_sync now works on TLS
+      connections.
+
+PP/05 OpenSSL/1.1: use DH_bits() for more accurate DH param sizes.  This
+      affects you only if you're dancing at the edge of the param size limits.
+      If you are, and this message makes sense to you, then: raise the
+      configured limit or use OpenSSL 1.1.  Nothing we can do for older
+      versions.
+
+JH/14 For the "sock" variant of the malware scanner interface, accept an empty
+      cmdline element to get the documented default one.  Previously it was
+      inaccessible.
+
+JH/15 Fix a crash in the smtp transport caused when two hosts in succession
+      are unsuable for non-message-specific reasons - eg. connection timeout,
+      banner-time rejection.
+
+JH/16 Fix logging of delivery remote port, when specified by router, under
+      callout/hold.
+
+PP/06 Repair manualroute's ability to take options in any order, even if one
+      is the name of a transport.
+      Fixes bug 2140.
+
+HS/01 Cleanup, prevent repeated use of -p/-oMr (CVE-2017-1000369)
+
+JH/17 Change the list-building routines interface to use the expanding-string
+      triplet model, for better allocation and copying behaviour.
+
+JH/18 Prebuild the data-structure for "builtin" macros, for faster startup.
+      Previously it was constructed the first time a possibly-matching string
+      was met in the configuration file input during startup; now it is done
+      during compilation.
+
+JH/19 Bug 2141: Use the full-complex API for Berkeley DB rather than the legacy-
+      compatible one, to avoid the (poorly documented) possibility of a config
+      file in the working directory redirecting the DB files, possibly correpting
+      some existing file.  CVE-2017-10140 assigned for BDB.
+
+JH/20 Bug 2147: Do not defer for a verify-with-callout-and-random which is not
+      cache-hot.  Previously, although the result was properly cached, the
+      initial verify call returned a defer.
+
+JH/21 Bug 2151: Avoid using SIZE on the MAIL for a callout verify, on any but
+      the main verify for receipient in uncached-mode.
+
+JH/22 Retire historical build files to an "unsupported" subdir.  These are
+      defined as "ones for which we have no current evidence of testing".
+
+JH/23 DKIM: enforce the DNS pubkey record "h" permitted-hashes optional field,
+      if present.  Previously it was ignored.
+
+JH/24 Start using specified-initialisers in C structure init coding.  This is
+      a C99 feature (it's 2017, so now considered safe).
+
+JH/25 Use one-bit bitfields for flags in the "addr" data structure.  Previously
+      if was a fixed-sized field and bitmask ops via macros; it is now more
+      extensible.
+
+PP/07 GitHub PR 56: Apply MariaDB build fix.
+      Patch provided by Jaroslav Škarvada.
+
+PP/08 Bug 2161: Fix regression in sieve quoted-printable handling introduced
+      during Coverity cleanups [4.87 JH/47]
+      Diagnosis and fix provided by Michael Fischer v. Mollard.
+
+JH/26 Fix DKIM bug: when the pseudoheader generated for signing was exactly
+      the right size to place the terminating semicolon on its own folded
+      line, the header hash was calculated to an incorrect value thanks to
+      the (relaxed) space the fold became.
+
+HS/02 Fix Bug 2130: large writes from the transport subprocess were chunked
+      and confused the parent.
+
+JH/27 Fix SOCKS bug: an unitialized pointer was deref'd by the transport process
+      which could crash as a result.  This could lead to undeliverable messages.
+
+JH/28 Logging: "next input sent too soon" now shows where input was truncated
+      for log purposes.
+
+JH/29 Fix queue_run_in_order to ignore the PID portion of the message ID.  This
+      matters on fast-turnover and PID-randomising systems, which were getting
+      out-of-order delivery.
+
+JH/30 Fix a logging bug on aarch64: an unsafe routine was previously used for
+      a possibly-overlapping copy.  The symptom was that "Remote host closed
+      connection in response to HELO" was logged instead of the actual 4xx
+      error for the HELO.
+
+JH/31 Fix CHUNKING code to properly flush the unwanted chunk after an error.
+      Previously only that bufferd was discarded, resulting in SYMTP command
+      desynchronisation.
+
+JH/32 DKIM: when a message has multiple signatures matching an identity given
+      in dkim_verify_signers, run the dkim acl once for each.  Previously only
+      one run was done.  Bug 2189.
+
+JH/33 Downgrade an unfound-list name (usually a typo in the config file) from
+      "panic the current process" to "deliberately defer".  The panic log is
+      still written with the problem list name; the mail and reject logs now
+      get a temp-reject line for the message that was being handled, saying
+      something like "domains check lookup or other defer".  The SMTP 451
+      message is still "Temporary local problem".
+
+JH/34 Bug 2199: Fix a use-after-free while reading smtp input for header lines.
+      A crafted sequence of BDAT commands could result in in-use memory beeing
+      freed.  CVE-2017-16943.
+
+HS/03 Bug 2201: Fix checking for leading-dot on a line during headers reading
+      from SMTP input.  Previously it was always done; now only done for DATA
+      and not BDAT commands.  CVE-2017-16944.
+
+JH/35 Bug 2201: Flush received data in BDAT mode after detecting an error fatal
+      to the message (such as an overlong header line).  Previously this was
+      not done and we did not exit BDAT mode.  Followon from the previous item
+      though a different problem.
+
+
+Exim version 4.89
+-----------------
+
+JH/01 Bug 1922: Support IDNA2008.  This has slightly different conversion rules
+      than -2003 did; needs libidn2 in addition to libidn.
+
+JH/02 The path option on a pipe transport is now expanded before use.
+
+PP/01 GitHub PR 50: Do not call ldap_start_tls_s on ldapi:// connections.
+      Patch provided by "Björn", documentation fix added too.
+
+JH/03 Bug 2003: fix Proxy Protocol v2 handling: the address size field was
+      missing a wire-to-host endian conversion.
+
+JH/04 Bug 2004: fix CHUNKING in non-PIPELINEING mode.  Chunk data following
+      close after a BDAT command line could be taken as a following command,
+      giving a synch failure.  Fix by only checking for synch immediately
+      before acknowledging the chunk.
+
+PP/02 GitHub PR 52: many spelling fixes, which include fixing parsing of
+      no_require_dnssec option and creation of _HAVE_TRANSPORT_APPEND_MAILDIR
+      macro.  Patches provided by Josh Soref.
+
+JH/05 Have the EHLO response advertise VRFY, if there is a vrfy ACL defined.
+      Previously we did not; the RFC seems ambiguous and VRFY is not listed
+      by IANA as a service extension.  However, John Klensin suggests that we
+      should.
+
+JH/06 Bug 2017: Fix DKIM verification in -bh test mode.  The data feed into
+      the dkim code may be unix-mode line endings rather than smtp wire-format
+      CRLF, so prepend a CR to any bare LF.
+
+JH/07 Rationalise the coding for callout smtp conversations and transport ones.
+      As a side-benfit, callouts can now use PIPELINING hence fewer round-trips.
+
+JH/08 Bug 2016: Fix DKIM verification vs. CHUNKING.  Any BDAT commands after
+      the first were themselves being wrongly included in the feed into dkim
+      processing; with most chunk sizes in use this resulted in an incorrect
+      body hash calculated value.
+
+JH/09 Bug 2014: permit inclusion of a DKIM-Signature header in a received
+      DKIM signature block, for verification.  Although advised against by
+      standards it is specifically not ruled illegal.
+
+JH/10 Bug 2025: Fix reception of (quoted) local-parts with embedded spaces.
+
+JH/11 Bug 2029: Fix crash in DKIM verification when a message signature block is
+      missing a body hash (the bh= tag).
+
+JH/12 Bug 2018: Re-order Proxy Protocol startup versus TLS-on-connect startup.
+      It seems that HAProxy sends the Proxy Protocol information in clear and
+      only then does a TLS startup, so do the same.
+
+JH/13 Bug 2027: Avoid attempting to use TCP Fast Open for non-transport client
+      TCP connections (such as for Spamd) unless the daemon successfully set
+      Fast Open mode on its listening sockets.  This fixes breakage seen on
+      too-old kernels or those not configured for Fast Open, at the cost of
+      requiring both directions being enabled for TFO, and TFO never being used
+      by non-daemon-related Exim processes.
+
+JH/14 Bug 2000: Reject messages recieved with CHUNKING but with malformed line
+      endings, at least on the first header line.  Try to canonify any that get
+      past that check, despite the cost.
+
+JH/15 Angle-bracket nesting (an error inserted by broken sendmails) levels are
+      now limited to an arbitrary five deep, while parsing addresses with the
+      strip_excess_angle_brackets option enabled.
+
+PP/03 Bug 2018: For Proxy Protocol and TLS-on-connect, do not over-read and
+      instead leave the unprompted TLS handshake in socket buffer for the
+      TLS library to consume.
+
+PP/04 Bug 2018: Also handle Proxy Protocol v2 safely.
+
+PP/05 FreeBSD compat: handle that Ports no longer create /usr/bin/perl
+
+JH/16 Drop variables when they go out of scope.  Memory management drops a whole
+      region in one operation, for speed, and this leaves assigned pointers
+      dangling.  Add checks run only under the testsuite which checks all
+      variables at a store-reset and panics on a dangling pointer; add code
+      explicitly nulling out all the variables discovered.  Fixes one known
+      bug: a transport crash, where a dangling pointer for $sending_ip_address
+      originally assigned in a verify callout, is re-used.
+
+PP/06 Drop '.' from @INC in various Perl scripts.
+
+PP/07 Switch FreeBSD iconv to always use the base-system libc functions.
+
+PP/08 Reduce a number of compilation warnings under clang; building with
+      CC=clang CFLAGS+=-Wno-dangling-else -Wno-logical-op-parentheses
+      should be warning-free.
+
+JH/17 Fix inbound CHUNKING when DKIM disabled at runtime.
+
+HS/01 Fix portability problems introduced by PP/08 for platforms where
+      realloc(NULL) is not equivalent to malloc() [SunOS et al].
+
+HS/02 Bug 1974: Fix missing line terminator on the last received BDAT
+      chunk. This allows us to accept broken chunked messages. We need a more
+      general solution here.
+
+PP/09 Wrote util/chunking_fixqueue_finalnewlines.pl to help recover
+      already-broken messages in the queue.
+
+JH/18 Bug 2061: Fix ${extract } corrupting an enclosing ${reduce }  $value.
+
+JH/19 Fix reference counting bug in routing-generated-address tracking.
+
+
+Exim version 4.88
+-----------------
+
+JH/01 Use SIZE on MAIL FROM in a cutthrough connection, if the destination
+      supports it and a size is available (ie. the sending peer gave us one).
+
+JH/02 The obsolete acl condition "demime" is removed (finally, after ten
+      years of being deprecated). The replacements are the ACLs
+      acl_smtp_mime and acl_not_smtp_mime.
+
+JH/03 Upgrade security requirements imposed for hosts_try_dane: previously
+      a downgraded non-dane trust-anchor for the TLS connection (CA-style)
+      or even an in-clear connection were permitted.  Now, if the host lookup
+      was dnssec and dane was requested then the host is only used if the
+      TLSA lookup succeeds and is dnssec.  Further hosts (eg. lower priority
+      MXs) will be tried (for hosts_try_dane though not for hosts_require_dane)
+      if one fails this test.
+      This means that a poorly-configured remote DNS will make it incommunicado;
+      but it protects against a DNS-interception attack on it.
+
+JH/04 Bug 1810: make continued-use of an open smtp transport connection
+      non-noisy when a race steals the message being considered.
+
+JH/05 If main configuration option tls_certificate is unset, generate a
+      self-signed certificate for inbound TLS connections.
+
+JH/06 Bug 165: hide more cases of password exposure - this time in expansions
+      in rewrites and routers.
+
+JH/07 Retire gnutls_require_mac et.al.  These were nonfunctional since 4.80
+      and logged a warning sing 4.83; now they are a configuration file error.
+
+JH/08 Bug 1836: Fix crash in VRFY handling when handed an unqualified name
+      (lacking @domain).  Apply the same qualification processing as RCPT.
+
+JH/09 Bug 1804: Avoid writing msglog files when in -bh or -bhc mode.
+
+JH/10 Support ${sha256:} applied to a string (as well as the previous
+      certificate).
+
+JH/11 Cutthrough: avoid using the callout hints db on a verify callout when
+      a cutthrough deliver is pending, as we always want to make a connection.
+      This also avoids re-routing the message when later placing the cutthrough
+      connection after a verify cache hit.
+      Do not update it with the verify result either.
+
+JH/12 Cutthrough: disable when verify option success_on_redirect is used, and
+      when routing results in more than one destination address.
+
+JH/13 Cutthrough: expand transport dkim_domain option when testing for dkim
+      signing (which inhibits the cutthrough capability).  Previously only
+      the presence of an option was tested; now an expansion evaluating as
+      empty is permissible (obviously it should depend only on data available
+      when the cutthrough connection is made).
+
+JH/14 Fix logging of errors under PIPELINING.  Previously the log line giving
+      the relevant preceding SMTP command did not note the pipelining mode.
+
+JH/15 Fix counting of empty lines in $body_linecount and $message_linecount.
+      Previously they were not counted.
+
+JH/16 DANE: treat a TLSA lookup response having all non-TLSA RRs, the same
+      as one having no matching records.  Previously we deferred the message
+      that needed the lookup.
+
+JH/17 Fakereject: previously logged as a normal message arrival "<="; now
+      distinguished as "(=".
+
+JH/18 Bug 1867: make the fail_defer_domains option on a dnslookup router work
+      for missing MX records.  Previously it only worked for missing A records.
+
+JH/19 Bug 1850: support Radius libraries that return REJECT_RC.
+
+JH/20 Bug 1872: Ensure that acl_smtp_notquit is run when the connection drops
+      after the data-go-ahead and data-ack.  Patch from Jason Betts.
+
+JH/21 Bug 1846: Send DMARC forensic reports for reject and quarantine results,
+      even for a "none" policy.  Patch from Tony Meyer.
+
+JH/22 Fix continued use of a connection for further deliveries. If a port was
+      specified by a router, it must also match for the delivery to be
+      compatible.
+
+JH/23 Bug 1874: fix continued use of a connection for further deliveries.
+      When one of the recipients of a message was unsuitable for the connection
+      (has no matching addresses), we lost track of needing to mark it
+      deferred.  As a result mail would be lost.
+
+JH/24 Bug 1832: Log EHLO response on getting conn-close response for HELO.
+
+JH/25 Decoding ACL controls is now done using a binary search; the source code
+      takes up less space and should be simpler to maintain.  Merge the ACL
+      condition decode tables also, with similar effect.
+
+JH/26 Fix problem with one_time used on a redirect router which returned the
+      parent address unchanged.  A retry would see the parent address marked as
+      delivered, so not attempt the (identical) child.  As a result mail would
+      be lost.
+
+JH/27 Fix a possible security hole, wherein a process operating with the Exim
+      UID can gain a root shell.  Credit to http://www.halfdog.net/ for
+      discovery and writeup.  Ubuntu bug 1580454; no bug raised against Exim
+      itself :(
+
+JH/28 Enable {spool,log} filesystem space and inode checks as default.
+      Main config options check_{log,spool}_{inodes,space} are now
+      100 inodes, 10MB unless set otherwise in the configuration.
+
+JH/29 Fix the connection_reject log selector to apply to the connect ACL.
+      Previously it only applied to the main-section connection policy
+      options.
+
+JH/30 Bug 1897: fix callouts connection fallback from TLS to cleartext.
+
+PP/01 Changed default Diffie-Hellman parameters to be Exim-specific, created
+      by me.  Added RFC7919 DH primes as an alternative.
+
+PP/02 Unbreak build via pkg-config with new hash support when crypto headers
+      are not in the system include path.
+
+JH/31 Fix longstanding bug with aborted TLS server connection handling.  Under
+      GnuTLS, when a session startup failed (eg because the client disconnected)
+      Exim did stdio operations after fclose.  This was exposed by a recent
+      change which nulled out the file handle after the fclose.
+
+JH/32 Bug 1909: Fix OCSP proof verification for cases where the proof is
+      signed directly by the cert-signing cert, rather than an intermediate
+      OCSP-signing cert.  This is the model used by LetsEncrypt.
+
+JH/33 Bug 1914: Ensure socket is nonblocking before draining after SMTP QUIT.
+
+HS/01 Fix leak in verify callout under GnuTLS, about 3MB per recipient on
+      an incoming connection.
+
+HS/02 Bug 1802: Do not half-close the connection after sending a request
+      to rspamd.
+
+HS/03 Use "auto" as the default EC curve parameter. For OpenSSL < 1.0.2
+      fallback to "prime256v1".
+
+JH/34 SECURITY: Use proper copy of DATA command in error message.
+      Could leak key material.  Remotely exploitable.  CVE-2016-9963.
+
+
+Exim version 4.87
+-----------------
+
+JH/01 Bug 1664: Disable OCSP for GnuTLS library versions at/before 3.3.16
+      and 3.4.4 - once the server is enabled to respond to an OCSP request
+      it does even when not requested, resulting in a stapling non-aware
+      client dropping the TLS connection.
+
+TF/01 Code cleanup: Overhaul the debug_selector and log_selector machinery to
+      support variable-length bit vectors. No functional change.
+
+TF/02 Improve the consistency of logging incoming and outgoing interfaces.
+      The I= interface field on outgoing lines is now after the H= remote
+      host field, same as incoming lines. There is a separate
+      outgoing_interface log selector which allows you to disable the
+      outgoing I= field.
+
+JH/02 Bug 728: Close logfiles after a daemon-process "exceptional" log write.
+      If not running log_selector +smtp_connection the mainlog would be held
+      open indefinitely after a "too many connections" event, including to a
+      deleted file after a log rotate. Leave the per net connection logging
+      leaving it open for efficiency as that will be quickly detected by the
+      check on the next write.
+
+HS/01 Bug 1671: Fix post transport crash.
+      Processing the wait-<transport> messages could crash the delivery
+      process if the message IDs didn't exist for some reason. When
+      using 'split_spool_directory=yes' the construction of the spool
+      file name failed already, exposing the same netto behaviour.
+
+JH/03 Bug 425: Capture substrings in $regex1, $regex2 etc from regex &
+      mime_regex ACL conditions.
+
+JH/04 Bug 1686: When compiled with EXPERIMENTAL_DSN_INFO: Add extra information
+      to DSN fail messages (bounces): remote IP, remote greeting, remote response
+      to HELO, local diagnostic string.
+
+JH/05 Downgrade message for a TLS-certificate-based authentication fail from
+      log line to debug.  Even when configured with a tls authenticator many
+      client connections are expected to not authenticate in this way, so
+      an authenticate fail is not an error.
+
+HS/02 Add the Exim version string to the process info.  This way exiwhat
+      gives some more detail about the running daemon.
+
+JH/06 Bug 1395: time-limit caching of DNS lookups, to the TTL value.  This may
+      matter for fast-change records such as DNSBLs.
+
+JH/07 Bug 1678: Always record an interface option value, if set,  as part of a
+      retry record, even if constant.  There may be multiple transports with
+      different interface settings and the retry behaviour needs to be kept
+      distinct.
+
+JH/08 Bug 1586: exiqgrep now refuses to run if there are unexpected arguments.
+
+JH/09 Bug 1700: ignore space & tab embedded in base64 during decode.
+
+JH/10 Bug 840: fix log_defer_output option of pipe transport
+
+JH/11 Bug 830: use same host for all RCPTS of a message, even under
+      hosts_randomize.  This matters a lot when combined with mua_wrapper.
+
+JH/12 Bug 1706: percent and underbar characters are no longer escaped by the
+      ${quote_pgsql:<string>} operator.
+
+JH/13 Bug 1708: avoid misaligned access in cached lookup.
+
+JH/14 Change header file name for freeradius-client.  Relevant if compiling
+      with Radius support; from the Gentoo tree and checked under Fedora.
+
+JH/15 Bug 1712: Introduce $prdr_requested flag variable
+
+JH/16 Bug 1714: Permit an empty string as expansion result for transport
+      option transport_filter, meaning no filtering.
+
+JH/17 Bug 1713: Fix non-PDKIM_DEBUG build.  Patch from Jasen Betts.
+
+JH/18 Bug 1709: When built with TLS support, the tls_advertise_hosts option now
+      defaults to "*" (all hosts).  The variable is now available when not built
+      with TLS, default unset, mainly to enable keeping the testsuite sane.
+      If a server certificate is not supplied (via tls_certificate) an error is
+      logged, and clients will find TLS connections fail on startup.  Presumably
+      they will retry in-clear.
+      Packagers of Exim are strongly encouraged to create a server certificate
+      at installation time.
+
+HS/03 Add -bP config_file as a synonym for -bP configure_file, for consistency
+      with the $config_file variable.
+
+JH/19 Two additional event types: msg:rcpt:defer and msg:rcpt:host:defer. Both
+      in transport context, after the attempt, and per-recipient. The latter type
+      is per host attempted.  The event data is the error message, and the errno
+      information encodes the lookup type (A vs. MX) used for the (first) host,
+      and the trailing two digits of the smtp 4xx response.
+
+GF/01 Bug 1715: Fix for race condition in exicyclog, where exim could attempt
+      to write to mainlog (or rejectlog, paniclog) in the window between file
+      creation and permissions/ownership being changed. Particularly affects
+      installations where exicyclog is run as root, rather than exim user;
+      result is that the running daemon panics and dies.
+
+JH/20 Bug 1701: For MySQL lookups, support MySQL config file option group names.
+
+JH/21 Bug 1720: Add support for priority groups and weighted-random proxy
+      selection for the EXPERIMENTAL_SOCKS feature, via new per-proxy options
+      "pri" and "weight".  Note that the previous implicit priority given by the
+      list order is no longer honoured.
+
+JH/22 Bugs 963, 1721: Fix some corner cases in message body canonicalization
+      for DKIM processing.
+
+JH/23 Move SOCKS5 support from Experimental to mainline, enabled for a build
+      by defining SUPPORT_SOCKS.
+
+JH/26 Move PROXY support from Experimental to mainline, enabled for a build
+      by defining SUPPORT_PROXY.  Note that the proxy_required_hosts option
+      is renamed to hosts_proxy, and the proxy_{host,target}_{address,port}.
+      variables are renamed to proxy_{local,external}_{address,port}.
+
+JH/27 Move Internationalisation support from Experimental to mainline, enabled
+      for a build by defining SUPPORT_I18N
+
+JH/28 Bug 1745: Fix redis lookups to handle (quoted) spaces embedded in parts
+      of the query string, and make ${quote_redis:} do that quoting.
+
+JH/29 Move Events support from Experimental to mainline, enabled by default
+      and removable for a build by defining DISABLE_EVENT.
+
+JH/30 Updated DANE implementation code to current from Viktor Dukhovni.
+
+JH/31 Fix bug with hosts_connection_nolog and named-lists which were wrongly
+      cached by the daemon.
+
+JH/32 Move Redis support from Experimental to mainline, enabled for a build
+      by defining LOOKUP_REDIS. The libhiredis library is required.
+
+JH/33 Bug 1748: Permit ACL dnslists= condition in non-smtp ACLs if explicit
+      keys are given for lookup.
+
+JH/34 Bug 1192: replace the embedded copy of PolarSSL RSA routines in the DKIM
+      support, by using OpenSSL or GnuTLS library ones.  This means DKIM is
+      only supported when built with TLS support.  The PolarSSL SHA routines
+      are still used when the TLS library is too old for convenient support.
+
+JH/35 Require SINGLE_DH_USE by default in OpenSSL (main config option
+      openssl_options), for security.  OpenSSL forces this from version 1.1.0
+      server-side so match that on older versions.
+
+JH/36 Bug 1778: longstanding bug in memory use by the ${run } expansion: A fresh
+      allocation for $value could be released as the expansion processing
+      concluded, but leaving the global pointer active for it.
+
+JH/37 Bug 1769: Permit a VRFY ACL to override the default 252 response,
+      and to use the domains and local_parts ACL conditions.
+
+JH/38 Fix cutthrough bug with body lines having a single dot. The dot was
+      incorrectly not doubled on cutthrough transmission, hence seen as a
+      body-termination at the receiving system - resulting in truncated mails.
+      Commonly the sender saw a TCP-level error, and retransmitted the message
+      via the normal store-and-forward channel. This could result in duplicates
+      received - but deduplicating mailstores were liable to retain only the
+      initial truncated version.
+
+JH/39 Bug 1781: Fix use of DKIM private-keys having trailing '=' in the base-64.
+
+JH/40 Fix crash in queryprogram router when compiled with EXPERIMENTAL_SRS.
+
+JH/41 Bug 1792: Fix selection of headers to sign for DKIM: bottom-up.  While
+      we're in there, support oversigning also; bug 1309.
+
+JH/42 Bug 1796: Fix error logged on a malware scanner connection failure.
+
+HS/04 Add support for keep_environment and add_environment options.
+
+JH/43 Tidy coding issues detected by gcc --fsanitize=undefined.  Some remain;
+      either intentional arithmetic overflow during PRNG, or testing config-
+      induced overflows.
+
+JH/44 Bug 1800: The combination of a -bhc commandline option and cutthrough
+      delivery resulted in actual delivery.  Cancel cutthrough before DATA
+      stage.
+
+JH/45 Fix cutthrough, when connection not opened by verify and target hard-
+      rejects a recipient: pass the reject to the originator.
+
+JH/46 Multiple issues raised by Coverity. Some were obvious or plausible bugs.
+      Many were false-positives and ignorable, but it's worth fixing the
+      former class.
+
+JH/47 Fix build on HP-UX and older Solaris, which need (un)setenv now also
+      for the new environment-manipulation done at startup.  Move the routines
+      from being local to tls.c to being global via the os.c file.
+
+JH/48 Bug 1807: Fix ${extract } for the numeric/3-string case. While preparsing
+      an extract embedded as result-arg for a map, the first arg for extract
+      is unavailable so we cannot tell if this is a numbered or keyed
+      extraction.  Accept either.
+
+
+Exim version 4.86
+-----------------
+
+JH/01 Bug 1545: The smtp transport option "retry_include_ip_address" is now
+      expanded.
+
+JH/02 The smtp transport option "multi_domain" is now expanded.
+
+JH/03 The smtp transport now requests PRDR by default, if the server offers
+      it.
+
+JH/04 Certificate name checking on server certificates, when exim is a client,
+      is now done by default.  The transport option tls_verify_cert_hostnames
+      can be used to disable this per-host.  The build option
+      EXPERIMENTAL_CERTNAMES is withdrawn.
+
+JH/05 The value of the tls_verify_certificates smtp transport and main options
+      default to the word "system" to access the system default CA bundle.
+      For GnuTLS, only version 3.0.20 or later.
+
+JH/06 Verification of the server certificate for a TLS connection is now tried
+      (but not required) by default.  The verification status is now logged by
+      default, for both outbound TLS and client-certificate supplying inbound
+      TLS connections
+
+JH/07 Changed the default rfc1413 lookup settings to disable calls.  Few
+      sites use this now.
+
+JH/08 The EXPERIMENTAL_DSN compile option is no longer needed; all Delivery
+      Status Notification (bounce) messages are now MIME format per RFC 3464.
+      Support for RFC 3461 DSN options NOTIFY,ENVID,RET,ORCPT can be advertised
+      under the control of the dsn_advertise_hosts option, and routers may
+      have a dsn_lasthop option.
+
+JH/09 A timeout of 2 minutes is now applied to all malware scanner types by
+      default, modifiable by a malware= option.  The list separator for
+      the options can now be changed in the usual way.  Bug 68.
+
+JH/10 The smtp_receive_timeout main option is now expanded before use.
+
+JH/11 The incoming_interface log option now also enables logging of the
+      local interface on delivery outgoing connections.
+
+JH/12 The cutthrough-routing facility now supports multi-recipient mails,
+      if the interface and destination host and port all match.
+
+JH/13 Bug 344: The verify = reverse_host_lookup ACL condition now accepts a
+      /defer_ok option.
+
+JH/14 Bug 1573: The spam= ACL condition now additionally supports Rspamd.
+      Patch from Andrew Lewis.
+
+JH/15 Bug 670: The spamd_address main option (for the spam= ACL condition)
+      now supports optional time-restrictions, weighting, and priority
+      modifiers per server.  Patch originally by <rommer@active.by>.
+
+JH/16 The spamd_address main option now supports a mixed list of local
+      and remote servers.  Remote servers can be IPv6 addresses, and
+      specify a port-range.
+
+JH/17 Bug 68: The spamd_address main option now supports an optional
+      timeout value per server.
+
+JH/18 Bug 1581: Router and transport options headers_add/remove can
+      now have the list separator specified.
+
+JH/19 Bug 392: spamd_address, and clamd av_scanner, now support retry
+      option values.
+
+JH/20 Bug 1571: Ensure that $tls_in_peerdn is set, when verification fails
+      under OpenSSL.
+
+JH/21 Support for the A6 type of dns record is withdrawn.
+
+JH/22 Bug 608: The result of a QUIT or not-QUIT toplevel ACL now matters
+      rather than the verbs used.
+
+JH/23 Bug 1572: Increase limit on SMTP confirmation message copy size
+      from 255 to 1024 chars.
+
+JH/24 Verification callouts now attempt to use TLS by default.
+
+HS/01 DNSSEC options (dnssec_require_domains, dnssec_request_domains)
+      are generic router options now. The defaults didn't change.
+
+JH/25 Bug 466: Add RFC2322 support for MIME attachment filenames.
+      Original patch from Alexander Shikoff, worked over by JH.
+
+HS/02 Bug 1575: exigrep falls back to autodetection of compressed
+      files if ZCAT_COMMAND is not executable.
+
+JH/26 Bug 1539: Add timeout/retry options on dnsdb lookups.
+
+JH/27 Bug 286: Support SOA lookup in dnsdb lookups.
+
+JH/28 Bug 1588: Do not use the A lookup following an AAAA for setting the FQDN.
+      Normally benign, it bites when the pair was led to by a CNAME;
+      modern usage is to not canonicalize the domain to a CNAME target
+      (and we were inconsistent anyway for A-only vs AAAA+A).
+
+JH/29 Bug 1632: Removed the word "rejected" from line logged for ACL discards.
+
+JH/30 Check the forward DNS lookup for DNSSEC, in addition to the reverse,
+      when evaluating $sender_host_dnssec.
+
+JH/31 Check the HELO verification lookup for DNSSEC, adding new
+      $sender_helo_dnssec variable.
+
+JH/32 Bug 1397: Enable ECDHE on OpenSSL, just the NIST P-256 curve.
+
+JH/33 Bug 1346: Note MAIL cmd seen in -bS batch, to avoid smtp_no_mail log.
+
+JH/34 Bug 1648: Fix a memory leak seen with "mailq" and large queues.
+
+JH/35 Bug 1642: Fix support of $spam_ variables at delivery time.  Was
+      documented as working, but never had.  Support all but $spam_report.
+
+JH/36 Bug 1659: Guard checking of input smtp commands again pseudo-command
+      added for tls authenticator.
+
+HS/03 Add perl_taintmode main config option
+
+
+Exim version 4.85
+-----------------
+
+TL/01 When running the test suite, the README says that variables such as
+      no_msglog_check are global and can be placed anywhere in a specific
+      test's script, however it was observed that placement needed to be near
+      the beginning for it to behave that way. Changed the runtest perl
+      script to read through the entire script once to detect and set these
+      variables, reset to the beginning of the script, and then run through
+      the script parsing/test process like normal.
+
+TL/02 The BSD's have an arc4random API. One of the functions to induce
+      adding randomness was arc4random_stir(), but it has been removed in
+      OpenBSD 5.5. Detect this OpenBSD version and skip calling this
+      function when detected.
+
+JH/01 Expand the EXPERIMENTAL_TPDA feature.  Several different events now
+      cause callback expansion.
+
+TL/03 Bugzilla 1518: Clarify "condition" processing in routers; that
+      syntax errors in an expansion can be treated as a string instead of
+      logging or causing an error, due to the internal use of bool_lax
+      instead of bool when processing it.
+
+JH/02 Add EXPERIMENTAL_DANE, allowing for using the DNS as trust-anchor for
+      server certificates when making smtp deliveries.
+
+JH/03 Support secondary-separator specifier for MX, SRV, TLSA lookups.
+
+JH/04 Add ${sort {list}{condition}{extractor}} expansion item.
+
+TL/04 Bugzilla 1216: Add -M (related messages) option to exigrep.
+
+TL/05 GitHub Issue 18: Adjust logic testing for true/false in redis lookups.
+      Merged patch from Sebastian Wiedenroth.
+
+JH/05 Fix results-pipe from transport process.  Several recipients, combined
+      with certificate use, exposed issues where response data items split
+      over buffer boundaries were not parsed properly.  This eventually
+      resulted in duplicates being sent.  This issue only became common enough
+      to notice due to the introduction of connection certificate information,
+      the item size being so much larger.  Found and fixed by Wolfgang Breyha.
+
+JH/06 Bug 1533: Fix truncation of items in headers_remove lists.  A fixed
+      size buffer was used, resulting in syntax errors when an expansion
+      exceeded it.
+
+JH/07 Add support for directories of certificates when compiled with a GnuTLS
+      version 3.3.6 or later.
+
+JH/08 Rename the TPDA experimental facility to Event Actions.  The #ifdef
+      is EXPERIMENTAL_EVENT, the main-configuration and transport options
+      both become "event_action", the variables become $event_name, $event_data
+      and $event_defer_errno.  There is a new variable $verify_mode, usable in
+      routers, transports and related events.  The tls:cert event is now also
+      raised for inbound connections, if the main configuration event_action
+      option is defined.
+
+TL/06 In test suite, disable OCSP for old versions of openssl which contained
+      early OCSP support, but no stapling (appears to be less than 1.0.0).
+
+JH/09 When compiled with OpenSSL and EXPERIMENTAL_CERTNAMES, the checks on
+      server certificate names available under the smtp transport option
+      "tls_verify_cert_hostname" now do not permit multi-component wildcard
+      matches.
+
+JH/10 Time-related extraction expansions from certificates now use the main
+      option "timezone" setting for output formatting, and are consistent
+      between OpenSSL and GnuTLS compilations.  Bug 1541.
+
+JH/11 Fix a crash in mime ACL when meeting a zero-length, quoted or RFC2047-
+      encoded parameter in the incoming message.  Bug 1558.
+
+JH/12 Bug 1527: Autogrow buffer used in reading spool files.  Since they now
+      include certificate info, eximon was claiming there were spoolfile
+      syntax errors.
+
+JH/13 Bug 1521: Fix ldap lookup for single-attr request, multiple-attr return.
+
+JH/14 Log delivery-related information more consistently, using the sequence
+      "H=<name> [<ip>]" wherever possible.
+
+TL/07 Bug 1547: Omit RFCs from release. Draft and RFCs have licenses which
+      are problematic for Debian distribution, omit them from the release
+      tarball.
+
+JH/15 Updates and fixes to the EXPERIMENTAL_DSN feature.
+
+JH/16 Fix string representation of time values on 64bit time_t architectures.
+      Bug 1561.
+
+JH/17 Fix a null-indirection in certextract expansions when a nondefault
+      output list separator was used.
+
+
+Exim version 4.84
+-----------------
+TL/01 Bugzilla 1506: Re-add a 'return NULL' to silence complaints from static
+      checkers that were complaining about end of non-void function with no
+      return.
+
+JH/01 Bug 1513: Fix parsing of quoted parameter values in MIME headers.
+      This was a regression introduced in 4.83 by another bugfix.
+
+JH/02 Fix broken compilation when EXPERIMENTAL_DSN is enabled.
+
+TL/02 Bug 1509: Fix exipick for enhanced spoolfile specification used when
+      EXPERIMENTAL_DSN is enabled.  Fix from Wolfgang Breyha.
+
+
+Exim version 4.83
+-----------------
+
+TF/01 Correctly close the server side of TLS when forking for delivery.
+
+      When a message was received over SMTP with TLS, Exim failed to clear up
+      the incoming connection properly after forking off the child process to
+      deliver the message. In some situations the subsequent outgoing
+      delivery connection happened to have the same fd number as the incoming
+      connection previously had. Exim would try to use TLS and fail, logging
+      a "Bad file descriptor" error.
+
+TF/02 Portability fix for building lookup modules on Solaris when the xpg4
+      utilities have not been installed.
+
+JH/01 Fix memory-handling in use of acl as a conditional; avoid free of
+      temporary space as the ACL may create new global variables.
+
+TL/01 LDAP support uses per connection or global context settings, depending
+      upon the detected version of the libraries at build time.
+
+TL/02 Experimental Proxy Protocol support: allows a proxied SMTP connection
+      to extract and use the src ip:port in logging and expansions as if it
+      were a direct connection from the outside internet. PPv2 support was
+      updated based on HAProxy spec change in May 2014.
+
+JH/02 Add ${listextract {number}{list}{success}{fail}}.
+
+TL/03 Bugzilla 1433: Fix DMARC SEGV with specific From header contents.
+      Properly escape header and check for NULL return.
+
+PP/01 Continue incomplete 4.82 PP/19 by fixing docs too: use dns_dnssec_ok
+      not dns_use_dnssec.
+
+JH/03 Bugzilla 1157: support log_selector smtp_confirmation for lmtp.
+
+TL/04 Add verify = header_names_ascii check to reject email with non-ASCII
+      characters in header names, implemented as a verify condition.
+      Contributed by Michael Fischer v. Mollard.
+
+TL/05 Rename SPF condition results err_perm and err_temp to standardized
+      results permerror and temperror.  Previous values are deprecated but
+      still accepted.  In a future release, err_perm and err_temp will be
+      completely removed, which will be a backward incompatibility if the
+      ACL tests for either of these two old results. Patch contributed by
+      user bes-internal on the mailing list.
+
+JH/04 Add ${utf8clean:} operator. Contributed by Alex Rau.
+
+JH/05 Bugzilla 305: Log incoming-TLS details on rejects, subject to log
+      selectors, in both main and reject logs.
+
+JH/06 Log outbound-TLS and port details, subject to log selectors, for a
+      failed delivery.
+
+JH/07 Add malware type "sock" for talking to simple daemon.
+
+JH/08 Bugzilla 1371: Add tls_{,try_}verify_hosts to smtp transport.
+
+JH/09 Bugzilla 1431: Support (with limitations) headers_add/headers_remove in
+      routers/transports under cutthrough routing.
+
+JH/10 Bugzilla 1005: ACL "condition =" should accept values which are negative
+      numbers.  Touch up "bool" conditional to keep the same definition.
+
+TL/06 Remove duplicated language in spec file from 4.82 TL/16.
+
+JH/11 Add dnsdb tlsa lookup.  From Todd Lyons.
+
+JH/12 Expand items in router/transport headers_add or headers_remove lists
+      individually rather than the list as a whole.  Bug 1452.
+
+      Required for reasonable handling of multiple headers_ options when
+      they may be empty; requires that headers_remove items with embedded
+      colons must have them doubled (or the list-separator changed).
+
+TL/07 Add new dmarc expansion variable $dmarc_domain_policy to directly
+      view the policy declared in the DMARC record. Currently, $dmarc_status
+      is a combined value of both the record presence and the result of the
+      analysis.
+
+JH/13 Fix handling of $tls_cipher et.al. in (non-verify) transport.  Bug 1455.
+
+JH/14 New options dnssec_request_domains, dnssec_require_domains on the
+      dnslookup router and the smtp transport (applying to the forward
+      lookup).
+
+TL/08 Bugzilla 1453: New LDAP "SERVERS=" option allows admin to override list
+      of ldap servers used for a specific lookup.  Patch provided by Heiko
+      Schlichting.
+
+JH/18 New options dnssec_lax, dnssec_strict on dnsdb lookups.
+      New variable $lookup_dnssec_authenticated for observability.
+
+TL/09 Bugzilla 609: Add -C option to exiqgrep, specify which exim.conf to use.
+      Patch submitted by Lars Timman.
+
+JH/19 EXPERIMENTAL_OCSP support under GnuTLS.  Bug 1459.
+
+TL/10 Bugzilla 1454: New -oMm option to pass message reference to Exim.
+      Requires trusted mode and valid format message id, aborts otherwise.
+      Patch contributed by Heiko Schlichting.
+
+JH/20 New expansion variables tls_(in,out)_(our,peer)cert, and expansion item
+      certextract with support for various fields.  Bug 1358.
+
+JH/21 Observability of OCSP via variables tls_(in,out)_ocsp.  Stapling
+      is requested by default, modifiable by smtp transport option
+      hosts_request_ocsp.
+
+JH/22 Expansion operators ${md5:string} and ${sha1:string} can now
+      operate on certificate variables to give certificate fingerprints
+      Also new ${sha256:cert_variable}.
+
+JH/23 The PRDR feature is moved from being Experimental into the mainline.
+
+TL/11 Bug 1119: fix memory allocation in string_printing2().  Patch from
+      Christian Aistleitner.
+
+JH/24 The OCSP stapling feature is moved from Experimental into the mainline.
+
+TL/12 Bug 1444: Fix improper \r\n sequence handling when writing spool
+      file.  Patch from Wolfgang Breyha.
+
+JH/25 Expand the coverage of the delivery $host and $host_address to
+      client authenticators run in verify callout.  Bug 1476.
+
+JH/26 Port service names are now accepted for tls_on_connect_ports, to
+      align with daemon_smtp_ports.  Bug 72.
+
+TF/03 Fix udpsend. The ip_connectedsocket() function's socket type
+      support and error reporting did not work properly.
+
+TL/13 Bug 1495: Exiqgrep check if -C config file specified on cli exists
+      and is readable.  Patch from Andrew Colin Kissa.
+
+TL/14 Enhance documentation of ${run expansion and how it parses the
+      commandline after expansion, particularly in the case when an
+      unquoted variable expansion results in an empty value.
+
+JH/27 The TLS SNI feature was broken in 4.82.  Fix it.
+
+PP/02 Fix internal collision of T_APL on systems which support RFC3123
+      by renaming away from it.  Addresses GH issue 15, reported by
+      Jasper Wallace.
+
+JH/28 Fix parsing of MIME headers for parameters with quoted semicolons.
+
+TL/15 SECURITY: prevent double expansion in math comparison functions
+      (can expand unsanitized data). Not remotely exploitable.
+      CVE-2014-2972
+
+
+Exim version 4.82
+-----------------
+
+PP/01 Add -bI: framework, and -bI:sieve for querying sieve capabilities.
+
+PP/02 Make -n do something, by making it not do something.
+      When combined with -bP, the name of an option is not output.
+
+PP/03 Added tls_dh_min_bits SMTP transport driver option, only honoured
+      by GnuTLS.
+
+PP/04 First step towards DNSSEC, provide $sender_host_dnssec for
+      $sender_host_name and config options to manage this, and basic check
+      routines.
+
+PP/05 DSCP support for outbound connections and control modifier for inbound.
+
+PP/06 Cyrus SASL: set local and remote IP;port properties for driver.
+      (Only plugin which currently uses this is kerberos4, which nobody should
+      be using, but we should make it available and other future plugins might
+      conceivably use it, even though it would break NAT; stuff *should* be
+      using channel bindings instead).
+
+PP/07 Handle "exim -L <tag>" to indicate to use syslog with tag as the process
+      name; added for Sendmail compatibility; requires admin caller.
+      Handle -G as equivalent to "control = suppress_local_fixups" (we used to
+      just ignore it); requires trusted caller.
+      Also parse but ignore: -Ac -Am -X<logfile>
+      Bugzilla 1117.
+
+TL/01 Bugzilla 1258 - Refactor MAIL FROM optional args processing.
+
+TL/02 Add +smtp_confirmation as a default logging option.
+
+TL/03 Bugzilla 198 - Implement remove_header ACL modifier.
+      Patch by Magnus Holmgren from 2007-02-20.
+
+TL/04 Bugzilla 1281 - Spec typo.
+      Bugzilla 1283 - Spec typo.
+      Bugzilla 1290 - Spec grammar fixes.
+
+TL/05 Bugzilla 1285 - Spec omission, fix docbook errors for spec.txt creation.
+
+TL/06 Add Experimental DMARC support using libopendmarc libraries.
+
+TL/07 Fix an out of order global option causing a segfault.  Reported to dev
+      mailing list by by Dmitry Isaikin.
+
+JH/01 Bugzilla 1201 & 304 - New cutthrough-delivery feature, with TLS support.
+
+JH/02 Support "G" suffix to numbers in ${if comparisons.
+
+PP/08 Handle smtp transport tls_sni option forced-fail for OpenSSL.
+
+NM/01 Bugzilla 1197 - Spec typo
+      Bugzilla 1196 - Spec examples corrections
+
+JH/03 Add expansion operators ${listnamed:name} and ${listcount:string}
+
+PP/09 Add gnutls_allow_auto_pkcs11 option (was originally called
+      gnutls_enable_pkcs11, but renamed to more accurately indicate its
+      function.
+
+PP/10 Let Linux makefile inherit CFLAGS/CFLAGS_DYNAMIC.
+      Pulled from Debian 30_dontoverridecflags.dpatch by Andreas Metzler.
+
+JH/04 Add expansion item ${acl {name}{arg}...}, expansion condition
+      "acl {{name}{arg}...}", and optional args on acl condition
+      "acl = name arg..."
+
+JH/05 Permit multiple router/transport headers_add/remove lines.
+
+JH/06 Add dnsdb pseudo-lookup "a+" to do an "aaaa" + "a" combination.
+
+JH/07 Avoid using a waiting database for a single-message-only transport.
+      Performance patch from Paul Fisher.  Bugzilla 1262.
+
+JH/08 Strip leading/trailing newlines from add_header ACL modifier data.
+      Bugzilla 884.
+
+JH/09 Add $headers_added variable, with content from use of ACL modifier
+      add_header (but not yet added to the message).  Bugzilla 199.
+
+JH/10 Add 8bitmime log_selector, for 8bitmime status on the received line.
+      Pulled from Bugzilla 817 by Wolfgang Breyha.
+
+PP/11 SECURITY: protect DKIM DNS decoding from remote exploit.
+      CVE-2012-5671
+      (nb: this is the same fix as in Exim 4.80.1)
+
+JH/11 Add A= logging on delivery lines, and a client_set_id option on
+      authenticators.
+
+JH/12 Add optional authenticated_sender logging to A= and a log_selector
+      for control.
+
+PP/12 Unbreak server_set_id for NTLM/SPA auth, broken by 4.80 PP/29.
+
+PP/13 Dovecot auth: log better reason to rejectlog if Dovecot did not
+      advertise SMTP AUTH mechanism to us, instead of a generic
+      protocol violation error.  Also, make Exim more robust to bad
+      data from the Dovecot auth socket.
+
+TF/01 Fix ultimate retry timeouts for intermittently deliverable recipients.
+
+      When a queue runner is handling a message, Exim first routes the
+      recipient addresses, during which it prunes them based on the retry
+      hints database. After that it attempts to deliver the message to
+      any remaining recipients. It then updates the hints database using
+      the retry rules.
+
+      So if a recipient address works intermittently, it can get repeatedly
+      deferred at routing time. The retry hints record remains fresh so the
+      address never reaches the final cutoff time.
+
+      This is a fairly common occurrence when a user is bumping up against
+      their storage quota. Exim had some logic in its local delivery code
+      to deal with this. However it did not apply to per-recipient defers
+      in remote deliveries, e.g. over LMTP to a separate IMAP message store.
+
+      This change adds a proper retry rule check during routing so that the
+      final cutoff time is checked against the message's age. We only do
+      this check if there is an address retry record and there is not a
+      domain retry record; this implies that previous attempts to handle
+      the address had the retry_use_local_parts option turned on. We use
+      this as an approximation for the destination being like a local
+      delivery, as in LMTP.
+
+      I suspect this new check makes the old local delivery cutoff check
+      redundant, but I have not verified this so I left the code in place.
+
+TF/02 Correct gecos expansion when From: is a prefix of the username.
+
+      Test 0254 submits a message to Exim with the header
+
+        Resent-From: f
+
+      When I ran the test suite under the user fanf2, Exim expanded
+      the header to contain my full name, whereas it should have added
+      a Resent-Sender: header. It erroneously treats any prefix of the
+      username as equal to the username.
+
+      This change corrects that bug.
+
+GF/01 DCC debug and logging tidyup
+      Error conditions log to paniclog rather than rejectlog.
+      Debug lines prefixed by "DCC: " to remove any ambiguity.
+
+TF/03 Avoid unnecessary rebuilds of lookup-related code.
+
+PP/14 Fix OCSP reinitialisation in SNI handling for Exim/TLS as server.
+      Bug spotted by Jeremy Harris; was flawed since initial commit.
+      Would have resulted in OCSP responses post-SNI triggering an Exim
+      NULL dereference and crash.
+
+JH/13 Add $router_name and $transport_name variables.  Bugzilla 308.
+
+PP/15 Define SIOCGIFCONF_GIVES_ADDR for GNU Hurd.
+      Bug detection, analysis and fix by Samuel Thibault.
+      Bugzilla 1331, Debian bug #698092.
+
+SC/01 Update eximstats to watch out for senders sending 'HELO [IpAddr]'
+
+JH/14 SMTP PRDR (http://www.eric-a-hall.com/specs/draft-hall-prdr-00.txt).
+      Server implementation by Todd Lyons, client by JH.
+      Only enabled when compiled with EXPERIMENTAL_PRDR.  A new
+      config variable "prdr_enable" controls whether the server
+      advertises the facility.  If the client requests PRDR a new
+      acl_data_smtp_prdr ACL is called once for each recipient, after
+      the body content is received and before the acl_smtp_data ACL.
+      The client is controlled by both of: a hosts_try_prdr option
+      on the smtp transport, and the server advertisement.
+      Default client logging of deliveries and rejections involving
+      PRDR are flagged with the string "PRDR".
+
+PP/16 Fix problems caused by timeouts during quit ACLs trying to double
+      fclose().  Diagnosis by Todd Lyons.
+
+PP/17 Update configure.default to handle IPv6 localhost better.
+      Patch by Alain Williams (plus minor tweaks).
+      Bugzilla 880.
+
+PP/18 OpenSSL made graceful with empty tls_verify_certificates setting.
+      This is now consistent with GnuTLS, and is now documented: the
+      previous undocumented portable approach to treating the option as
+      unset was to force an expansion failure.  That still works, and
+      an empty string is now equivalent.
+
+PP/19 Renamed DNSSEC-enabling option to "dns_dnssec_ok", to make it
+      clearer that Exim is using the DO (DNSSEC OK) EDNS0 resolver flag,
+      not performing validation itself.
+
+PP/20 Added force_command boolean option to pipe transport.
+      Patch from Nick Koston, of cPanel Inc.
+
+JH/15 AUTH support on callouts (and hence cutthrough-deliveries).
+      Bugzilla 321, 823.
+
+TF/04 Added udpsend ACL modifier and hexquote expansion operator
+
+PP/21 Fix eximon continuous updating with timestamped log-files.
+      Broken in a format-string cleanup in 4.80, missed when I repaired the
+      other false fix of the same issue.
+      Report and fix from Heiko Schlichting.
+      Bugzilla 1363.
+
+PP/22 Guard LDAP TLS usage against Solaris LDAP variant.
+      Report from Prashanth Katuri.
+
+PP/23 Support safari_ecdhe_ecdsa_bug for openssl_options.
+      It's SecureTransport, so affects any MacOS clients which use the
+      system-integrated TLS libraries, including email clients.
+
+PP/24 Fix segfault from trying to fprintf() to a NULL stdio FILE* if
+      using a MIME ACL for non-SMTP local injection.
+      Report and assistance in diagnosis by Warren Baker.
+
+TL/08 Adjust exiqgrep to be case-insensitive for sender/receiver.
+
+JH/16 Fix comparisons for 64b.  Bugzilla 1385.
+
+TL/09 Add expansion variable $authenticated_fail_id to keep track of
+      last id that failed so it may be referenced in subsequent ACL's.
+
+TL/10 Bugzilla 1375 - Prevent TLS rebinding in ldap. Patch provided by
+      Alexander Miroch.
+
+TL/11 Bugzilla 1382 - Option ldap_require_cert overrides start_tls
+      ldap library initialization, allowing self-signed CA's to be
+      used. Also properly sets require_cert option later in code by
+      using NULL (global ldap config) instead of ldap handle (per
+      session). Bug diagnosis and testing by alxgomz.
+
+TL/12 Enhanced documentation in the ratelimit.pl script provided in
+      the src/util/ subdirectory.
+
+TL/13 Bug 1031 - Imported transport SQL logging patch from Axel Rau
+      renamed to Transport Post Delivery Action by Jeremy Harris, as
+      EXPERIMENTAL_TPDA.
+
+TL/14 Bugzilla 1217 - Redis lookup support has been added. It is only enabled
+      when Exim is compiled with EXPERIMENTAL_REDIS. A new config variable
+      redis_servers = needs to be configured which will be used by the redis
+      lookup.  Patch from Warren Baker, of The Packet Hub.
+
+TL/15 Fix exiqsumm summary for corner case. Patch provided by Richard Hall.
+
+TL/16 Bugzilla 1289 - Clarify host/ip processing when have errors looking up a
+      hostname or reverse DNS when processing a host list. Used suggestions
+      from multiple comments on this bug.
+
+TL/17 Bugzilla 1057 - Multiple clamd TCP targets patch from Mark Zealey.
+
+TL/18 Had previously added a -CONTINUE option to runtest in the test suite.
+      Missed a few lines, added it to make the runtest require no keyboard
+      interaction.
+
+TL/19 Bugzilla 1402 - Test 533 fails if any part of the path to the test suite
+      contains upper case chars. Make router use caseful_local_part.
+
+TL/20 Bugzilla 1400 - Add AVOID_GNUTLS_PKCS11 build option. Allows GnuTLS
+      support when GnuTLS has been built with p11-kit.
+
+
+Exim version 4.80.1
+-------------------
+
+PP/01 SECURITY: protect DKIM DNS decoding from remote exploit.
+      CVE-2012-5671
+      This, or similar/improved, will also be change PP/11 of 4.82.
+
+
+Exim version 4.80
+-----------------
+
+PP/01 Handle short writes when writing local log-files.
+      In practice, only affects FreeBSD (8 onwards).
+      Bugzilla 1053, with thanks to Dmitry Isaikin.
+
+NM/01 Bugzilla 949 - Documentation tweak
+
+NM/02 Bugzilla 1093 - eximstats DATA reject detection regexps
+      improved.
+
+NM/03 Bugzilla 1169 - primary_hostname spelling was incorrect in docs.
+
+PP/02 Implemented gsasl authenticator.
+
+PP/03 Implemented heimdal_gssapi authenticator with "server_keytab" option.
+
+PP/04 Local/Makefile support for (AUTH|LOOKUP)_*_PC=foo to use
+      `pkg-config foo` for cflags/libs.
+
+PP/05 Swapped $auth1/$auth2 for gsasl GSSAPI mechanism, to be more consistent
+      with rest of GSASL and with heimdal_gssapi.
+
+PP/06 Local/Makefile support for USE_(GNUTLS|OPENSSL)_PC=foo to use
+      `pkg-config foo` for cflags/libs for the TLS implementation.
+
+PP/07 New expansion variable $tls_bits; Cyrus SASL server connection
+      properties get this fed in as external SSF.  A number of robustness
+      and debugging improvements to the cyrus_sasl authenticator.
+
+PP/08 cyrus_sasl server now expands the server_realm option.
+
+PP/09 Bugzilla 1214 - Log authentication information in reject log.
+      Patch by Jeremy Harris.
+
+PP/10 Added dbmjz lookup type.
+
+PP/11 Let heimdal_gssapi authenticator take a SASL message without an authzid.
+
+PP/12 MAIL args handles TAB as well as SP, for better interop with
+      non-compliant senders.
+      Analysis and variant patch by Todd Lyons.
+
+NM/04 Bugzilla 1237 - fix cases where printf format usage not indicated
+      Bug report from Lars Müller <lars@samba.org> (via SUSE),
+      Patch from Dirk Mueller <dmueller@suse.com>
+
+PP/13 tls_peerdn now print-escaped for spool files.
+      Observed some $tls_peerdn in wild which contained \n, which resulted
+      in spool file corruption.
+
+PP/14 TLS fixes for OpenSSL: support TLS 1.1 & 1.2; new "openssl_options"
+      values; set SSL_MODE_AUTO_RETRY so that OpenSSL will retry a read
+      or write after TLS renegotiation, which otherwise led to messages
+      "Got SSL error 2".
+
+TK/01 Bugzilla 1239 - fix DKIM verification when signature was not inserted
+      as a tracking header (ie: a signed header comes before the signature).
+      Patch from Wolfgang Breyha.
+
+JH/01 Bugzilla 660 - Multi-valued attributes from ldap now parseable as a
+      comma-sep list; embedded commas doubled.
+
+JH/02 Refactored ACL "verify =" logic to table-driven dispatch.
+
+PP/15 LDAP: Check for errors of TLS initialisation, to give correct
+      diagnostics.
+      Report and patch from Dmitry Banschikov.
+
+PP/16 Removed "dont_insert_empty_fragments" from "openssl_options".
+      Removed SSL_clear() after SSL_new() which led to protocol negotiation
+      failures.  We appear to now support TLS1.1+ with Exim.
+
+PP/17 OpenSSL: new expansion var $tls_sni, which if used in tls_certificate
+      lets Exim select keys and certificates based upon TLS SNI from client.
+      Also option tls_sni on SMTP Transports.  Also clear $tls_bits correctly
+      before an outbound SMTP session.  New log_selector, +tls_sni.
+
+PP/18 Bugzilla 1122 - check localhost_number expansion for failure, avoid
+      NULL dereference.  Report and patch from Alun Jones.
+
+PP/19 DNS resolver init changes for NetBSD compatibility.  (Risk of breakage
+      on less well tested platforms).  Obviates NetBSD pkgsrc patch-ac.
+      Not seeing resolver debug output on NetBSD, but suspect this is a
+      resolver implementation change.
+
+PP/20 Revert part of NM/04, it broke log_path containing %D expansions.
+      Left warnings.  Added "eximon gdb" invocation mode.
+
+PP/21 Defaulting "accept_8bitmime" to true, not false.
+
+PP/22 Added -bw for inetd wait mode support.
+
+PP/23 Added PCRE_CONFIG=yes support to Makefile for using pcre-config to
+      locate the relevant includes and libraries.  Made this the default.
+
+PP/24 Fixed headers_only on smtp transports (was not sending trailing dot).
+      Bugzilla 1246, report and most of solution from Tomasz Kusy.
+
+JH/03 ${eval } now uses 64-bit and supports a "g" suffix (like to "k" and "m").
+      This may cause build issues on older platforms.
+
+PP/25 Revamped GnuTLS support, passing tls_require_ciphers to
+      gnutls_priority_init, ignoring Exim options gnutls_require_kx,
+      gnutls_require_mac & gnutls_require_protocols (no longer supported).
+      Added SNI support via GnuTLS too.
+      Made ${randint:..} supplier available, if using not-too-old GnuTLS.
+
+PP/26 Added EXPERIMENTAL_OCSP for OpenSSL.
+
+PP/27 Applied dnsdb SPF support patch from Janne Snabb.
+      Applied second patch from Janne, implementing suggestion to default
+      multiple-strings-in-record handling to match SPF spec.
+
+JH/04 Added expansion variable $tod_epoch_l for a higher-precision time.
+
+PP/28 Fix DCC dcc_header content corruption (stack memory referenced,
+      read-only, out of scope).
+      Patch from Wolfgang Breyha, report from Stuart Northfield.
+
+PP/29 Fix three issues highlighted by clang analyser static analysis.
+      Only crash-plausible issue would require the Cambridge-specific
+      iplookup router and a misconfiguration.
+      Report from Marcin Mirosław.
+
+PP/30 Another attempt to deal with PCRE_PRERELEASE, this one less buggy.
+
+PP/31 %D in printf continues to cause issues (-Wformat=security), so for
+      now guard some of the printf checks behind WANT_DEEPER_PRINTF_CHECKS.
+      As part of this, removing so much warning spew let me fix some minor
+      real issues in debug logging.
+
+PP/32 GnuTLS was always using default tls_require_ciphers, due to a missing
+      assignment on my part.  Fixed.
+
+PP/33 Added tls_dh_max_bits option, defaulting to current hard-coded limit
+      of NSS, for GnuTLS/NSS interop.  Problem root cause diagnosis by
+      Janne Snabb (who went above and beyond: thank you).
+
+PP/34 Validate tls_require_ciphers on startup, since debugging an invalid
+      string otherwise requires a connection and a bunch more work and it's
+      relatively easy to get wrong.  Should also expose TLS library linkage
+      problems.
+
+PP/35 Pull in <features.h> on Linux, for some portability edge-cases of
+      64-bit ${eval} (JH/03).
+
+PP/36 Define _GNU_SOURCE in exim.h; it's needed for some releases of
+      GNU libc to support some of the 64-bit stuff, should not lead to
+      conflicts.  Defined before os.h is pulled in, so if a given platform
+      needs to override this, it can.
+
+PP/37 Unbreak Cyrus SASL auth: SSF retrieval was incorrect, Exim thought
+      protection layer was required, which is not implemented.
+      Bugzilla 1254, patch from Wolfgang Breyha.
+
+PP/38 Overhaul DH prime handling, supply RFC-specified DH primes as built
+      into Exim, default to IKE id 23 from RFC 5114 (2048 bit).  Make
+      tls_dhparam take prime identifiers.  Also unbreak combination of
+      OpenSSL+DH_params+TLSSNI.
+
+PP/39 Disable SSLv2 by default in OpenSSL support.
+
+
+Exim version 4.77
+-----------------
+
+PP/01 Solaris build fix for Oracle's LDAP libraries.
+      Bugzilla 1109, patch from Stephen Usher.
+
+TF/01 HP/UX build fix: avoid arithmetic on a void pointer.
+
+TK/01 DKIM Verification: Fix relaxed canon for empty headers w/o
+      whitespace trailer
+
+TF/02 Fix a couple more cases where we did not log the error message
+      when unlink() failed. See also change 4.74-TF/03.
+
+TF/03 Make the exiwhat support code safe for signals. Previously Exim might
+      lock up or crash if it happened to be inside a call to libc when it
+      got a SIGUSR1 from exiwhat.
+
+      The SIGUSR1 handler appends the current process status to the process
+      log which is later printed by exiwhat. It used to use the general
+      purpose logging code to do this, but several functions it calls are
+      not safe for signals.
+
+      The new output code in the SIGUSR1 handler is specific to the process
+      log, and simple enough that it's easy to inspect for signal safety.
+      Removing some special cases also simplifies the general logging code.
+      Removing the spurious timestamps from the process log simplifies
+      exiwhat.
+
+TF/04 Improved ratelimit ACL condition.
+
+      The /noupdate option has been deprecated in favour of /readonly which
+      has clearer semantics. The /leaky, /strict, and /readonly update modes
+      are mutually exclusive. The update mode is no longer included in the
+      database key; it just determines when the database is updated. (This
+      means that when you upgrade Exim will forget old rate measurements.)
+
+      Exim now checks that the per_* options are used with an update mode that
+      makes sense for the current ACL. For example, when Exim is processing a
+      message (e.g. acl_smtp_rcpt or acl_smtp_data, etc.) you can specify
+      per_mail/leaky or per_mail/strict; otherwise (e.g. in acl_smtp_helo) you
+      must specify per_mail/readonly. If you omit the update mode it defaults to
+      /leaky where that makes sense (as before) or /readonly where required.
+
+      The /noupdate option is now undocumented but still supported for
+      backwards compatibility. It is equivalent to /readonly except that in
+      ACLs where /readonly is required you may specify /leaky/noupdate or
+      /strict/noupdate which are treated the same as /readonly.
+
+      A useful new feature is the /count= option. This is a generalization
+      of the per_byte option, so that you can measure the throughput of other
+      aggregate values. For example, the per_byte option is now equivalent
+      to per_mail/count=${if >{0}{$message_size} {0} {$message_size} }.
+
+      The per_rcpt option has been generalized using the /count= mechanism
+      (though it's more complicated than the per_byte equivalence). When it is
+      used in acl_smtp_rcpt, the per_rcpt option adds recipients to the
+      measured rate one at a time; if it is used later (e.g. in acl_smtp_data)
+      or in a non-SMTP ACL it adds all the recipients in one go. (The latter
+      /count=$recipients_count behaviour used to work only in non-SMTP ACLs.)
+      Note that using per_rcpt with a non-readonly update mode in more than
+      one ACL will cause the recipients to be double-counted. (The per_mail
+      and per_byte options don't have this problem.)
+
+      The handling of very low rates has changed slightly. If the computed rate
+      is less than the event's count (usually one) then this event is the first
+      after a long gap. In this case the rate is set to the same as this event's
+      count, so that the first message of a spam run is counted properly.
+
+      The major new feature is a mechanism for counting the rate of unique
+      events. The new per_addr option counts the number of different
+      recipients that someone has sent messages to in the last time period. It
+      behaves like per_rcpt if all the recipient addresses are different, but
+      duplicate recipient addresses do not increase the measured rate. Like
+      the /count= option this is a general mechanism, so the per_addr option
+      is equivalent to per_rcpt/unique=$local_part@$domain. You can, for
+      example, measure the rate that a client uses different sender addresses
+      with the options per_mail/unique=$sender_address. There are further
+      details in the main documentation.
+
+TF/05 Removed obsolete $Cambridge$ CVS revision strings.
+
+TF/06 Removed a few PCRE remnants.
+
+TF/07 Automatically extract Exim's version number from tags in the git
+      repository when doing development or release builds.
+
+PP/02 Raise smtp_cmd_buffer_size to 16kB.
+      Bugzilla 879.  Patch from Paul Fisher.
+
+PP/03 Implement SSL-on-connect outbound with protocol=smtps on smtp transport.
+      Heavily based on revision 40f9a89a from Simon Arlott's tree.
+      Bugzilla 97.
+
+PP/04 Use .dylib instead of .so for dynamic library loading on MacOS.
+
+PP/05 Variable $av_failed, true if the AV scanner deferred.
+      Bugzilla 1078.  Patch from John Horne.
+
+PP/06 Stop make process more reliably on build failure.
+      Bugzilla 1087.  Patch from Heiko Schlittermann.
+
+PP/07 Make maildir_use_size_file an _expandable_ boolean.
+      Bugzilla 1089.  Patch from Heiko Schlittermann.
+
+PP/08 Handle ${run} returning more data than OS pipe buffer size.
+      Bugzilla 1131.  Patch from Holger Weiß.
+
+PP/09 Handle IPv6 addresses with SPF.
+      Bugzilla 860.  Patch from Wolfgang Breyha.
+
+PP/10 GnuTLS: support TLS 1.2 & 1.1.
+      Bugzilla 1156.
+      Use gnutls_certificate_verify_peers2() [patch from Andreas Metzler].
+      Bugzilla 1095.
+
+PP/11 match_* no longer expand right-hand-side by default.
+      New compile-time build option, EXPAND_LISTMATCH_RHS.
+      New expansion conditions, "inlist", "inlisti".
+
+PP/12 fix uninitialised greeting string from PP/03 (smtps client support).
+
+PP/13 shell and compiler warnings fixes for RC1-RC4 changes.
+
+PP/14 fix log_write() format string regression from TF/03.
+      Bugzilla 1152.  Patch from Dmitry Isaikin.
+
+
+Exim version 4.76
+-----------------
+
+PP/01 The new ldap_require_cert option would segfault if used.  Fixed.
+
+PP/02 Harmonised TLS library version reporting; only show if debugging.
+      Layout now matches that introduced for other libraries in 4.74 PP/03.
+
+PP/03 New openssl_options items: no_sslv2 no_sslv3 no_ticket no_tlsv1
+
+PP/04 New "dns_use_edns0" global option.
+
+PP/05 Don't segfault on misconfiguration of ref:name exim-user as uid.
+      Bugzilla 1098.
+
+PP/06 Extra paranoia around buffer usage at the STARTTLS transition.
+      nb: Exim is not vulnerable to http://www.kb.cert.org/vuls/id/555316
+
+TK/01 Updated PolarSSL code to 0.14.2.
+      Bugzilla 1097. Patch from Andreas Metzler.
+
+PP/07 Catch divide-by-zero in ${eval:...}.
+      Fixes bugzilla 1102.
+
+PP/08 Condition negation of bool{}/bool_lax{} did not negate.  Fixed.
+      Bugzilla 1104.
+
+TK/02 Bugzilla 1106: CVE-2011-1764 - DKIM log line was subject to a
+      format-string attack -- SECURITY: remote arbitrary code execution.
+
+TK/03 SECURITY - DKIM signature header parsing was double-expanded, second
+      time unintentionally subject to list matching rules, letting the header
+      cause arbitrary Exim lookups (of items which can occur in lists, *not*
+      arbitrary string expansion). This allowed for information disclosure.
+
+PP/09 Fix another SIGFPE (x86) in ${eval:...} expansion, this time related to
+      INT_MIN/-1 -- value coerced to INT_MAX.
+
+
+Exim version 4.75
+-----------------
+
+NM/01 Workaround for PCRE version dependency in version reporting
+      Bugzilla 1073
+
+TF/01 Update valgrind.h and memcheck.h to copies from valgrind-3.6.0.
+      This fixes portability to compilers other than gcc, notably
+      Solaris CC and HP-UX CC. Fixes Bugzilla 1050.
+
+TF/02 Bugzilla 139: Avoid using the += operator in the modular lookup
+      makefiles for portability to HP-UX and POSIX correctness.
+
+PP/01 Permit LOOKUP_foo enabling on the make command-line.
+      Also via indented variable definition in the Makefile.
+      (Debugging by Oliver Heesakkers).
+
+PP/02 Restore caching of spamd results with expanded spamd_address.
+      Patch from author of expandable spamd_address patch, Wolfgang Breyha.
+
+PP/03 Build issue: lookups-Makefile now exports LC_ALL=C
+      Improves build reliability.  Fix from: Frank Elsner
+
+NM/02 Fix wide character breakage in the rfc2047 coding
+      Fixes bug 1064. Patch from Andrey N. Oktyabrski
+
+NM/03 Allow underscore in dnslist lookups
+      Fixes bug 1026. Patch from Graeme Fowler
+
+PP/04 Bugzilla 230: Support TLS-enabled LDAP (in addition to ldaps).
+      Code patches from Adam Ciarcinski of NetBSD.
+
+NM/04 Fixed exiqgrep to cope with mailq missing size issue
+      Fixes bug 943.
+
+PP/05 Bugzilla 1083: when lookup expansion defers, escape the output which
+      is logged, to avoid truncation. Patch from John Horne.
+
+PP/06 Bugzilla 1042: implement freeze_signal on pipe transports.
+      Patch from Jakob Hirsch.
+
+PP/07 Bugzilla 1061: restrict error messages sent over SMTP to not reveal
+      SQL string expansion failure details.
+      Patch from Andrey Oktyabrski.
+
+PP/08 Bugzilla 486: implement %M datestamping in log filenames.
+      Patch from Simon Arlott.
+
+PP/09 New lookups functionality failed to compile on old gcc which rejects
+      extern declarations in function scope.
+      Patch from Oliver Fleischmann
+
+PP/10 Use sig_atomic_t for flags set from signal handlers.
+      Check getgroups() return and improve debugging.
+      Fixed developed for diagnosis in bug 927 (which turned out to be
+      a kernel bug).
+
+PP/11 Bugzilla 1055: Update $message_linecount for maildir_tag.
+      Patch from Mark Zealey.
+
+PP/12 Bugzilla 1056: Improved spamd server selection.
+      Patch from Mark Zealey.
+
+PP/13 Bugzilla 1086: Deal with maildir quota file races.
+      Based on patch from Heiko Schlittermann.
+
+PP/14 Bugzilla 1019: DKIM multiple signature generation fix.
+      Patch from Uwe Doering, sign-off by Michael Haardt.
+
+NM/05 Fix to spam.c to accommodate older gcc versions which dislike
+      variable declaration deep within a block.  Bug and patch from
+      Dennis Davis.
+
+PP/15 lookups-Makefile IRIX compatibility coercion.
+
+PP/16 Make DISABLE_DKIM build knob functional.
+
+NM/06 Bugzilla 968: child_open_uid: restore default SIGPIPE handler
+      Patch by Simon Arlott
+
+TF/03 Fix valgrind.h portability to C89 compilers that do not support
+      variable argument macros. Our copy now differs from upstream.
+
+
+Exim version 4.74
+-----------------
+
+TF/01 Failure to get a lock on a hints database can have serious
+      consequences so log it to the panic log.
+
+TF/02 Log LMTP confirmation messages in the same way as SMTP,
+      controlled using the smtp_confirmation log selector.
+
+TF/03 Include the error message when we fail to unlink a spool file.
+
+DW/01 Bugzilla 139: Support dynamically loaded lookups as modules.
+      With thanks to Steve Haslam, Johannes Berg & Serge Demonchaux
+      for maintaining out-of-tree patches for some time.
+
+PP/01 Bugzilla 139: Documentation and portability issues.
+      Avoid GNU Makefile-isms, let Exim continue to build on BSD.
+      Handle per-OS dynamic-module compilation flags.
+
+PP/02 Let /dev/null have normal permissions.
+      The 4.73 fixes were a little too stringent and complained about the
+      permissions on /dev/null.  Exempt it from some checks.
+      Reported by Andreas M. Kirchwitz.
+
+PP/03 Report version information for many libraries, including
+      Exim version information for dynamically loaded libraries.  Created
+      version.h, now support a version extension string for distributors
+      who patch heavily. Dynamic module ABI change.
+
+PP/04 CVE-2011-0017 - check return value of setuid/setgid. This is a
+      privilege escalation vulnerability whereby the Exim run-time user
+      can cause root to append content of the attacker's choosing to
+      arbitrary files.
+
+PP/05 Bugzilla 1041: merged DCC maintainer's fixes for return code.
+      (Wolfgang Breyha)
+
+PP/06 Bugzilla 1071: fix delivery logging with untrusted macros.
+      If dropping privileges for untrusted macros, we disabled normal logging
+      on the basis that it would fail; for the Exim run-time user, this is not
+      the case, and it resulted in successful deliveries going unlogged.
+      Fixed.  Reported by Andreas Metzler.
+
+
+Exim version 4.73
+-----------------
+
+PP/01 Date: & Message-Id: revert to normally being appended to a message,
+      only prepend for the Resent-* case.  Fixes regression introduced in
+      Exim 4.70 by NM/22 for Bugzilla 607.
+
+PP/02 Include check_rfc2047_length in configure.default because we're seeing
+      increasing numbers of administrators be bitten by this.
+
+JJ/01 Added DISABLE_DKIM and comment to src/EDITME
+
+PP/03 Bugzilla 994: added openssl_options main configuration option.
+
+PP/04 Bugzilla 995: provide better SSL diagnostics on failed reads.
+
+PP/05 Bugzilla 834: provide a permit_coredump option for pipe transports.
+
+PP/06 Adjust NTLM authentication to handle SASL Initial Response.
+
+PP/07 If TLS negotiated an anonymous cipher, we could end up with SSL but
+      without a peer certificate, leading to a segfault because of an
+      assumption that peers always have certificates.  Be a little more
+      paranoid.  Problem reported by Martin Tscholak.
+
+PP/08 Bugzilla 926: switch ClamAV to use the new zINSTREAM API for content
+      filtering; old API available if built with WITH_OLD_CLAMAV_STREAM=yes
+      NB: ClamAV planning to remove STREAM in "middle of 2010".
+      CL also introduces -bmalware, various -d+acl logging additions and
+      more caution in buffer sizes.
+
+PP/09 Implemented reverse_ip expansion operator.
+
+PP/10 Bugzilla 937: provide a "debug" ACL control.
+
+PP/11 Bugzilla 922: Documentation dusting, patch provided by John Horne.
+
+PP/12 Bugzilla 973: Implement --version.
+
+PP/13 Bugzilla 752: Refuse to build/run if Exim user is root/0.
+
+PP/14 Build without WITH_CONTENT_SCAN. Path from Andreas Metzler.
+
+PP/15 Bugzilla 816: support multiple condition rules on Routers.
+
+PP/16 Add bool_lax{} expansion operator and use that for combining multiple
+      condition rules, instead of bool{}.  Make both bool{} and bool_lax{}
+      ignore trailing whitespace.
+
+JJ/02 prevent non-panic DKIM error from being sent to paniclog
+
+JJ/03 added tcp_wrappers_daemon_name to allow host entries other than
+      "exim" to be used
+
+PP/17 Fix malware regression for cmdline scanner introduced in PP/08.
+      Notification from Dr Andrew Aitchison.
+
+PP/18 Change ClamAV response parsing to be more robust and to handle ClamAV's
+      ExtendedDetectionInfo response format.
+      Notification from John Horne.
+
+PP/19 OpenSSL 1.0.0a compatibility const-ness change, should be backwards
+      compatible.
+
+PP/20 Added a CONTRIBUTING file.  Fixed the documentation build to use http:
+      XSL and documented dependency on system catalogs, with examples of how
+      it normally works.
+
+DW/21 Added Valgrind hooks in store.c to help it capture out-of-bounds store
+      access.
+
+DW/22 Bugzilla 1044: CVE-2010-4345 - partial fix: restrict default behaviour
+      of CONFIGURE_OWNER and CONFIGURE_GROUP options to no longer allow a
+      configuration file which is writeable by the Exim user or group.
+
+DW/23 Bugzilla 1044: CVE-2010-4345 - part two: extend checks for writeability
+      of configuration files to cover files specified with the -C option if
+      they are going to be used with root privileges, not just the default
+      configuration file.
+
+DW/24 Bugzilla 1044: CVE-2010-4345 - part three: remove ALT_CONFIG_ROOT_ONLY
+      option (effectively making it always true).
+
+DW/25 Add TRUSTED_CONFIG_PREFIX_FILE option to allow alternative configuration
+      files to be used while preserving root privileges.
+
+DW/26 Set FD_CLOEXEC on SMTP sockets after forking in the daemon, to ensure
+      that rogue child processes cannot use them.
+
+PP/27 Bugzilla 1047: change the default for system_filter_user to be the Exim
+      run-time user, instead of root.
+
+PP/28 Add WHITELIST_D_MACROS option to let some macros be overridden by the
+      Exim run-time user without dropping privileges.
+
+DW/29 Remove use of va_copy() which breaks pre-C99 systems. Duplicate the
+      result string, instead of calling string_vformat() twice with the same
+      arguments.
+
+DW/30 Allow TRUSTED_CONFIG_PREFIX_FILE only for Exim or CONFIGURE_OWNER, not
+      for other users. Others should always drop root privileges if they use
+      -C on the command line, even for a whitelisted configure file.
+
+DW/31 Turn TRUSTED_CONFIG_PREFIX_FILE into TRUSTED_CONFIG_FILE. No prefixes.
+
+NM/01 Fixed bug #1002 - Message loss when using multiple deliveries
+
+
+Exim version 4.72
+-----------------
+
+JJ/01 installed exipick 20100104.1, adding $max_received_linelength,
+      $data_path, and $header_path variables; fixed documentation bugs and
+      typos
+
+JJ/02 installed exipick 20100222.0, added --input-dir and --finput to allow
+      exipick to access non-standard spools, including the "frozen" queue
+      (Finput)
+
+NM/01 Bugzilla 965: Support mysql stored procedures.
+      Patch from Alain Williams
+
+NM/02 Bugzilla 961: Spacing fix (syntax error) on Makefile directives for NetBSD
+
+NM/03 Bugzilla 955: Documentation fix for max_rcpts.
+      Patch from Andreas Metzler
+
+NM/04 Bugzilla 954: Fix for unknown responses from Dovecot authenticator.
+      Patch from Kirill Miazine
+
+NM/05 Bugzilla 671: Added umask to procmail example.
+
+JJ/03 installed exipick 20100323.0, fixing doc bug
+
+NM/06 Bugzilla 988: CVE-2010-2023 - prevent hardlink attack on sticky mail
+      directory.  Notification and patch from Dan Rosenberg.
+
+TK/01 PDKIM: Upgrade PolarSSL files to upstream version 0.12.1.
+
+TK/02 Improve log output when DKIM signing operation fails.
+
+MH/01 Treat the transport option dkim_domain as a colon separated
+      list, not as a single string, and sign the message with each element,
+      omitting multiple occurences of the same signer.
+
+NM/07 Null terminate DKIM strings, Null initialise DKIM variable
+      Bugzilla 985, 986.  Patch by Simon Arlott
+
+NM/08 Bugzilla 967. dnsdb DNS TXT record bug fix (DKIM-related)
+      Patch by Simon Arlott
+
+PP/01 Bugzilla 989: CVE-2010-2024 - work round race condition on
+      MBX locking.  Notification from Dan Rosenberg.
+
+
+Exim version 4.71
+-----------------
+
+TK/01 Bugzilla 912: Fix DKIM segfault on empty headers/body.
+
+NM/01 Bugzilla 913: Documentation fix for gnutls_* options.
+
+NM/02 Bugzilla 722: Documentation for randint.  Better randomness defaults.
+
+NM/03 Bugzilla 847: Enable DNSDB lookup by default.
+
+NM/04 Bugzilla 915: Flag broken perl installation during build.
+
+
+Exim version 4.70
+-----------------
+
+TK/01 Added patch by Johannes Berg that expands the main option
+      "spamd_address" 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.
+
+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).
+
+NM/05.2 Bugzilla 437: Prevent Maildir aux files being created with mode 000.
+
+NM/05.3 Bugzilla 598: Improvement to Dovecot authenticator handling.
+      Patch provided by Jan Srzednicki.
+
+TF/05 Leading white space used to be stripped from $spam_report which
+      wrecked the formatting. Now it is preserved.
+
+TF/06 Save $spam_score, $spam_bar, and $spam_report in spool files, so
+      that they are available at delivery time.
+
+TF/07 Fix the way ${extract is skipped in the untaken branch of a conditional.
+
+TF/08 TLS error reporting now respects the incoming_interface and
+      incoming_port log selectors.
+
+TF/09 Produce a more useful error message if an SMTP transport's hosts
+      setting expands to an empty string.
+
+NM/06 Bugzilla 744: EXPN did not work under TLS.
+      Patch provided by Phil Pennock.
+
+NM/07 Bugzilla 769: Extraneous comma in usage fprintf
+      Patch provided by Richard Godbee.
+
+NM/08 Fixed erroneous documentation references to smtp_notquit_acl to be
+      acl_smtp_notquit, added index entry.
+
+NM/09 Bugzilla 787: Potential buffer overflow in string_format.
+      Patch provided by Eugene Bujak.
+
+NM/10 Bugzilla 770: Problem on some platforms modifying the len parameter to
+      accept(). Patch provided by Maxim Dounin.
+
+NM/11 Bugzilla 749: Preserve old behaviour of blanks comparing equal to zero.
+      Patch provided by Phil Pennock.
+
+NM/12 Bugzilla 497: Correct behaviour of exiwhat when no config exists.
+
+NM/13 Bugzilla 590: Correct handling of Resent-Date headers.
+      Patch provided by Brad "anomie" Jorsch.
+
+NM/14 Bugzilla 622: Added timeout setting to transport filter.
+      Patch provided by Dean Brooks.
+
+TK/05 Add native DKIM support (does not depend on external libraries).
+
+NM/15 Bugzilla 854: Removed code that symlinks to pcre as its no longer useful.
+      Patch provided by Graeme Fowler.
+
+NM/16 Bugzilla 851: Documentation example syntax fix.
+
+NM/17 Changed NOTICE file to remove references to embedded PCRE.
+
+NM/18 Bugzilla 894: Fix issue with very long lines including comments in
+      lsearch.
+
+NM/19 Bugzilla 745: TLS version reporting.
+      Patch provided by Phil Pennock.
+
+NM/20 Bugzilla 167: bool: condition support.
+      Patch provided by Phil Pennock.
+
+NM/21 Bugzilla 665: gnutls_compat_mode to allow compatibility with broken
+      clients. Patch provided by Phil Pennock.
+
+NM/22 Bugzilla 607: prepend (not append) Resent-Message-ID and Resent-Date.
+      Patch provided by Brad "anomie" Jorsch.
+
+NM/23 Bugzilla 687: Fix misparses in eximstats.
+      Patch provided by Heiko Schlittermann.
+
+NM/24 Bugzilla 688: Fix exiwhat to handle log_selector = +pid.
+      Patch provided by Heiko Schlittermann.
+
+NM/25 Bugzilla 727: Use transport mode as default mode for maildirsize file.
+      plus update to original patch.
+
+NM/26 Bugzilla 799: Documentation correction for ratelimit.
+
+NM/27 Bugzilla 802: Improvements to local interface IP addr detection.
+      Patch provided by David Brownlee.
+
+NM/28 Bugzilla 807: Improvements to LMTP delivery logging.
+
+NM/29 Bugzilla 862, 866, 875: Documentation bugfixes.
+
+NM/30 Bugzilla 888: TLS documentation bugfixes.
+
+NM/31 Bugzilla 896: Dovecot buffer overrun fix.
+
+NM/32 Bugzilla 889: Change all instances of "expr" in shell scripts to "expr --"
+      Unlike the original bugzilla I have changed all shell scripts in src tree.
+
+NM/33 Bugzilla 898: Transport filter timeout fix.
+      Patch by Todd Rinaldo.
+
+NM/34 Bugzilla 901: Fix sign/unsigned and UTF mismatches.
+      Patch by Serge Demonchaux.
+
+NM/35 Bugzilla 39: Base64 decode bug fixes.
+      Patch by Jakob Hirsch.
+
+NM/36 Bugzilla 909: Correct connect() call in dcc code.
+
+NM/37 Bugzilla 910: Correct issue with relaxed/simple handling.
+
+NM/38 Bugzilla 908: Removed NetBSD3 support as no longer needed.
+
+NM/39 Bugzilla 911: Fixed MakeLinks build script.
+
+
+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 anomalous, 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 responses 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 particular, 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
+      whitespace 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 output 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 determined 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 messages, 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
+-----------------
+
+TK/01 Added the "success_on_redirect" address verification option. See
+      NewStuff for rationale and an example.
+
+PH/01 Added support for SQLite, basic code supplied by David Woodhouse.
+
+PH/02 Patch to exigrep to allow it to work on syslog lines.
+
+PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
+      fread() to skip over the body file's header line, because in Cygwin the
+      header line is locked and is inaccessible.
+
+PH/04 Added $message_exim_id, ultimately to replace $message_id (they will both
+      co-exist for some time) to make it clear that it is the Exim ID that is
+      referenced, not the Message-ID: header line.
+
+PH/05 Replaced all Tom's calls to snprintf() with calls to the internal
+      string_format() function, because snprintf() does not exist on all
+      operating systems.
+
+PH/06 The use of forbid_filter_existstest now also locks out the use of the
+      ${stat: expansion item.
+
+PH/07 Changed "SMTP protocol violation: synchronization error" into "SMTP
+      protocol synchronization error", to keep the pedants happy.
+
+PH/08 Arrange for USE_INET_NTOA_FIX to be set in config.h for AIX systems as
+      well as for IRIX systems, when gcc is being used. See the host.c source
+      file for comments.
+
+PH/09 Installed latest Cygwin configuration files from the Cygwin maintainer.
+
+PH/10 Named domain lists were not working if used in a queue_smtp_domains
+      setting.
+
+PH/11 Added support for the IGNOREQUOTA extension to LMTP, both to the lmtp
+      transport and to the smtp transport in LMTP mode.
+
+TK/02 Remove one case of BASE64 error detection FTTB (undocumented anyway).
+
+PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
+      run a filter in a subprocess. This could lead to confusion in subsequent
+      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
+-----------------
+
+TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
+
+PH/01 When a transport filter timed out in a pipe delivery, and the pipe
+      command itself ended in error, the underlying message about the transport
+      filter timeout was being overwritten with the pipe command error. Now the
+      underlying error message should be appended to the second error message.
+
+TK/01 Fix poll() being unavailable on Mac OSX 10.2.
+
+PH/02 Reduce the amount of output that "make" produces by default. Full output
+      can still be requested.
+
+PH/03 The warning log line about a condition test deferring for a "warn" verb
+      was being output only once per connection, rather than after each
+      occurrence (because it was using the same function as for successful
+      "warn" verbs). This seems wrong, so I have changed it.
+
+TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
+      it should not have, which might have caused a crash in the right
+      circumstances, but probably never did.
+
+PH/04 Installed a modified version of Tony Finch's patch to make submission
+      mode fix the return path as well as the Sender: header line, and to
+      add a /name= option so that you can make the user's friendly name appear
+      in the header line.
+
+TF/03 Added the control = fakedefer ACL modifier.
+
+TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
+      Mark Lowes for thorough testing.
+
+TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
+
+TK/03 Merged latest SRS patch from Miles Wilton.
+
+PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
+      with the definition in sysexits.h (which is #included earlier).
+      Fortunately, Exim does not actually use EX_OK. The code used to try to
+      preserve the sysexits.h value, by assuming that macro definitions were
+      scanned for macro replacements. I have been disabused of this notion,
+      so now the code just undefines EX_OK before #including unistd.h.
+
+PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
+      in the smtp transport. When a block could not be written in a single
+      write() function, the timeout was being re-applied to each part-write.
+      This seems wrong - if the receiver was accepting one byte at a time it
+      would take for ever. The timeout is now adjusted when this happens. It
+      doesn't have to be particularly precise.
+
+TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
+      details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
+
+PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
+      without a domain if the check to <postmaster@domain> fails.
+
+SC/01 Eximstats: added -xls and the ability to specify output files
+     (patch written by Frank Heydlauf).
+
+SC/02 Eximstats: use FileHandles for outputting results.
+
+SC/03 Eximstats: allow any combination of xls, txt, and html output.
+
+SC/04 Eximstats: fixed display of large numbers with -nvr option
+
+SC/05 Eximstats: fixed merging of reports with empty tables.
+
+SC/06 Eximstats: added the -include_original_destination flag
+
+SC/07 Eximstats: removed tabs and trailing whitespace.
+
+TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
+
+TK/06 MBOX spool code: Add real "From " MBOX separator line
+      so the .eml file is really in mbox format (even though
+      most programs do not really care). Patch from Alex Miller.
+
+TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
+      The latter is generated from $received_to and is only set if the
+      message has one envelope recipient. SA can use these headers,
+      obviously out-of-the-box. Patch from Alex Miller.
+
+PH/08 The ${def test on a variable was returning false if the variable's
+      value was "0", contrary to what the specification has always said!
+      The result should be true unless the variable is empty.
+
+PH/09 The syntax error of a character other than { following "${if
+      def:variable_name" (after optional whitespace) was not being diagnosed.
+      An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
+      accidental colon was present, for example, could give incorrect results.
+
+PH/10 Tidied the code in a number of places where the st_size field of a stat()
+      result is used (not including appendfile, where other changes are about
+      to be made).
+
+PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
+      This involved changing a lot of size variables from int to off_t. It
+      should work with maildirs and everything.
+
+TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
+      spamd dying while we are connected to it.
+
+TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
+      <jgh@wizmail.org>
+
+PH/12 Applied Alex Kiernan's patch for the API change for the error callback
+      function for BDB 4.3.
+
+PH/13 Changed auto_thaw such that it does not apply to bounce messages.
+
+PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
+      the sources for PCRE have been re-arranged and more files are now
+      involved.
+
+PH/15 The code I had for printing potentially long long variables in PH/11
+      above was not the best (it lost precision). The length of off_t variables
+      is now inspected at build time, and an appropriate printing format (%ld
+      or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
+      to be "long long int" or "long int". This is needed for the internal
+      formatting function string_vformat().
+
+PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
+      the configuration file to be ":syslog", then the script "guesses" where
+      the logs files are, rather than using the compiled in default. In our
+      case the guess is not the same as the compiled default, so the script
+      suddenly stopped working when I started to use syslog. The patch checks
+      to see if log_file_path is "". If so, it attempts to read it from exim
+      with no configuration file to get the compiled in version, before it
+      falls back to the previous guessing code."
+
+TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
+      implementing BATV in an Exim configuration. See NewStuff for the gory
+      details.
+
+PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
+      Makefile that are specific to HP-UX.
+
+PH/18 If the "use_postmaster" option was set for a recipient callout together
+      with the "random" option, the postmaster address was used as the MAIL
+      FROM address for the random test, but not for the subsequent recipient
+      test. It is now used for both.
+
+PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
+      patch removes a few documentation additions to RFC 3028, because the
+      latest draft now contains them. It adds the new en;ascii-case comparator
+      and a new error check for 8bit text in MIME parts. Comparator and
+      require names are now matched exactly. I enabled the subaddress
+      extension, but it is not well tested yet (read: it works for me)."
+
+PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
+      rework some of the code of TK/09 above to avoid the hardwired use of
+      "%lld" and "long long". Replaced the call to snprintf() with a call to
+      string_vformat().
+
+PH/21 Added some other messages to those in 4.51/PH/42, namely "All relevant MX
+      records point to non-existent hosts", "retry timeout exceeded", and
+      "retry time not reached for any host after a long failure period".
+
+PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
+      experimental DomainKeys support:
+
+      (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
+      (2) On an error such as an illegally used "control", the wrong name for
+          the control was given.
+
+      These problems did NOT occur unless DomainKeys support was compiled.
+
+PH/23 Added daemon_startup_retries and daemon_startup_sleep.
+
+PH/24 Added ${if match_ip condition.
+
+PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
+      databases so that it will be absolutely obvious if a crash occurs in the
+      DB library. This is a regular occurrence (often caused by mis-matched
+      db.h files).
+
+PH/26 Insert a lot of missing (void) casts for functions such as chown(),
+      chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
+      picked up on a user's system that detects such things. There doesn't seem
+      to be a gcc warning option for this - only an attribute that has to be
+      put on the function's prototype. It seems that in Fedora Core 4 they have
+      set this on a number of new functions. No doubt there will be more in due
+      course.
+
+PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
+      specify a transport. However, if an address that was verified by such a
+      router was the subject of a callout, Exim crashed because it tried to
+      read the rcpt_include_affixes from the non-existent transport. Now it
+      just assumes that the setting of that option is false. This bug was
+      introduced by 4.51/PH/31.
+
+PH/28 Changed -d+all to exclude +memory, because that information is very
+      rarely of interest, but it makes the output a lot bigger. People tend to
+      do -d+all out of habit.
+
+PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
+      code in os-type was giving problems when libc.so lives in lib64, like on
+      x86_64 Fedora Core.
+
+PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
+      aren't the modern standard, and it seems that some systems' include files
+      don't always have them. Exim was already checking for some of the newer
+      ones like T_AAAA, and defining it itself. I've added checks for all the
+      record types that Exim uses.
+
+PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
+      not automatically generating a new one, as it is supposed to. This
+      prevented TLS from working. If the file did exist, but contained invalid
+      data, a new version was generated, as expected. It was only the case of a
+      non-existent file that was broken.
+
+TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
+      with a change in libdomainkeys > 0.64.
+
+TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
+      from DNS. If the selector record carries the flag, it now has
+      precedence over the domain-wide flag.
+
+TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.
+
+PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
+      the use of a port name that isn't defined in /etc/services) occurred, the
+      message was deferred as in a normal delivery, and thus remained on the
+      spool, instead of being failed because of the mua_wrapper setting. This
+      is now fixed, and I tidied up some of the mua_wrapper messages at the
+      same time.
+
+SC/08 Eximstats: whilst parsing the mainlog(s), store information about
+      the messages in a hash of arrays rather than using individual hashes.
+      This is a bit cleaner and results in dramatic memory savings, albeit
+      at a slight CPU cost.
+
+SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
+      as requested by Marc Sherman.
+
+SC/10 Eximstats: added histograms for user specified patterns as requested
+      by Marc Sherman.
+
+SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.
+
+PH/33 Patch from the Cygwin maintainer to add "b" to all occurences of
+      fopen() in the content-scanning modules that did not already have it.
+
+
+Exim version 4.51
+-----------------
+
+TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
+      doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
+
+TK/02 Fix ACL "control" statement not being available in MIME ACL.
+
+TK/03 Fix ACL "regex" condition not being available in MIME ACL.
+
+PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
+      to test Sieve filters that use "vacation".
+
+PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
+      that changes the way the GnuTLS parameters are stored in the cache file.
+      The new format can be generated externally. For backward compatibility,
+      if the data in the cache doesn't make sense, Exim assumes it has read an
+      old-format file, and it generates new data and writes a new file. This
+      means that you can't go back to an older release without removing the
+      file.
+
+PH/03 A redirect router that has both "unseen" and "one_time" set does not
+      work if there are any delivery delays because "one_time" forces the
+      parent to be marked "delivered", so its unseen clone is never tried
+      again. For this reason, Exim now forbids the simultaneous setting of
+      these two options.
+
+PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
+      redirected to themselves ("homonym" addresses). Read the long ChangeLog
+      entry if you want to know the details. The fix, however, neglected to
+      consider the case when local delivery batching is involved. The test for
+      "previously delivered" was not happening when checking to see if an
+      address could be batched with a previous (undelivered) one; under
+      certain circumstances this could lead to multiple deliveries to the same
+      address.
+
+PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
+      in its include files, and this causes problems building Exim.
+
+PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
+      header_syntax) but Exim was just ignoring anything given after a slash.
+      In particular, this caused confusion with an attempt to use "verify =
+      reverse_host_lookup/defer_ok". An error is now given when options are
+      supplied for verify items that do not have them. (Maybe reverse_host_
+      lookup should have a defer_ok option, but that's a different point.)
+
+PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
+      defined by RFC 821) to 2048, because there were problems with some AUTH
+      commands, and RFC 1869 says the size should be increased for extended
+      SMTP commands that take arguments.
+
+PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
+      Finch).
+
+PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
+      "unknown" error; now it says that the functionality isn't in the binary.
+
+PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
+      an address' error message when a string expansion fails (syntax or
+      whatever). Otherwise the password may appear in the log. Following change
+      PH/42 below, there is no longer a chance of it appearing in a bounce
+      message.
+
+PH/11 Installed exipick version 20050225.0 from John Jetmore.
+
+PH/12 If the last host in a fallback_hosts list was multihomed, only the first
+      of its addresses was ever tried. (Bugzilla bug #2.)
+
+PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
+      the result incorrectly in the debug output. (It correctly added a newline
+      to what was transported.)
+
+TF/01 Added $received_time.
+
+PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
+      commented out examples of how to interface to a virus scanner and to
+      SpamAssassin. Also added commented examples of av_scanner and
+      spamd_address settings.
+
+PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
+      and controls are allowed in which ACLs. There were a couple of minor
+      errors. Some of the entries in the conditions table (which is a table of
+      where they are NOT allowed) were getting very unwieldy; rewrote them as a
+      negation of where the condition IS allowed.
+
+PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
+
+PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
+      header file does not have a version number, so I've had to invent a new
+      value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
+      API. The code is untested by me (my Linux distribution still has 0.3.2 of
+      radiusclient), but it was contributed by a Radius user.
+
+PH/18 Installed Lars Mainka's patch for the support of CRL collections in
+      files or directories, for OpenSSL.
+
+PH/19 When an Exim process that is running as root has to create an Exim log
+      file, it does so in a subprocess that runs as exim:exim so as to get the
+      ownership right at creation (otherwise, other Exim processes might see
+      the file with the wrong ownership). There was no test for failure of this
+      fork() call, which would lead to the process getting stuck as it waited
+      for a non-existent subprocess. Forks do occasionally fail when resources
+      run out. I reviewed all the other calls to fork(); they all seem to check
+      for failure.
+
+PH/20 When checking for unexpected SMTP input at connect time (before writing
+      the banner), Exim was not dealing correctly with a non-positive return
+      from the read() function. If the client had disconnected by this time,
+      the result was a log entry for a synchronization error with an empty
+      string after "input=" when read() returned zero. If read() returned -1
+      (an event I could not check), uninitialized data bytes were printed.
+      There were reports of junk text (parts of files, etc) appearing after
+      "input=".
+
+PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
+
+PH/22 Added support for macro redefinition, and (re)definition in between
+      driver and ACL definitions.
+
+PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
+      forgetting to use the resulting value; it was using the unexpanded value.
+
+PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
+      hadn't been configured. The fix is from Juergen Kreileder, who
+      understands it better than I do:
+
+      "Here's what I see happening with three configured cyrus_sasl
+      authenticators configured (plain, login, cram-md5):
+
+      On startup auth_cyrus_sasl_init() gets called for each of these.
+      This means three calls to sasl_listmech() without a specified mech_list.
+      => SASL tests which mechs of all available mechs actually work
+      => three warnings about OTP not working
+      => the returned list contains: plain, login, cram-md5, digest-md5, ...
+
+      With the patch, sasl_listmech() also gets called three times.  But now
+      SASL's mech_list option is set to the server_mech specified in the the
+      authenticator.  Or in other words, the answer from sasl_listmech()
+      gets limited to just the mech you're testing for (which is different
+      for each call.)
+      => the return list contains just 'plain' or 'login', 'cram-md5' or
+      nothing depending on the value of ob->server_mech.
+
+      I've just tested the patch: Authentication still works fine,
+      unavailable mechs specified in the exim configuration are still
+      caught, and the auth.log warnings about OTP are gone."
+
+PH/25 When debugging is enabled, the contents of the command line are added
+      to the debugging output, even when log_selector=+arguments is not
+      specified.
+
+PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
+      answer is "GNU", and only if the return is "GNU/something" is the answer
+      "Linux".
+
+PH/27 $acl_verify_message is now set immediately after the failure of a
+      verification in an ACL, and so is available in subsequent modifiers. In
+      particular, the message can be preserved by coding like this:
+
+         warn  !verify = sender
+               set acl_m0 = $acl_verify_message
+
+      Previously, $acl_verify_message was set only while expanding "message"
+      and "log_message" when a very denied access.
+
+PH/28 Modified OS/os.c-Linux with
+
+        -#ifndef OS_LOAD_AVERAGE
+        +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
+
+      to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
+      nomenclature these days.)
+
+PH/29 Installed patch from the Sieve maintainer that adds the options
+      sieve_useraddress and sieve_subaddress to the redirect router.
+
+PH/30 In these circumstances:
+        . Two addresses routed to the same list of hosts;
+        . First host does not offer TLS;
+        . First host accepts first address;
+        . First host gives temporary error to second address;
+        . Second host offers TLS and a TLS session is established;
+        . Second host accepts second address.
+      Exim incorrectly logged both deliveries with the TLS parameters (cipher
+      and peerdn, if requested) that were in fact used only for the second
+      address.
+
+PH/31 When doing a callout as part of verifying an address, Exim was not paying
+      attention to any local part prefix or suffix that was matched by the
+      router that accepted the address. It now behaves in the same way as it
+      does for delivery: the affixes are removed from the local part unless
+      rcpt_include_affixes is set on the transport.
+
+PH/32 Add the sender address, as F=<...>, to the log line when logging a
+      timeout during the DATA phase of an incoming message.
+
+PH/33 Sieve envelope tests were broken for match types other than :is. I have
+      applied a patch sanctioned by the Sieve maintainer.
+
+PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
+      the uid or gid is negative. A case of a negative gid caused this to be
+      noticed. The fix allows for either to be negative.
+
+PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
+      clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
+      overlooked.
+
+PH/36 The change PH/12 above was broken. Fixed it.
+
+PH/37 Exim used to check for duplicate addresses in the middle of routing, on
+      the grounds that routing the same address twice would always produce the
+      same answer. This might have been true once, but it is certainly no
+      longer true now. Routing a child address may depend on the previous
+      routing that produced that child. Some complicated redirection strategies
+      went wrong when messages had multiple recipients, and made Exim's
+      behaviour dependent on the order in which the addresses were given.
+
+      I have moved the duplicate checking until after the routing is complete.
+      Exim scans the addresses that are assigned to local and remote
+      transports, and removes any duplicates. This means that more work will be
+      done, as duplicates will always all be routed, but duplicates are
+      presumably rare, so I don't expect this is of any significance.
+
+      For deliveries to pipes, files, and autoreplies, the duplicate checking
+      still happens during the routing process, since they are not going to be
+      routed further.
+
+PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
+      It corrects a timeout issue with spamd. This is Ian's comment: "The
+      background is that sometimes spamd either never reads data from a
+      connection it has accepted, or it never writes response data. The exiscan
+      spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
+      blindly assumes that writes won't block so it may never time out."
+
+PH/39 Allow G after quota size as well as K and M.
+
+PH/40 The value set for $authenticated_id in an authenticator may not contain
+      binary zeroes or newlines because the value is written to log lines and
+      to spool files. There was no check on this. Now the value is run through
+      the string_printing() function so that such characters are converted to
+      printable escape sequences.
+
+PH/41 $message_linecount is a new variable that contains the total number of
+      lines in the message. Compare $body_linecount, which is the count for the
+      body only.
+
+PH/42 Exim no longer gives details of delivery errors for specific addresses in
+      bounce and delay warning messages, except in certain special cases, which
+      are as follows:
+
+      (a) An SMTP error message from a remote host;
+      (b) A message specified in a :fail: redirection;
+      (c) A message specified in a "fail" command in a system filter;
+      (d) A message specified in a FAIL return from the queryprogram router;
+      (e) A message specified by the cannot_route_message router option.
+
+      In these cases only, Exim does include the error details in bounce and
+      warning messages. There are also a few cases where bland messages such
+      as "unrouteable address" or "local delivery error" are given.
+
+PH/43 $value is now also set for the "else" part of a ${run expansion.
+
+PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
+      being worked on, but at least Exim now implements the latest version to
+      play with."
+
+PH/45 In a pipe transport, although a timeout while waiting for the pipe
+      process to complete was treated as a delivery failure, a timeout while
+      writing the message to the pipe was logged, but erroneously treated as a
+      successful delivery. Such timeouts include transport filter timeouts. For
+      consistency with the overall process timeout, these timeouts are now
+      treated as errors, giving rise to delivery failures by default. However,
+      there is now a new Boolean option for the pipe transport called
+      timeout_defer, which, if set TRUE, converts the failures into defers for
+      both kinds of timeout. A transport filter timeout is now identified in
+      the log output.
+
+PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
+      systems where "make" and "gmake" are different, calling "gmake" at top
+      level broke things. I've arranged for the value of $(MAKE) to be passed
+      from the Makefile to this script so that it can call the same version of
+      "make".
+
+
+A note about Exim versions 4.44 and 4.50
+----------------------------------------
+
+Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
+changes of various kinds. As a consequence, a big documentation update was
+needed. This delayed the release for rather longer than seemed good, especially
+in the light of a couple of (minor) security issues. Therefore, the changes
+that fixed bugs were backported into 4.43, to create a 4.44 maintenance
+release. So 4.44 and 4.50 are in effect two different branches that both start
+from 4.43.
+
+I have left the 4.50 change log unchanged; it contains all the changes since
+4.43. The change log for 4.44 is below; many of its items are identical to
+those for 4.50. This seems to be the most sensible way to preserve the
+historical information.
+
+
+Exim version 4.50
+-----------------
+
+ 1. Minor wording change to the doc/README.SIEVE file.
+
+ 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
+    computation of the current number of files was incorrect.
+
+ 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
+    bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
+    place.
+
+ 4. Give more explanation in the error message when the command for a transport
+    filter fails to execute.
+
+ 5. There are several places where Exim runs a non-Exim command in a
+    subprocess. The SIGUSR1 signal should be disabled for these processes. This
+    was being done only for the command run by the queryprogram router. It is
+    now done for all such subprocesses. The other cases are: ${run, transport
+    filters, and the commands run by the lmtp and pipe transports.
+
+ 6. Added CONFIGURE_GROUP build-time option.
+
+ 7. Some older OS have a limit of 256 on the maximum number of file
+    descriptors. Exim was using setrlimit() to set 1000 as a large value
+    unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
+    systems. I've change it so that if it can't get 1000, it tries for 256.
+
+ 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
+    was an oversight, and furthermore, ever since the addition of extra
+    controls (e.g. 4.43/32), the checks on when to allow different forms of
+    "control" were broken. There should now be diagnostics for all cases when a
+    control that does not make sense is encountered.
+
+ 9. Added the /retain_sender option to "control=submission".
+
+10. $recipients is now available in the predata ACL (oversight).
+
+11. Tidy the search cache before the fork to do a delivery from a message
+    received from the command line. Otherwise the child will trigger a lookup
+    failure and thereby defer the delivery if it tries to use (for example) a
+    cached ldap connection that the parent has called unbind on.
+
+12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
+    of $address_data from the recipient verification was clobbered by the
+    sender verification.
+
+13. The value of address_data from a sender verification is now available in
+    $sender_address_data in subsequent conditions in the ACL statement.
+
+14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
+
+15. Added a new option "connect=<time>" to callout options, to set a different
+    connection timeout.
+
+16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
+    was its contents. (It was OK if the option was not defined at all.)
+
+17. A "Completed" log line is now written for messages that are removed from
+    the spool by the -Mrm option.
+
+18. New variables $sender_verify_failure and $recipient_verify_failure contain
+    information about exactly what failed.
+
+19. Added -dd to debug only the daemon process.
+
+20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
+    handles timeouts, both on the server side and network timeouts. Renamed the
+    CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
+
+21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
+    It is now set to "smtps".
+
+22. $host_address is now set to the target address during the checking of
+    ignore_target_hosts.
+
+23. When checking ignore_target_hosts for an ipliteral router, no host name was
+    being passed; this would have caused $sender_host_name to have been used if
+    matching the list had actually called for a host name (not very likely,
+    since this list is usually IP addresses). A host name is now passed as
+    "[x.x.x.x]".
+
+24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
+    code that specifies a non-restarting handler (typically sigaction() in
+    modern systems) in an attempt to fix a rare and obscure crash bug.
+
+25. Narrowed the window for a race in the daemon that could cause it to ignore
+    SIGCHLD signals. This is not a major problem, because they are used only to
+    wake it up if nothing else does.
+
+26. A malformed maildirsize file could cause Exim to calculate negative values
+    for the mailbox size or file count. Odd effects could occur as a result.
+    The maildirsize information is now recalculated if the size or filecount
+    end up negative.
+
+27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
+    support for a long time. Removed HAVE_SYS_VFS_H.
+
+28. Installed the latest version of exipick from John Jetmore.
+
+29. In an address list, if the pattern was not a regular expression, an empty
+    subject address (from a bounce message) matched only if the pattern was an
+    empty string. Non-empty patterns were not even tested. This was the wrong
+    because it is perfectly reasonable to use an empty address as part of a
+    database query. An empty address is now tested by patterns that are
+    lookups. However, all the other forms of pattern expect the subject to
+    contain a local part and a domain, and therefore, for them, an empty
+    address still always fails if the pattern is not itself empty.
+
+30. Exim went into a mad DNS loop when attempting to do a callout where the
+    host was specified on an smtp transport, and looking it up yielded more
+    than one IP address.
+
+31. Re-factored the code for checking spool and log partition space into a
+    function that finds that data and another that does the check. The former
+    is then used to implement four new variables: $spool_space, $log_space,
+    $spool_inodes, and $log_inodes.
+
+32. The RFC2047 encoding function was originally intended for short strings
+    such as real names; it was not keeping to the 75-character limit for
+    encoded words that the RFC imposes. It now respects the limit, and
+    generates multiple encoded words if necessary. To be on the safe side, I
+    have increased the buffer size for the ${rfc2047: expansion operator from
+    1024 to 2048 bytes.
+
+33. It is now permitted to omit both strings after an "if" condition; if the
+    condition is true, the result is "true". As before, when the second string
+    is omitted, a false condition yields an empty string. This makes it less
+    cumbersome to write custom ACL and router conditions.
+
+34. Failure to deliver a bounce message always caused it to be frozen, even if
+    there was an errors_to setting on the router. The errors_to setting is now
+    respected.
+
+35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
+    canonical form (fully expanded) before being placed in
+    $sender_host_address.
+
+36. The table in the code that translates DNS record types into text (T_A to
+    "A" for instance) was missing entries for NS and CNAME. It is just possible
+    that this could have caused confusion if both these types were looked up
+    for the same domain, because the text type is used as part of Exim's
+    per-process caching. But the chance of anyone hitting this buglet seems
+    very small.
+
+37. The dnsdb lookup has been extended in a number of ways.
+
+    (1) There is a new type, "zns", which walks up the domain tree until it
+        finds some nameserver records. It should be used with care.
+
+    (2) There is a new type, "mxh", which is like "mx" except that it returns
+        just the host names, not the priorities.
+
+    (3) It is now possible to give a list of domains (or IP addresses) to be
+        looked up. The behaviour when one of the lookups defers can be
+        controlled by a keyword.
+
+    (4) It is now possible to specify the separator character for use when
+        multiple records are returned.
+
+38. The dnslists ACL condition has been extended: it is now possible to supply
+    a list of IP addresses and/or domains to be looked up in a particular DNS
+    domain.
+
+39. Added log_selector=+queue_time_overall.
+
+40. When running the queue in the test harness, wait just a tad after forking a
+    delivery process, to get repeatability of debugging output.
+
+41. Include certificate and key file names in error message when GnuTLS fails
+    to set them up, because the GnuTLS error message doesn't include the name
+    of the failing file when there is a problem reading it.
+
+42. Allow both -bf and -bF in the same test run.
+
+43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
+
+44. The "Exiscan patch" is now merged into the mainline Exim source.
+
+45. Sometimes the final signoff response after QUIT could fail to get
+    transmitted in the non-TLS case. Testing !tls_active instead of tls_active
+    < 0 before doing a fflush(). This bug looks as though it goes back to the
+    introduction of TLS in release 3.20, but "sometimes" must have been rare
+    because the tests only now provoked it.
+
+46. Reset the locale to "C" after calling embedded Perl, in case it was changed
+    (this can affect the format of dates).
+
+47. exim_tidydb, when checking for the continued existence of a message for
+    which it has found a message-specific retry record, was not finding
+    messages that were in split spool directories. Consequently, it was
+    deleting retry records that should have stayed in existence.
+
+48. Steve fixed some bugs in eximstats.
+
+49. The SPA authentication driver was not abandoning authentication and moving
+    on to the next authenticator when an expansion was forced to fail,
+    contradicting the general specification for all authenticators. Instead it
+    was generating a temporary error. It now behaves as specified.
+
+50. The default ordering of permitted cipher suites for GnuTLS was pessimal
+    (the order specifies the preference for clients). The order is now AES256,
+    AES128, 3DES, ARCFOUR128.
+
+51. Small patch to Sieve code - explicitly set From: when generating an
+    autoreply.
+
+52. Exim crashed if a remote delivery caused a very long error message to be
+    recorded - for instance if somebody sent an entire SpamAssassin report back
+    as a large number of 550 error lines. This bug was coincidentally fixed by
+    increasing the size of one of Exim's internal buffers (big_buffer) that
+    happened as part of the Exiscan merge. However, to be on the safe side, I
+    have made the code more robust (and fixed the comments that describe what
+    is going on).
+
+53. Now that there can be additional text after "Completed" in log lines (if
+    the queue_time_overall log selector is set), a one-byte patch to exigrep
+    was needed to allow it to recognize "Completed" as not the last thing in
+    the line.
+
+54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
+    patch that reportedly fixes this has been added. I am not expert enough to
+    create a test for it. This is what the patch creator wrote:
+
+      "I found a little strange behaviour of ldap code when working with
+      Windows 2003 AD Domain, where users was placed in more than one
+      Organization Units. When I tried to give exim partial DN, the exit code
+      of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
+      But simultaneously result of request was absolutely normal ldap result,
+      so I produce this patch..."
+
+    Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
+    REFERENCE, so I have modified the code to exclude the patch when that macro
+    is not defined.
+
+55. Some experimental protocols are using DNS PTR records for new purposes. The
+    keys for these records are domain names, not reversed IP addresses. The
+    dnsdb PTR lookup now tests whether its key is an IP address. If not, it
+    leaves it alone. Component reversal etc. now happens only for IP addresses.
+    CAN-2005-0021
+
+56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
+
+57. Double the size of the debug message buffer (to 2048) so that more of very
+    long debug lines gets shown.
+
+58. The exicyclog utility now does better if the number of log files to keep
+    exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
+
+59. Two changes related to the smtp_active_hostname option:
+
+      (1) $smtp_active_hostname is now available as a variable.
+      (2) The default for smtp_banner uses $smtp_active_hostname instead
+          of $primary_hostname.
+
+60. The host_aton() function is supposed to be passed a string that is known
+    to be a valid IP address. However, in the case of IPv6 addresses, it was
+    not checking this. This is a hostage to fortune. Exim now panics and dies
+    if the condition is not met. A case was found where this could be provoked
+    from a dnsdb PTR lookup with an IPv6 address that had more than 8
+    components; fortuitously, this particular loophole had already been fixed
+    by change 4.50/55 above.
+
+    If there are any other similar loopholes, the new check in host_aton()
+    itself should stop them being exploited. The report I received stated that
+    data on the command line could provoke the exploit when Exim was running as
+    exim, but did not say which command line option was involved. All I could
+    find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
+    running as the user.
+    CAN-2005-0021
+
+61. There was a buffer overflow vulnerability in the SPA authentication code
+    (which came originally from the Samba project). I have added a test to the
+    spa_base64_to_bits() function which I hope fixes it.
+    CAN-2005-0022
+
+62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
+    os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
+
+63. The daemon start-up calls getloadavg() while still root for those OS that
+    need the first call to be done as root, but it missed one case: when
+    deliver_queue_load_max is set with deliver_drop_privilege. This is
+    necessary for the benefit of the queue runner, because there is no re-exec
+    when deliver_drop_privilege is set.
+
+64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
+    This has been fixed.
+
+65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
+    was in use, was not putting the data itself into the right store pool;
+    consequently, it could be overwritten for a subsequent message in the same
+    SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
+    the caching.)
+
+66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
+
+67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
+    address", "IPv4 address", and "IPv6 address", respectively. Some calls of
+    the function were treating the return as a boolean value, which happened to
+    work because 0=false and not-0=true, but is not correct code.
+
+68. The host_aton() function was not handling scoped IPv6 addresses (those
+    with, for example, "%eth0" on the end) correctly.
+
+69. Fixed some compiler warnings in acl.c for the bitmaps specified with
+    negated items (that is, ~something) in unsigned ints. Some compilers
+    apparently mutter when there is no cast.
+
+70. If an address verification called from an ACL failed, and did not produce a
+    user-specific message (i.e. there was only a "system" message), nothing was
+    put in $acl_verify_message. In this situation, it now puts the system
+    message there.
+
+71. Change 4.23/11 added synchronization checking at the start of an SMTP
+    session; change 4.31/43 added the unwanted input to the log line - except
+    that it did not do this in the start of session case. It now does.
+
+72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
+    This is wrong and can cause the other end to generate a synchronization
+    error if it is another Exim or anything else that does the synchronization
+    check. A QUIT command is no longer sent after a timeout.
+
+73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
+    during host lookups.
+
+74. The defer_ok option of callout verification was not working if it was used
+    when verifying addresses in header lines, that is, for this case:
+
+      verify = header_sender/callout=defer_ok
+
+75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
+    those file descriptors could be used for SMTP connections. If anything
+    wrote to stderr (the example that came up was "warn" in embedded Perl), it
+    could be sent to the SMTP client, causing chaos. The daemon now opens
+    stdin, stdout, and stderr to /dev/null when it puts itself into the
+    background.
+
+76. Arrange for output from Perl's "warn" command to be written to Exim's main
+    log by default. The user can override this with suitable Perl magic.
+
+77. The use of log_message on a "discard" ACL verb, which is supposed to add to
+    the log message when discard triggers, was not working for the DATA ACL or
+    for the non-SMTP ACL.
+
+78. Error message wording change in sieve.c.
+
+79. If smtp_accept_max_per_host was set, the number of connections could be
+    restricted to fewer than expected, because the daemon was trying to set up
+    a new connection before checking whether the processes handling previous
+    connections had finished. The check for completed processes is now done
+    earlier. On busy systems, this bug wouldn't be noticed because something
+    else would have woken the daemon, and it would have reaped the completed
+    process earlier.
+
+80. If a message was submitted locally by a user whose login name contained one
+    or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
+    It caused a spool format error. I have fixed the spool reading code. A
+    related problem was that the "from" clause in the Received: line became
+    illegal because of the space(s). It is now covered by ${quote_local_part.
+
+81. Included the latest eximstats from Steve (adds average sizes to HTML Top
+    tables).
+
+82. Updated OS/Makefile-AIX as per message from Mike Meredith.
+
+83. Patch from Sieve maintainer to fix unterminated string problem in
+    "vacation" handling.
+
+84. Some minor changes to the Linux configuration files to help with other
+    OS variants using glibc.
+
+85. One more patch for Sieve to update vacation handling to latest spec.
+
+
+----------------------------------------------------
+See the note above about the 4.44 and 4.50 releases.
+----------------------------------------------------
+
+
+Exim version 4.44
+-----------------
+
+ 1. Change 4.43/35 introduced a bug that caused file counts to be
+    incorrectly computed when quota_filecount was set in an appendfile
+    transport
+
+ 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
+    bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
+    place.
+
+ 3. Give more explanation in the error message when the command for a transport
+    filter fails to execute.
+
+ 4. There are several places where Exim runs a non-Exim command in a
+    subprocess. The SIGUSR1 signal should be disabled for these processes. This
+    was being done only for the command run by the queryprogram router. It is
+    now done for all such subprocesses. The other cases are: ${run, transport
+    filters, and the commands run by the lmtp and pipe transports.
+
+ 5. Some older OS have a limit of 256 on the maximum number of file
+    descriptors. Exim was using setrlimit() to set 1000 as a large value
+    unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
+    systems. I've change it so that if it can't get 1000, it tries for 256.
+
+ 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
+    was an oversight, and furthermore, ever since the addition of extra
+    controls (e.g. 4.43/32), the checks on when to allow different forms of
+    "control" were broken. There should now be diagnostics for all cases when a
+    control that does not make sense is encountered.
+
+ 7. $recipients is now available in the predata ACL (oversight).
+
+ 8. Tidy the search cache before the fork to do a delivery from a message
+    received from the command line. Otherwise the child will trigger a lookup
+    failure and thereby defer the delivery if it tries to use (for example) a
+    cached ldap connection that the parent has called unbind on.
+
+ 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
+    of $address_data from the recipient verification was clobbered by the
+    sender verification.
+
+10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
+    was its contents. (It was OK if the option was not defined at all.)
+
+11. A "Completed" log line is now written for messages that are removed from
+    the spool by the -Mrm option.
+
+12. $host_address is now set to the target address during the checking of
+    ignore_target_hosts.
+
+13. When checking ignore_target_hosts for an ipliteral router, no host name was
+    being passed; this would have caused $sender_host_name to have been used if
+    matching the list had actually called for a host name (not very likely,
+    since this list is usually IP addresses). A host name is now passed as
+    "[x.x.x.x]".
+
+14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
+    code that specifies a non-restarting handler (typically sigaction() in
+    modern systems) in an attempt to fix a rare and obscure crash bug.
+
+15. Narrowed the window for a race in the daemon that could cause it to ignore
+    SIGCHLD signals. This is not a major problem, because they are used only to
+    wake it up if nothing else does.
+
+16. A malformed maildirsize file could cause Exim to calculate negative values
+    for the mailbox size or file count. Odd effects could occur as a result.
+    The maildirsize information is now recalculated if the size or filecount
+    end up negative.
+
+17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
+    support for a long time. Removed HAVE_SYS_VFS_H.
+
+18. Updated exipick to current release from John Jetmore.
+
+19. Allow an empty sender to be matched against a lookup in an address list.
+    Previously the only cases considered were a regular expression, or an
+    empty pattern.
+
+20. Exim went into a mad DNS lookup loop when doing a callout where the
+    host was specified on the transport, if the DNS lookup yielded more than
+    one IP address.
+
+21. The RFC2047 encoding function was originally intended for short strings
+    such as real names; it was not keeping to the 75-character limit for
+    encoded words that the RFC imposes. It now respects the limit, and
+    generates multiple encoded words if necessary. To be on the safe side, I
+    have increased the buffer size for the ${rfc2047: expansion operator from
+    1024 to 2048 bytes.
+
+22. Failure to deliver a bounce message always caused it to be frozen, even if
+    there was an errors_to setting on the router. The errors_to setting is now
+    respected.
+
+23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
+    canonical form (fully expanded) before being placed in
+    $sender_host_address.
+
+24. Updated eximstats to version 1.33
+
+25. Include certificate and key file names in error message when GnuTLS fails
+    to set them up, because the GnuTLS error message doesn't include the name
+    of the failing file when there is a problem reading it.
+
+26. Expand error message when OpenSSL has problems setting up cert/key files.
+    As per change 25.
+
+27. Reset the locale to "C" after calling embedded Perl, in case it was changed
+    (this can affect the format of dates).
+
+28. exim_tidydb, when checking for the continued existence of a message for
+    which it has found a message-specific retry record, was not finding
+    messages that were in split spool directories. Consequently, it was
+    deleting retry records that should have stayed in existence.
+
+29. eximstats updated to version 1.35
+    1.34 - allow eximstats to parse syslog lines as well as mainlog lines
+    1.35 - bugfix such that pie charts by volume are generated correctly
+
+30. The SPA authentication driver was not abandoning authentication and moving
+    on to the next authenticator when an expansion was forced to fail,
+    contradicting the general specification for all authenticators. Instead it
+    was generating a temporary error. It now behaves as specified.
+
+31. The default ordering of permitted cipher suites for GnuTLS was pessimal
+    (the order specifies the preference for clients). The order is now AES256,
+    AES128, 3DES, ARCFOUR128.
+
+31. Small patch to Sieve code - explicitly set From: when generating an
+    autoreply.
+
+32. Exim crashed if a remote delivery caused a very long error message to be
+    recorded - for instance if somebody sent an entire SpamAssassin report back
+    as a large number of 550 error lines. This bug was coincidentally fixed by
+    increasing the size of one of Exim's internal buffers (big_buffer) that
+    happened as part of the Exiscan merge. However, to be on the safe side, I
+    have made the code more robust (and fixed the comments that describe what
+    is going on).
+
+33. Some experimental protocols are using DNS PTR records for new purposes. The
+    keys for these records are domain names, not reversed IP addresses. The
+    dnsdb PTR lookup now tests whether its key is an IP address. If not, it
+    leaves it alone. Component reversal etc. now happens only for IP addresses.
+    CAN-2005-0021
+
+34. The host_aton() function is supposed to be passed a string that is known
+    to be a valid IP address. However, in the case of IPv6 addresses, it was
+    not checking this. This is a hostage to fortune. Exim now panics and dies
+    if the condition is not met. A case was found where this could be provoked
+    from a dnsdb PTR lookup with an IPv6 address that had more than 8
+    components; fortuitously, this particular loophole had already been fixed
+    by change 4.50/55 or 4.44/33 above.
+
+    If there are any other similar loopholes, the new check in host_aton()
+    itself should stop them being exploited. The report I received stated that
+    data on the command line could provoke the exploit when Exim was running as
+    exim, but did not say which command line option was involved. All I could
+    find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
+    running as the user.
+    CAN-2005-0021
+
+35. There was a buffer overflow vulnerability in the SPA authentication code
+    (which came originally from the Samba project). I have added a test to the
+    spa_base64_to_bits() function which I hope fixes it.
+    CAN-2005-0022
+
+36. The daemon start-up calls getloadavg() while still root for those OS that
+    need the first call to be done as root, but it missed one case: when
+    deliver_queue_load_max is set with deliver_drop_privilege. This is
+    necessary for the benefit of the queue runner, because there is no re-exec
+    when deliver_drop_privilege is set.
+
+37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
+    was in use, was not putting the data itself into the right store pool;
+    consequently, it could be overwritten for a subsequent message in the same
+    SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
+    the caching.)
+
+38. Sometimes the final signoff response after QUIT could fail to get
+    transmitted in the non-TLS case. Testing !tls_active instead of tls_active
+    < 0 before doing a fflush(). This bug looks as though it goes back to the
+    introduction of TLS in release 3.20, but "sometimes" must have been rare
+    because the tests only now provoked it.
+
+
+Exim version 4.43
+-----------------
+
+ 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
+    PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
+    Now it returns an integer. A number of calls were still expecting a T/F
+    return. Fortuitously, in all cases, the tests worked in OK situations,
+    which is the norm. However, things would have gone wrong on any write
+    failures on the smtp file descriptor. This function is used when sending
+    messages over SMTP and also when doing verify callouts.
+
+ 2. When Exim is called to do synchronous delivery of a locally submitted
+    message (the -odf or -odi options), it no longer closes stderr before doing
+    the delivery.
+
+ 3. Implemented the mua_wrapper option.
+
+ 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
+
+ 5. Implemented the functions header_remove(), header_testname(),
+    header_add_at_position(), and receive_remove_recipient(), and exported them
+    to local_scan().
+
+ 6. If an ACL "warn" statement specified the addition of headers, Exim already
+    inserted X-ACL-Warn: at the start if there was no header name. However, it
+    was not making this test for the second and subsequent header lines if
+    there were newlines in the string. This meant that an invalid header could
+    be inserted if Exim was badly configured.
+
+ 7. Allow an ACL "warn" statement to add header lines at the start or after all
+    the Received: headers, as well as at the end.
+
+ 8. Added the rcpt_4xx retry error code.
+
+ 9. Added postmaster_mailfrom=xxx to callout verification option.
+
+10. Added mailfrom=xxxx to the callout verification option, for verify=
+    header_sender only.
+
+11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
+    (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
+
+12. Inserted some casts to stop certain compilers warning when using pointer
+    differences as field lengths or precisions in printf-type calls (mostly
+    affecting debugging statements).
+
+13. Added optional readline() support for -be (dynamically loaded).
+
+14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
+    same clock tick as a message's arrival, so that its received time was the
+    same as the "first fail" time on the retry record, and that message
+    remained on the queue past the ultimate address timeout, every queue runner
+    would try a delivery (because it was past the ultimate address timeout) but
+    after another failure, the ultimate address timeout, which should have then
+    bounced the address, did not kick in. This was a "< instead of <=" error;
+    in most cases the first failure would have been in the next clock tick
+    after the received time, and all would be well.
+
+15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
+    being recognized when the domain list was tested by the match_domain
+    condition in an expansion string.
+
+16. Added the ${str2b64: operator.
+
+17. Exim was always calling setrlimit() to set a large limit for the number of
+    processes, without checking whether the existing limit was already
+    adequate. (It did check for the limit on file descriptors.) Furthermore,
+    errors from getrlimit() and setrlimit() were being ignored. Now they are
+    logged to the main and panic logs, but Exim does carry on, to try to do its
+    job under whatever limits there are.
+
+18. Imported PCRE 5.0.
+
+19. Trivial typo in log message " temporarily refused connection" (the leading
+    space).
+
+20. If the log selector return_path_on_delivery was set and an address was
+    redirected to /dev/null, the delivery process crashed because it assumed
+    that a return path would always be set for a "successful" delivery. In this
+    case, the whole delivery is bypassed as an optimization, and therefore no
+    return path is set.
+
+21. Internal re-arrangement: the function for sending a challenge and reading
+    a response while authentication was assuming a zero-terminated challenge
+    string. It's now changed to take a pointer and a length, to allow for
+    binary data in such strings.
+
+22. Added the cyrus_sasl authenticator (code supplied by MBM).
+
+23. Exim was not respecting finduser_retries when seeking the login of the
+    uid under which it was called; it was always trying 10 times. (The default
+    setting of finduser_retries is zero.) Also, it was sleeping after the final
+    failure, which is pointless.
+
+24. Implemented tls_on_connect_ports.
+
+25. Implemented acl_smtp_predata.
+
+26. If the domain in control=submission is set empty, Exim assumes that the
+    authenticated id is a complete email address when it generates From: or
+    Sender: header lines.
+
+27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
+    definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
+    chown and chgrp in /bin and hostname in /usr/bin.
+
+28. Exim was keeping the "process log" file open after each use, just as it
+    does for the main log. This opens the possibility of it remaining open for
+    long periods when the USR1 signal hits a daemon. Occasional processlog
+    errors were reported, that could have been caused by this. Anyway, it seems
+    much more sensible not to leave this file open at all, so that is what now
+    happens.
+
+29. The long-running daemon process does not normally write to the log once it
+    has entered its main loop, and it closes the log before doing so. This is
+    so that log files can straightforwardly be renamed and moved. However,
+    there are a couple of unusual error situations where the daemon does write
+    log entries, and I had neglected to close the log afterwards.
+
+30. The text of an SMTP error response that was received during a remote
+    delivery was being truncated at 512 bytes. This is too short for some of
+    the long messages that one sometimes sees. I've increased the limit to
+    1024.
+
+31. It is now possible to make retry rules that apply only when a message has a
+    specific sender, in particular, an empty sender.
+
+32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
+    it possible to be selective about when SMTP synchronization is enforced.
+
+33. Added "control = caseful_local_part" and "control = "caselower_local_part".
+
+32. Implemented hosts_connection_nolog.
+
+33. Added an ACL for QUIT.
+
+34. Setting "delay_warning=" to disable warnings was not working; it gave a
+    syntax error.
+
+35. Added mailbox_size and mailbox_filecount to appendfile.
+
+36. Added control = no_multiline_responses to ACLs.
+
+37. There was a bug in the logic of the code that waits for the clock to tick
+    in the case where the clock went backwards by a substantial amount such
+    that the microsecond fraction of "now" was more than the microsecond
+    fraction of "then" (but the whole seconds number was less).
+
+38. Added support for the libradius Radius client library this is found on
+    FreeBSD (previously only the radiusclient library was supported).
+
+
+Exim version 4.42
+-----------------
+
+ 1. When certain lookups returned multiple values in the form name=value, the
+    quoting of the values was not always being done properly. Specifically:
+    (a) If the value started with a double quote, but contained no whitespace,
+        it was not quoted.
+    (b) If the value contained whitespace other than a space character (i.e.
+        tabs or newlines or carriage returns) it was not quoted.
+    This fix has been applied to the mysql and pgsql lookups by writing a
+    separate quoting function and calling it from the lookup code. The fix
+    should probably also be applied to nisplus, ibase and oracle lookups, but
+    since I cannot test any of those, I have not disturbed their existing code.
+
+ 2. A hit in the callout cache for a specific address caused a log line with no
+    reason for rejecting RCPT. Now it says "Previous (cached) callout
+    verification failure".
+
+ 3. There was an off-by-one bug in the queryprogram router. An over-long
+    return line was truncated at 256 instead of 255 characters, thereby
+    overflowing its buffer with the terminating zero. As well as fixing this, I
+    have increased the buffer size to 1024 (and made a note to document this).
+
+ 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
+    when Exim is waiting for an SMTP response from a remote server, Exim
+    restarts its select() call on the socket, thereby resetting its timeout.
+    This is not a problem when such interrupts are rare. Somebody set up a cron
+    job to run exiwhat every 2 minutes, which is less than the normal select()
+    timeout (5 or 10 minutes). This meant that the select() timeout never
+    kicked in because it was always reset. I have fixed this by comparing the
+    time when an interrupt arrives with the time at the start of the first call
+    to select(). If more time than the timeout has elapsed, the interrupt is
+    treated as a timeout.
+
+ 5. Some internal re-factoring in preparation for the addition of Sieve
+    extensions (by MH). In particular, the "personal" test is moved to a
+    separate function, and given an option for scanning Cc: and Bcc: (which is
+    not set for Exim filters).
+
+ 6. When Exim created an email address using the login of the caller as the
+    local part (e.g. when creating a From: or Sender: header line), it was not
+    quoting the local part when it contained special characters such as @.
+
+ 7. Installed new OpenBSD configuration files.
+
+ 8. Reworded some messages for syntax errors in "and" and "or" conditions to
+    try to make them clearer.
+
+ 9. Callout options, other than the timeout value, were being ignored when
+    verifying sender addresses in header lines. For example, when using
+
+      verify = header_sender/callout=no_cache
+
+    the cache was (incorrectly) being used.
+
+10. Added a missing instance of ${EXE} to the exim_install script; this affects
+    only the Cygwin environment.
+
+11. When return_path_on_delivery was set as a log selector, if different remote
+    addresses in the same message used different return paths and parallel
+    remote delivery occurred, the wrong values would sometimes be logged.
+    (Whenever a remote delivery process finished, the return path value from
+    the most recently started remote delivery process was logged.)
+
+12. RFC 3848 specifies standard names for the "with" phrase in Received: header
+    lines when AUTH and/or TLS are in use. This is the "received protocol"
+    field. Exim used to use "asmtp" for authenticated SMTP, without any
+    indication (in the protocol name) for TLS use. Now it follows the RFC and
+    uses "esmtpa" if the connection is authenticated, "esmtps" if it is
+    encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
+    names appear in log lines as well as in Received: header lines.
+
+13. Installed MH's patches for Sieve to add the "copy" and "vacation"
+    extensions, and comparison tests, and to fix some bugs.
+
+14. Changes to the "personal" filter test:
+
+    (1) The test was buggy in that it was just doing the equivalent of
+    "contains" tests on header lines. For example, if a user's address was
+    anne@some.where, the "personal" test would incorrectly be true for
+
+      To: susanne@some.where
+
+    This test is now done by extracting each address from the header in turn,
+    and checking the entire address. Other tests that are part of "personal"
+    are now done using regular expressions (for example, to check local parts
+    of addresses in From: header lines).
+
+    (2) The list of non-personal local parts in From: addresses has been
+    extended to include "listserv", "majordomo", "*-request", and "owner-*",
+    taken from the Sieve specification recommendations.
+
+    (3) If the message contains any header line starting with "List-" it is
+    treated as non-personal.
+
+    (4) The test for "circular" in the Subject: header line has been removed
+    because it now seems ill-conceived.
+
+15. Minor typos in src/EDITME comments corrected.
+
+16. Installed latest exipick from John Jetmore.
+
+17. If headers_add on a router specified a text string that was too long for
+    string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
+    of string_sprintf() is now avoided.
+
+18. $message_body_size was not set (it was always zero) when running the DATA
+    ACL and the local_scan() function.
+
+19. For the "mail" command in an Exim filter, no default was being set for
+    the once_repeat time, causing a random time value to be used if "once" was
+    specified. (If the value happened to be <= 0, no repeat happened.) The
+    default is now 0s, meaning "never repeat". The "vacation" command was OK
+    (its default is 7d). It's somewhat surprising nobody ever noticed this bug
+    (I found it when inspecting the code).
+
+20. There is now an overall timeout for performing a callout verification. It
+    defaults to 4 times the callout timeout, which applies to individual SMTP
+    commands during the callout. The overall timeout applies when there is more
+    than one host that can be tried. The timeout is checked before trying the
+    next host. This prevents very long delays if there are a large number of
+    hosts and all are timing out (e.g. when the network connections are timing
+    out). The value of the overall timeout can be changed by specifying an
+    additional sub-option for "callout", called "maxwait". For example:
+
+      verify = sender/callout=5s,maxwait=20s
+
+21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
+    to the end before writing, but this should make it even safer).
+
+22. Exim was forgetting that it had advertised PIPELINING for the second and
+    subsequent messages on an SMTP connection. It was also not resetting its
+    memory on STARTTLS and an internal HELO.
+
+23. When Exim logs an SMTP synchronization error within a session, it now
+    records whether PIPELINING has been advertised or not.
+
+24. Added 3 instances of "(long int)" casts to time_t variables that were being
+    formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
+    rather than long int.
+
+25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
+
+26. Added the never_mail option to autoreply.
+
+
+Exim version 4.41
+-----------------
+
+ 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
+    crash if the getsockname() call failed; this can happen if a connection is
+    closed very soon after it is established. The problem was simply in the
+    order in which certain operations were done, causing Exim to try to write
+    to the SMTP stream before it had set up the file descriptor. The bug has
+    been fixed by making things happen in the correct order.
+
+
+Exim version 4.40
+-----------------
+
+ 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
+    before the connection was closed, thus losing the rejection response.
+
+ 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
+    some early Solaris releases, but causes trouble in current releases where
+    socklen_t is defined.
+
+ 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
+    always exist.
+
+ 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
+    configured.
+
+ 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
+    that releasing the top of it at the end releases what was used for sub-
+    expansions (unless the block got too big). However, discard this block if
+    the first thing is a variable or header, so that we can use its block when
+    it is dynamic (useful for very large $message_headers, for example).
+
+ 6. Lookups now cache *every* query, not just the most recent. A new, separate
+    store pool is used for this. It can be recovered when all lookup caches are
+    flushed. Lookups now release memory at the end of their result strings.
+    This has involved some general refactoring of the lookup sources.
+
+ 7. Some code has been added to the store_xxx() functions to reduce the amount
+    of flapping under certain conditions.
+
+ 8. log_incoming_interface used to affect only the <= reception log lines. Now
+    it causes the local interface and port to be added to several more SMTP log
+    lines, for example "SMTP connection from", and rejection lines.
+
+ 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
+
+10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
+
+11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
+    could be overwritten at the end of the current message (or the start of a
+    new message if it was set in a HELO ACL). The value is now preserved for
+    the duration of the SMTP connection.
+
+12. If a transport had a headers_rewrite setting, and a matching header line
+    contained an unqualified address, that address was qualified, even if it
+    did not match any rewriting rules. The underlying bug was that the values
+    of the flags that permit the existence of unqualified sender and recipient
+    addresses in header lines (set by {sender,recipient}_unqualified_hosts for
+    non-local messages, and by -bnq for local messages) were not being
+    preserved with the message after it was received.
+
+13. When Exim was logging an SMTP synchronization error, it could sometimes log
+    "next input=" as part of the text comprising the host identity instead of
+    the correct text. The code was using the same buffer for two different
+    strings. However, depending on which order the printing function evaluated
+    its arguments, the bug did not always show up. Under Linux, for example, my
+    test suite worked just fine.
+
+14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
+    doesn't work with some older versions of Perl. It has been changed to "my",
+    which in any case is probably the better facility to use.
+
+15. A really picky compiler found some instances of statements for creating
+    error messages that either had too many or two few arguments for the format
+    string.
+
+16. The size of the buffer for calls to the DNS resolver has been increased
+    from 1024 to 2048. A larger buffer is needed when performing PTR lookups
+    for addresses that have a lot of PTR records. This alleviates a problem; it
+    does not fully solve it.
+
+17. A dnsdb lookup for PTR records that receives more data than will fit in the
+    buffer now truncates the list and logs the incident, which is the same
+    action as happens when Exim is looking up a host name and its aliases.
+    Previously in this situation something unpredictable would happen;
+    sometimes it was "internal error: store_reset failed".
+
+18. If a server dropped the connection unexpectedly when an Exim client was
+    using GnuTLS and trying to read a response, the client delivery process
+    crashed while trying to generate an error log message.
+
+19. If a "warn" verb in an ACL added multiple headers to a message in a single
+    string, for example:
+
+      warn message = H1: something\nH2: something
+
+    the text was added as a single header line from Exim's point of view
+    though it ended up OK in the delivered message. However, searching for the
+    second and subsequent header lines using $h_h2: did not work. This has been
+    fixed. Similarly, if a system filter added multiple headers in this way,
+    the routers could not see them.
+
+20. Expanded the error message when iplsearch is called with an invalid key to
+    suggest using net-iplsearch in a host list.
+
+21. When running tests using -bh, any delays imposed by "delay" modifiers in
+    ACLs are no longer actually imposed (and a message to that effect is
+    output).
+
+22. If a "gecos" field in a passwd entry contained escaped characters, in
+    particular, if it contained a \" sequence, Exim got it wrong when building
+    a From: or a Sender: header from that name. A second bug also caused
+    incorrect handling when an unquoted " was present following a character
+    that needed quoting.
+
+23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
+    was not being matched caselessly.
+
+24. Arranged for all hyphens in the exim.8 source to be escaped with
+    backslashes.
+
+25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
+    properly. Recipient callout cache records were still being keyed to include
+    the sender, even when use_sender was set false. This led to far more
+    callouts that were necessary. The sender is no longer included in the key
+    when use_sender is false.
+
+26. Added "control = submission" modifier to ACLs.
+
+27. Added the ${base62d: operator to decode base 62 numbers.
+
+28. dnsdb lookups can now access SRV records.
+
+29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
+    the configuration file.
+
+30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
+    (-v) mode. This makes the output for a verbose queue run more intelligible.
+
+31. Added a use_postmaster feature to recipient callouts.
+
+32. Added the $body_zerocount variable, containing the number of binary zero
+    bytes in the message body.
+
+33. The time of last modification of the "new" subdirectory is now used as the
+    "mailbox time last read" when there is a quota error for a maildir
+    delivery.
+
+34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
+
+35. Added +ignore_unknown as a special item in host lists.
+
+36. Code for decoding IPv6 addresses in host lists is now included, even if
+    IPv6 support is not being compiled. This fixes a bug in which an IPv6
+    address was recognized as an IP address, but was then not correctly decoded
+    into binary, causing unexpected and incorrect effects when compared with
+    another IP address.
+
+
+Exim version 4.34
+-----------------
+
+ 1. Very minor rewording of debugging text in manualroute to say "list of
+    hosts" instead of "hostlist".
+
+ 2. If verify=header_syntax was set, and a header line with an unqualified
+    address (no domain) and a large number of spaces between the end of the
+    name and the colon was received, the reception process suffered a buffer
+    overflow, and (when I tested it) crashed. This was caused by some obsolete
+    code that should have been removed. The fix is to remove it!
+
+ 3. When running in the test harness, delay a bit after writing a bounce
+    message to get a bit more predictability in the log output.
+
+ 4. Added a call to search_tidyup() just before forking a reception process. In
+    theory, someone could use a lookup in the expansion of smtp_accept_max_
+    per_host which, without the tidyup, could leave open a database connection.
+
+ 5. Added the variables $recipient_data and $sender_data which get set from a
+    lookup success in an ACL "recipients" or "senders" condition, or a router
+    "senders" option, similar to $domain_data and $local_part_data.
+
+ 6. Moved the writing of debug_print from before to after the "senders" test
+    for routers.
+
+ 7. Change 4.31/66 (moving the time when the Received: is generated) caused
+    problems for message scanning, either using a data ACL, or using
+    local_scan() because the Received: header was not generated till after they
+    were called (in order to set the time as the time of reception completion).
+    I have revised the way this works. The header is now generated after the
+    body is received, but before the ACL or local_scan() are called. After they
+    are run, the timestamp in the header is updated.
+
+
+Exim version 4.33
+-----------------
+
+ 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
+    before starting a queue runner without re-exec. This happened only when
+    deliver_drop_privilege was set or when the Exim user was set to root. The
+    effect of the bug was that timeouts during subsequent deliveries caused
+    crashes instead of being properly handled. The handler is now left at its
+    default (and expected) setting.
+
+ 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
+    message, again when deliver_drop_privilege is set or Exim is run as root.
+    The bug described in (1) was not present in this case, but the tidying up
+    of the other signals was missing. I have made the two cases consistent.
+
+ 3. The ignore_target_hosts setting on a manualroute router was being ignored
+    for hosts that were looked up using the /MX notation.
+
+ 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
+    in domain lists.
+
+ 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
+    operated on the sender address. After changing the $sender_address to <>
+    for the sender address verify, Exim was re-instated it as the original
+    (before rewriting) address, but remembering that it had rewritten it, so it
+    wasn't rewriting it again. This bug also had the effect of breaking the
+    sender address verification caching when the sender address was rewritten.
+
+ 6. The ignore_target_hosts option was being ignored by the ipliteral router.
+    This has been changed so that if the ip literal address matches
+    ignore_target_hosts, the router declines.
+
+ 7. Added expansion conditions match_domain, match_address, and match_local_
+    part (NOT match_host).
+
+ 8. The placeholder for the Received: header didn't have a length field set.
+
+ 9. Added code to Exim itself and to exim_lock to test for a specific race
+    condition that could lead to file corruption when using MBX delivery. The
+    issue is with the lockfile that is created in /tmp. If this file is removed
+    after a process has opened it but before that process has acquired a lock,
+    there is the potential for a second process to recreate the file and also
+    acquire a lock. This could lead to two Exim processes writing to the file
+    at the same time. The added code performs the same test as UW imapd; it
+    checks after acquiring the lock that its file descriptor still refers to
+    the same named file.
+
+10. The buffer for building added header lines was of fixed size, 8192 bytes.
+    It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
+    when Exim is built.
+
+11. Added the smtp_active_hostname option. If used, this will typically be made
+    to depend on the incoming interface address. Because $interface_address is
+    not set up until the daemon has forked a reception process, error responses
+    that can happen earlier (such as "too many connections") no longer contain
+    a host name.
+
+12. If an expansion in a condition on a "warn" statement fails because a lookup
+    defers, the "warn" statement is abandoned, and the next ACL statement is
+    processed. Previously this caused the whole ACL to be aborted.
+
+13. Added the iplsearch lookup type.
+
+14. Added ident_timeout as a log selector.
+
+15. Added tls_certificate_verified as a log selector.
+
+16. Added a global option tls_require_ciphers (compare the smtp transport
+    option of the same name). This controls incoming TLS connections.
+
+17. I finally figured out how to make tls_require_ciphers do a similar thing
+    in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
+    before starting the TLS session.
+
+18. Tabs are now shown as \t in -bP output.
+
+19. If the log selector return_path_on_delivery was set, Exim crashed when
+    bouncing a message because it had too many Received: header lines.
+
+20. If two routers both had headers_remove settings, and the first one included
+    a superfluous trailing colon, the final name in the first list and the
+    first name in the second list were incorrectly joined into one item (with a
+    colon in the middle).
+
+
+Exim version 4.32
+-----------------
+
+ 1. Added -C and -D options to the exinext utility, mainly to make it easier
+    to include in the automated testing, but these could be helpful when
+    multiple configurations are in use.
+
+ 2. The exinext utility was not formatting the output nicely when there was
+    an alternate port involved in the retry record key, nor when there was a
+    message id as well (for retries that were specific to a specific message
+    and a specific host). It was also confused by IPv6 addresses, because of
+    the additional colons they contain. I have fixed the IPv4 problem, and
+    patched it up to do a reasonable job for IPv6.
+
+ 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
+    delivery, the log line now contains "pipelined" if PIPELINING was used.
+
+ 4. An SMTP transport process used to panic and die if the bind() call to set
+    an explicit outgoing interface failed. This has been changed; it is now
+    treated in the same way as a connect() failure.
+
+ 5. A reference to $sender_host_name in the part of a conditional expansion
+    that was being skipped was still causing a DNS lookup. This no longer
+    occurs.
+
+ 6. The def: expansion condition was not recognizing references to header lines
+    that used bh_ and bheader_.
+
+ 7. Added the _cache feature to named lists.
+
+ 8. The code for checking quota_filecount in the appendfile transport was
+    allowing one more file than it should have been.
+
+ 9. For compatibility with Sendmail, the command line option
+
+      -prval:sval
+
+    is equivalent to
+
+      -oMr rval -oMs sval
+
+    and sets the incoming protocol and host name (for trusted callers). The
+    host name and its colon can be omitted when only the protocol is to be set.
+    Note the Exim already has two private options, -pd and -ps, that refer to
+    embedded Perl. It is therefore impossible to set a protocol value of "d" or
+    "s", but I don't think that's a major issue.
+
+10. A number of refactoring changes to the code, none of which should affect
+    Exim's behaviour:
+
+    (a) The number of logging options was getting close to filling up the
+    32-bit word that was used as a bit map. I have split them into two classes:
+    those that are passed in the argument to log_write(), and those that are
+    only ever tested independently outside of that function. These are now in
+    separate 32-bit words, so there is plenty of room for expansion again.
+    There is no change in the user interface or the logging behaviour.
+
+    (b) When building, for example, log lines, the code previously used a
+    macro that called string_cat() twice, in order to add two strings. This is
+    not really sufficiently general. Furthermore, there was one instance where
+    it was actually wrong because one of the argument was used twice, and in
+    one call a function was used. (As it happened, calling the function twice
+    did not affect the overall behaviour.) The macro has been replaced by a
+    function that can join an arbitrary number of extra strings onto a growing
+    string.
+
+    (c) The code for expansion conditions now uses a table and a binary chop
+    instead of a serial search (which was left over from when there were very
+    few conditions). Also, it now recognizes conditions like "pam" even when
+    the relevant support is not compiled in: a suitably worded error message is
+    given if an attempt is made to use such a condition.
+
+11. Added ${time_interval:xxxxx}.
+
+12. A bug was causing one of the ddress fields not to be passed back correctly
+    from remote delivery subprocesses. The field in question was not being
+    subsequently used, so this caused to problems in practice.
+
+13. Added new log selectors queue_time and deliver_time.
+
+14. Might have fixed a bug in maildirsizefile handling that threw up
+    "unexpected character" debug warnings, and recalculated the data
+    unnecessarily. In any case, I expanded the warning message to give more
+    information.
+
+15. Added the message "Restricted characters in address" to the statements in
+    the default ACL that block characters like @ and % in local parts.
+
+16. Change 71 for release 4.31 proved to be much less benign that I imagined.
+    Three changes have been made:
+
+    (a) There was a serious bug; a negative response to MAIL caused the whole
+        recipient domain to be cached as invalid, thereby blocking all messages
+        to all local parts at the same domain, from all senders. This bug has
+        been fixed. The domain is no longer cached after a negative response to
+        MAIL if the sender used is not empty.
+
+    (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
+        been restored.
+
+    (c) A new callout option, "use_sender" has been added for people who want
+        the modified behaviour.
+
+
+Exim version 4.31
+-----------------
+
+ 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
+    Larry Rosenman.
+
+ 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
+    indeed breaks things for older releases.
+
+ 3. Added additional logging to the case where there is a problem reading data
+    from a filter that is running in a subprocess using a pipe, in order to
+    try to track down a specific problem.
+
+ 4. Testing facility fudge: when running in the test harness and attempting
+    to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
+    getting "No route to host". Convert this to a timeout.
+
+ 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
+    warning.
+
+ 6. Some OS don't have socklen_t but use size_t instead. This affects the
+    fifth argument of getsockopt() amongst other things. This is now
+    configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
+    can be set for individual OS. I have set it for SunOS5, OSF1, and
+    Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
+    some earlier ones do not.
+
+ 7. Change 4.30/15 was not doing the test caselessly.
+
+ 8. The standard form for an IPv6 address literal was being rejected by address
+    parsing in, for example, MAIL and RCPT commands. An example of this kind of
+    address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
+    this, as well as the form without the "IPv6" on the front (but only when
+    address literals are enabled, of course).
+
+ 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
+
+10. Exim crashed if a message with an empty sender address specified by -f
+    encountered a router with an errors_to setting. This could be provoked only
+    by a command such as
+
+      exim -f "" ...
+
+    where an empty string was supplied; "<>" did not hit this bug.
+
+11. Installed PCRE release 4.5.
+
+12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
+    remained set. It is now erased.
+
+13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
+    times from message ids (which are base 36 rather than the normal 62).
+
+14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
+    were being counted as actual protocol errors, and logged if the log
+    selector +smtp_protocol_error was set. One cannot be perfect in this test,
+    but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
+    and DATA following a set of rejected RCPTs do not count as protocol errors.
+    In other words, Exim assumes they were pipelined, though this may not
+    actually be the case. Of course, in all cases the client gets an
+    appropriate error code.
+
+15. If a lookup fails in an ACL condition, a message about the failure may
+    be available; it is used if testing the ACL cannot continue, because most
+    such messages specify what the cause of the deferral is. However, some
+    messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
+    that caused an old message to be retained and used if a later statement
+    caused a defer, replacing the real cause of the deferral.
+
+16. If an IP address had so many PTR records that the DNS lookup buffer
+    was not large enough to hold them, Exim could crash while trying to process
+    the truncated data. It now detects and logs this case.
+
+17. Further to 4.21/58, another change has been made: if (and only if) the
+    first line of a message (the first header line) ends with CRLF, a bare LF
+    in a subsequent header line has a space inserted after it, so as not to
+    terminate the header.
+
+18. Refactoring: tidied an ugly bit of code in appendfile that copied data
+    unnecessarily, used atoi() instead of strtol(), and didn't check the
+    termination when getting file sizes from file names by regex.
+
+19. Completely re-implemented the support for maildirsize files, in the light
+    of a number of problems with the previous contributed implementation
+    (4.30/29). In particular:
+
+    . If the quota is zero, the maildirsize file is maintained, but no quota is
+      imposed.
+
+    . If the maildir directory does not exist, it is created before any attempt
+      to write a maildirsize file.
+
+    . The quota value in the file is just a cache; if the quota is changed in
+      the transport, the new value overrides.
+
+    . A regular expression is available for excluding directories from the
+      count.
+
+20. The autoreply transport checks the characters in options that define the
+    message's headers; it allows continued headers, but it was checking with
+    isspace() after an embedded newline instead of explicitly looking for a
+    space or a tab.
+
+21. If all the "regular" hosts to which an address was routed had passed their
+    expiry times, and had not reached their retry times, the address was
+    bounced, even if fallback hosts were defined. Now Exim should go on to try
+    the fallback hosts.
+
+22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
+    equivalent code in the SMTP transport. Some hosts send humungous responses
+    to HELO/EHLO, more than 1024 it seems.
+
+23. Refactoring: code in filter.c used (void *) for "any old type" but this
+    gives compiler warnings in some environments. I've now done it "properly",
+    using a union.
+
+24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
+    (because of problems with the built-in one) was declared to return uschar *
+    instead of char *, causing compiler failure.
+
+25. Fixed a file descriptor leak when processing alias/forward files.
+
+26. Fixed a minor format string issue in dbfn.c.
+
+27. Typo in exim.c: ("dmbnz" for "dbmnz").
+
+28. If a filter file refered to $h_xxx or $message_headers, and the headers
+    contained RFC 2047 "words", Exim's memory could, under certain conditions,
+    become corrupted.
+
+29. When a sender address is verified, it is cached, to save repeating the test
+    when there is more than one recipient in a message. However, when the
+    verification involves a callout, it is possible for different callout
+    options to be set for different recipients. It is too complicated to keep
+    track of this in the cache, so now Exim always runs a verification when a
+    callout is required, relying on the callout cache for the optimization.
+    The overhead is duplication of the address routing, but this should not be
+    too great.
+
+30. Fixed a bug in callout caching. If a RCPT command caused the sender address
+    to be verified with callout=postmaster, and the main callout worked but the
+    postmaster check failed, the verification correctly failed. However, if a
+    subsequent RCPT command asked for sender verification *without* the
+    postmaster check, incorrect caching caused this verification also to fail,
+    incorrectly.
+
+31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
+    it was not caching the DNS options (qualify_single, search_parents) that
+    were used when the lookup failed. A subsequent lookup with different
+    options therefore always gave the same answer, though there were cases
+    where it should not have. (Example: a "domains = !$mx_any" option on a
+    dnslookup router: the "domains" option is always processed without any
+    widening, but the router might have qualify_single set.) Now Exim uses the
+    cached value only when the same options are set.
+
+32. Added John Jetmore's "exipick" utility to the distribution.
+
+33. GnuTLS: When an attempt to start a TLS session fails for any reason other
+    than a timeout (e.g. a certificate is required, and is not provided), an
+    Exim server now closes the connection immediately. Previously it waited for
+    the client to close - but if the client is SSL, it seems that they each
+    wait for each other, leading to a delay before one of them times out.
+
+34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
+    maintained 0.8.x compatibility because I don't think many are using it, and
+    it is clearly obsolete.
+
+35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
+    transport.
+
+36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
+    client certificate was expired. A simple patch fixes this, though I don't
+    understand the full logic of why the verify callback is called multiple
+    times.
+
+37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
+    Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
+    which causes problems with some clients (such as the Certicom SSL Plus
+    library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
+    disables the coutermeasure allowing Eudora to connect."
+
+38. Exim was not checking that a write() to a log file succeeded. This could
+    lead to Bad Things if a log got too big, in particular if it hit a file
+    size limit. Exim now panics and dies if it cannot write to a log file, just
+    as it does if it cannot open a log file.
+
+39. Modified OS/Makefile-Linux so that it now contains
+
+      CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+
+    The two -D definitions ensure that Exim is compiled with large file
+    support, which makes it possible to handle log files that are bigger than
+    2^31.
+
+40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
+    instance) a domain was checked against a named list that involved a lookup,
+    causing $domain_data to be set, then another domain was checked against the
+    same list, then the first domain was re-checked, the value of $domain_data
+    after the final check could be wrong. In particular, if the second check
+    failed, it could be set empty. This bug probably also applied to
+    $localpart_data.
+
+41. The strip_trailing_dot option was not being applied to the address given
+    with the -f command-line option.
+
+42. The code for reading a message's header from the spool was incrementing
+    $received_count, but never initializing it. This meant that the value was
+    incorrect (doubled) while delivering a message in the same process in which
+    it was received. In the most common configuration of Exim, this never
+    happens - a fresh exec is done - but it can happen when
+    deliver_drop_privilege is set.
+
+43. When Exim logs an SMTP synchronization error - client data sent too soon -
+    it now includes up to 150 characters of the unexpected data in the log
+    line.
+
+44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
+    and building data strings. The size of both of these buffers was 10 000
+    bytes - far larger than anybody would *ever* want, thought I. Needless to
+    say, somebody hit the limit. I have increased the maximum line length to
+    20 000 and the maximum data length of concatenated lines to 100 000. I have
+    also fixed two bugs, because there was no checking on these buffers. Tsk,
+    tsk. Now exim_dbmbuild gives a message and exits with an error code if a
+    buffer is too small.
+
+45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
+    lsearch lookups. Now it does.
+
+46. When parsing a route_list item in a manualroute router, a fixed-length
+    buffer was used for the list of hosts. I made this 1024 bytes long,
+    thinking that nobody would ever have a list of hosts that long. Wrong.
+    Somebody had a whole pile of complicated expansion conditions, and the
+    string was silently truncated, leading to an expansion error. It turns out
+    that it is easier to change to an unlimited length (owing to other changes
+    that have happened since this code was originally written) than to build
+    structure for giving a limitation error. The length of the item that
+    expands into the list of hosts is now unlimited.
+
+47. The lsearch lookup could not handle data where the length of text line was
+    more than 4095 characters. Such lines were truncated, leading to shortened
+    data being returned. It should now handle lines of any length.
+
+48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
+    xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
+    ACL").
+
+49. Cosmetic tidy to scripts like exicyclog that are generated by globally
+    replacing strings such as BIN_DIRECTORY in a source file: the replacement
+    no longer happens in comment lines. A list of replacements is now placed
+    at the head of all of the source files, except those whose only change is
+    to replace PERL_COMMAND in the very first #! line.
+
+50. Replaced the slow insertion sort in queue.c, for sorting the list of
+    messages on the queue, with a bottom-up merge sort, using code contributed
+    by Michael Haardt. This should make operations like -bp somewhat faster on
+    large queues. It won't affect queue runners, except when queue_run_in_order
+    is set.
+
+51. Installed eximstats 1.31 in the distribution.
+
+52. Added support for SRV lookups to the dnslookup router.
+
+53. If an ACL referred to $message_body or $message_body_end, the value was not
+    reset for any messages that followed in the same SMTP session.
+
+54. The store-handling optimization for building very long strings was not
+    differentiating between the different store pools. I don't think this
+    actually made any difference in practice, but I've tidied it.
+
+55. While running the routers to verify a sender address, $sender_address
+    was still set to the sender address. This is wrong, because when routing to
+    send a bounce to the sender, it would be empty. Therefore, I have changed
+    it so that, while verifying a sender address, $sender_address is set to <>.
+    (There is no change to what happens when verifying a recipient address.)
+
+56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
+    target A or AAAA records (if not already returned) without resetting the
+    qualify_single or search_parents options of the DNS resolver. These are
+    inappropriate in this case because the targets of MX and SRV records must
+    be FQDNs. A broken DNS record could cause trouble if it happened to have a
+    target that, when qualified, matched something in the local domain. These
+    two options are now turned off when doing these lookups.
+
+57. It seems that at least some releases of Reiserfs (which does not have the
+    concept of a fixed number of inodes) returns zero and not -1 for the
+    number of available inodes. This interacted badly with check_spool_inodes,
+    which assumed that -1 was the "no such thing" setting. What I have done is
+    to check that the total number of inodes is greater than zero before doing
+    the test of how many are available.
+
+58. When a "warn" ACL statement has a log_message modifier, the message is
+    remembered, and not repeated. This is to avoid a lot of repetition when a
+    message has many recipients that cause the same warning to be written.
+    However, Exim was preserving the list of already written lines for an
+    entire SMTP session, which doesn't seem right. The memory is now reset if a
+    new message is started.
+
+59. The "rewrite" debugging flag was not showing the result of rewriting in the
+    debugging output unless log_rewrite was also set.
+
+60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
+    of (int)(handle) when we know that handle contains (void *)(-1).
+
+61. The Exim daemon panic-logs an error return when it closes the incoming
+    connection. However "connection reset by peer" seems to be common, and
+    isn't really an error worthy of noting specially, so that particular error
+    is no long logged.
+
+62. When Exim is trying to find all the local interfaces, it used to panic and
+    die if the ioctl to get the interface flags failed. However, it seems that
+    on at least one OS (Solaris 9) it is possible to have an interface that is
+    included in the list of interfaces, but for which you get a failure error
+    for this call. This happens when the interface is not "plumbed" into a
+    protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
+    failure of the "get flags" call assumes that the interface is down.
+
+63. Added a ${eval10: operator, which assumes all numbers are decimal. This
+    makes life easier for people who are doing arithmetic on fields extracted
+    from dates, where you often get leading zeros that should not be
+    interpreted as octal.
+
+64. Added qualify_domain to the redirect router, to override the global
+    setting.
+
+65. If a pathologically long header line contained very many addresses (the
+    report of this problem mentioned 10 000) and each of them was rewritten,
+    Exim could use up a very large amount of memory. (It kept on making new
+    copies of the header line as it rewrote, and never released the old ones.)
+    At the expense of a bit more processing, the header rewriting function has
+    been changed so that it no longer eats memory in this way.
+
+66. The generation of the Received: header has been moved from the time that a
+    message starts to be received, to the time that it finishes. The timestamp
+    in the Received: header should now be very close to that of the <= log
+    line. There are two side-effects of this change:
+
+    (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
+        logged header lines no longer include the local Received: line, because
+        it has not yet been created. The same applies to a copy of the message
+        that is returned to a non-SMTP sender when a message is rejected.
+
+    (b) When a filter file is tested using -bf, no additional Received: header
+        is added to the test message. After some thought, I decided that this
+        is a bug fix.
+
+    This change does not affect the value of $received_for. It is still set
+    after address rewriting, but before local_scan() is called.
+
+67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
+
+68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
+    gave an unhelpful panic error message, and a defer error. I have managed to
+    change this behaviour so that it now rejects any supplied certificate,
+    which seems right, as the list of acceptable certificates is empty.
+
+69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
+    gave an unhelpful defer error. I have not managed to make this reject any
+    supplied certificates, but the error message it gives is "no certificate
+    supplied", which is not helpful.
+
+70. exigrep's output now also includes lines that are not associated with any
+    message, but which match the given pattern. Implemented by a patch from
+    Martin Sluka, which also tidied up the Perl a bit.
+
+71. Recipient callout verification, like sender verification, was using <> in
+    the MAIL FROM command. This isn't really the right thing, since the actual
+    sender may affect whether the remote host accepts the recipient or not. I
+    have changed it to use the actual sender in the callout; this means that
+    the cache record is now keyed on a recipient/sender pair, not just the
+    recipient address. There doesn't seem to be a real danger of callout loops,
+    since a callout by the remote host to check the sender would use <>.
+    [SEE ABOVE: changed after hitting problems.]
+
+72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
+    temporary errors. However, in the case of such a code being given after
+    the end of a data transmission (i.e. after ".") Exim was failing to write
+    a retry record for the message. (Yes, there was some broken host that was
+    actually sending 8xx at this point.)
+
+73. An unknown lookup type in a host list could cause Exim to panic-die when
+    the list was checked. (An example that provoked this was putting <; in the
+    middle of a list instead of at the start.) If this happened during a DATA
+    ACL check, a -D file could be left lying around. This kind of configuration
+    error no longer causes Exim to die; instead it causes a defer error. The
+    incident is still logged to the main and panic logs.
+
+74. Buglet left over from Exim 3 conversion. The message "too many messages
+    in one connection" was written to the rejectlog but not the mainlog, except
+    when address rewriting (yes!) was being logged.
+
+75. Added write_rejectlog option.
+
+76. When a system filter was run not as root (that is, when system_filter_user
+    was set), the values of the $n variables were not being returned to the
+    main process; thus, they were not subsequently available in the $sn
+    variables.
+
+77. Added +return_path_on_delivery log selector.
+
+78. A connection timeout was being treated differently from recipients deferred
+    when testing hosts_max_try with a message that was older than the host's
+    retry timeout. (The host should not be counted, thus allowing all hosts to
+    be tried at least once before bouncing.) This may have been the cause of an
+    occasionally reported bug whereby a message would remain on the queue
+    longer than the retry timeout, but would be bounced if a delivery was
+    forced. I say "may" because I never totally pinned down the problem;
+    setting up timeout/retry tests is difficult. See also the next item.
+
+79. The ultimate address timeout was not being applied to errors that involved
+    a combination of host plus message (for example, a timeout on a MAIL
+    command). When an address resolved to a number of possible hosts, and they
+    were not all tried for each delivery (e.g. because of hosts_max_try), a
+    message could remain on the queue longer than the retry timeout.
+
+80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
+    Haardt.
+
+81. Fixed an obscure SMTP outgoing bug which required at least the following
+    conditions: (a) there was another message waiting for the same server;
+    (b) the server returned 5xx to all RCPT commands in the first message so
+    that the message was not completed; (c) the server dropped the connection
+    or gave a negative response to the RSET that Exim sends to abort the
+    transaction. The observed case was a dropped connection after DATA that had
+    been sent in pipelining mode. That is, the server had advertised PIPELINING
+    but was not implementing it correctly. The effect of the bug was incorrect
+    behaviour, such as trying another host, and this could lead to a crash.
+
+
+Exim version 4.30
+-----------------
+
+ 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
+    and daemon.c were passed as pointers to ints; they should have been
+    pointers to socklen_t variables (which are typically unsigned ints).
+
+ 2. Some signed/unsigned type warnings in the os.c file for Linux have been
+    fixed.
+
+ 3. Fixed a really odd bug that affected only the testing scheme; patching a
+    certain fixed string in the binary changed the value of another string that
+    happened to be identical to the end of the original first string.
+
+ 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
+    name", it returns that address as the IP address. On some operating
+    systems (e.g. Solaris), it also passes back the IP address string as the
+    "host name". However, on others (e.g. Linux), it passes back an empty
+    string. Exim wasn't checking for this, and was changing the host name to an
+    empty string, assuming it had been canonicalized.
+
+ 5. Although rare, it is permitted to have more than one PTR record for a given
+    IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
+    all the names associated with an address, because they do in Solaris.
+    However, it seems that they do not in Linux for data that comes from the
+    DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
+    I found this out when I moved to a new Linux workstation and tried to run
+    the Exim test suite.
+
+    To get round this problem I have changed the code so that it now does its
+    own call to the DNS to look up PTR records when searching for a host name.
+    If nothing can be found in the DNS, it tries gethostbyaddr(), so that
+    addresses that are only in /etc/hosts are still found.
+
+    This behaviour is, however, controlled by an option called host_lookup_
+    order, which defaults to "bydns:byaddr". If people want to use the other
+    order, or indeed, just use one or the other means of lookup, they can
+    specify it in this variable.
+
+ 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
+    some operating systems, this comes back from gethostbyaddr() as an empty
+    string, and this is what Exim used to test for. However, it seems that in
+    other systems, "." is yielded. Exim now tests for this case too.
+
+ 7. The values of check_spool_space and check_log_space are now held internally
+    as a number of kilobytes instead of an absolute number of bytes. If a
+    numbers is specified without 'K' or 'M', it is rounded up to the nearest
+    kilobyte. This means that much larger values can be stored.
+
+ 8. Exim monitor: an attempt to get the action menu when not actually pointing
+    at a message produces an empty menu entitled "No message selected". This
+    works on Solaris (OpenWindows). However, XFree86 does not like a menu with
+    no entries in it ("Shell widget menu has zero width and/or height"). So I
+    have added a single, blank menu entry in this case.
+
+ 9. Added ${quote_local_part.
+
+10. MIME decoding is now applied to the contents of Subject: header lines when
+    they are logged.
+
+11. Now that a reference to $sender_host_address automatically causes a reverse
+    lookup to occur if necessary (4.13/18), there is no need to arrange for a
+    host lookup before query-style lookups in lists that might use this
+    variable. This has therefore been abolished, and the "net-" prefix is no
+    longer necessary for query-style lookups.
+
+12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
+    have been a typo for LFLAGS, so it has been changed.
+
+13. The install script calls Exim with "-C /dev/null" in order to find the
+    version number. If ALT_CONFIG_PREFIX was set, this caused an error message
+    to be output. However, since Exim outputs its version number before the
+    error, it didn't break the script. It just looked ugly. I fixed this by
+    always allowing "-C /dev/null" if the caller is root.
+
+14. Ignore overlarge ACL variable number when reading spool file - insurance
+    against a later release with more variables having written the file.
+
+15. The standard form for an IPv6 address literal was being rejected by EHLO.
+    Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
+    this, as well as the form without the "IPv6" on the front.
+
+16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
+    OS/Makefile-Darwin file.
+
+17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
+    only to LDAP libraries that do not have LDAP_OPT_DEREF.
+
+18. After change 4.21/52, "%ld" was used to format the contents of the $inode
+    variable. However, some OS use ints for inodes. I've added cast to long int
+    to get rid of the compiler warning.
+
+19. I had forgotten to lock out "/../" in configuration file names when
+    ALT_CONFIG_PREFIX was set.
+
+20. Routers used for verification do not need to specify transports. However,
+    if such a router generated a host list, and callout was configured, Exim
+    crashed, because it could not find a port number from the (non-existent)
+    transport. It now assumes port 25 in this circumstance.
+
+21. Added the -t option to exigrep.
+
+22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
+    wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
+    NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
+    them is set, LOOKUP_LSEARCH is forced.
+
+23. "exim -bV" now outputs a list of lookups that are included in the binary.
+
+24. Added sender and host information to the "rejected by local_scan()" log
+    line; previously there was no indication of these.
+
+25. Added .include_if_exists.
+
+26. Change 3.952/11 added an explicit directory sync on top of a file sync for
+    Linux. It turns out that not all file systems support this. Apparently some
+    versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
+    do it.) To cope with this, the error EINVAL, which means that sync-ing is
+    not supported on the file descriptor, is now ignored when Exim is trying to
+    sync a directory. This applies only to Linux.
+
+27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
+
+28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
+    /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
+    this.
+
+29. Added support for maildirsize files from supplied patch (modified a bit).
+
+30. The use of :fail: followed by an empty string could lead Exim to respond to
+    sender verification failures with (e.g.):
+
+      550 Verification failed for <xxx>
+      550 Sender verify failed
+
+    where the first response line was missing the '-' that indicates it is not
+    the final line of the response.
+
+31. The loop for finding the name of the user that called Exim had a hardwired
+    limit of 10; it now uses the value of finduser_retries, which is used for
+    all other user lookups.
+
+32. Added $received_count variable, available in data and not_smtp ACLs, and at
+    delivery time.
+
+33. Exim was neglecting to zero errno before one call of strtol() when
+    expanding a string and expecting an integer value. On some systems this
+    resulted in spurious "integer overflow" errors. Also, it was casting the
+    result into an int without checking.
+
+34. Testing for a connection timeout using "timeout_connect" in the retry rules
+    did not work. The code looks as if it has *never* worked, though it appears
+    to have been documented since at least release 1.62. I have made it work.
+
+35. The "timeout_DNS" error in retry rules, also documented since at least
+    1.62, also never worked. As it isn't clear exactly what this means, and
+    clearly it isn't a major issue, I have abolished the feature by treating it
+    as "timeout", and writing a warning to the main and panic logs.
+
+36. The display of retry rules for -brt wasn't always showing the error code
+    correctly.
+
+37. Added new error conditions to retry rules: timeout_A, timeout_MX,
+    timeout_connect_A, timeout_connect_MX.
+
+38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
+    to the empty sender.
+
+39. The daemon was not analysing the content of -oX till after it had closed
+    stderr and disconnected from the controlling terminal. This meant that any
+    syntax errors were only noted on the panic log, and the return code from
+    the command was 0. By re-arranging the code a little, I've made the
+    decoding happen first, so such errors now appear on stderr, and the return
+    code is 1. However, the actual setting up of the sockets still happens in
+    the disconnected process, so errors there are still only recorded on the
+    panic log.
+
+40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
+    connections (as happens on some IP stacks) was logged at start up time as
+    just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
+    it from "IPv6 and IPv4", which means that two separate sockets are being
+    used.
+
+41. The debug output for gethostbyname2() or getipnodebyname() failures now
+    says whether AF_INET or AF_INET6 was passed as an argument.
+
+42. Exiwhat output was messed up when time zones were included in log
+    timestamps.
+
+43. Exiwhat now gives more information about the daemon's listening ports,
+    and whether -tls-on-connect was used.
+
+44. The "port" option of the smtp transport is now expanded.
+
+45. A "message" modifier in a "warn" statement in a non-message ACL was being
+    silently ignored. Now an error message is written to the main and panic
+    logs.
+
+46. There's a new ACL modifier called "logwrite" which writes to a log file
+    as soon as it is encountered.
+
+47. Added $local_user_uid and $local_user_gid at routing time.
+
+48. Exim crashed when trying to verify a sender address that was being
+    rewritten to "<>".
+
+49. Exim was recognizing only a space character after ".include". It now also
+    recognizes a tab character.
+
+50. Fixed several bugs in the Perl script that creates the exim.8 man page by
+    extracting the relevant information from the specification. The man page no
+    longer contains scrambled data for the -d option, and I've added a section
+    at the front about calling Exim under different names.
+
+51. Added "extra_headers" argument to the "mail" command in filter files.
+
+52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
+    crash.
+
+53. Installed eximstats 1.29.
+
+54. Added transport_filter_timeout as a generic transport option.
+
+55. Exim no longer adds an empty Bcc: header to messages that have no To: or
+    Cc: header lines. This was required by RFC 822, but it not required by RFC
+    2822.
+
+56. Exim used to add From:, Date:, and Message-Id: header lines to any
+    incoming messages that did not have them. Now it does so only if the
+    message originates locally, that is, if there is no associated remote host
+    address. When Resent- header lines are present, this applies to the Resent-
+    lines rather than the non-Resent- lines.
+
+57. Drop incoming SMTP connection after too many syntax or protocol errors. The
+    limit is controlled by smtp_max_synprot_errors, defaulting to 3.
+
+58. Messages for configuration errors now include the name of the main
+    configuration file - useful now that there may be more than one file in a
+    list (.included file names were always shown).
+
+59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
+    for those rare installations that do not start the daemon as root or run it
+    setuid root. I've cut out the call to initgroups() if the daemon is not
+    root at that time.
+
+60. The Exim user and group can now be bound into the binary as text strings
+    that are looked up at the start of Exim's processing.
+
+61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
+
+62. Added $mailstore_basename variable.
+
+63. Installed patch to sieve.c from Michael Haardt.
+
+64. When Exim failed to open the panic log after failing to open the main log,
+    the original message it was trying to log was written to stderr and debug
+    output, but if they were not available (the usual case in production), it
+    was lost. Now it is written to syslog before the two lines that record the
+    failures to open the logs.
+
+65. Users' Exim filters run in subprocesses under the user's uid. It is
+    possible for a "deliver" command or an alias in a "personal" command to
+    provoke an address rewrite. If logging of address rewriting is configured,
+    this fails because the process is not running as root or exim. There may be
+    a better way of dealing with this, but for the moment (because 4.30 needs
+    to be released), I have disabled address rewrite logging when running a
+    filter in a non-root, non-exim process.
+
+
+Exim version 4.24
+-----------------
+
+ 1. The buildconfig auxiliary program wasn't quoting the value set for
+    HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
+    not defined. This bug was masked in 4.22 by the effect that was fixed in
+    change 4.23/1.
+
+ 2. Some messages that were rejected after a message id was allocated were
+    shown as "incomplete" by exigrep. It no longer does this for messages that
+    are rejected by local_scan() or the DATA or non-SMTP ACLs.
+
+ 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
+    have allow_domain_literals set, the ID did not get logged in the <= line.
+    Domain literals are now always recognized in Message-ID: header lines.
+
+ 4. The first argument for a ${extract expansion item is the key name or field
+    number. Leading and trailing spaces in this item were not being ignored,
+    causing some misleading effects.
+
+ 5. When deliver_drop_privilege was set, single queue runner processes started
+    manually (i.e. by the command "exim -q") or by the daemon (which uses the
+    same command in the process it spins off) were not dropping privilege.
+
+ 6. When the daemon running as "exim" started a queue runner, it always
+    re-executed Exim in the spun-off process. This is a waste of effort when
+    deliver_drop_privilege is set. The new process now just calls the
+    queue-runner function directly.
+
+
+Exim version 4.23
+-----------------
+
+ 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
+    HEADERS_CHARSET.
+
+ 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
+    ignored. Though the use of -oP was forcing the writing of a pid file, it
+    was always written to the default place.
+
+ 3. If the message "no IP address found for host xxxx" is generated during
+    incoming verification, it is now followed by identification of the incoming
+    connection (so you can more easily find what provoked it).
+
+ 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
+
+ 5. Added some features to "harden" Exim a bit more against certain attacks:
+
+    (a) There is now a build-time option called FIXED_NEVER_USERS that can
+        be put in Local/Makefile. This is like the never_users runtime option,
+        but it cannot be overridden. The default setting is "root".
+
+    (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
+        prefix string with which any file named in a -C command line option
+        must start.
+
+    (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
+        is retained for -C and -D only if the caller of Exim is root. Without
+        it, the exim user may also use -C and -D and retain privilege.
+
+    (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
+        command line option is disabled.
+
+ 6. Macro names set by the -D option must start with an upper case letter, just
+    like macro names defined in the configuration file.
+
+ 7. Added "dereference=" facility to LDAP.
+
+ 8. Two instances of the typo "uknown" in the source files are fixed.
+
+ 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
+    the Configure-Makefile script screwed up while processing it.
+
+10. Incorporated PCRE 4.4.
+
+11. The SMTP synchronization check was not operating right at the start of an
+    SMTP session. For example, it could not catch a HELO sent before the client
+    waited for the greeting. There is now a check for outstanding input at the
+    point when the greeting is written. Because of the duplex, asynchronous
+    nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
+    way, but not yet received, when the check is performed.
+
+12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
+    on TCP/IP sockets, because this apparently causes some broken clients to
+    timeout.
+
+13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
+    unchanged) from the Cygwin maintainer.
+
+14. The code for -bV that shows what is in the binary showed "mbx" when maildir
+    was supported instead of testing for mbx. Effectively a typo.
+
+15. The spa authenticator server code was not checking that the input it
+    received was valid base64.
+
+16. The debug output line for the "set" modifier in ACLs was not showing the
+    name of the variable that was being set.
+
+17. Code tidy: the variable type "vtype_string" was never used. Removed it.
+
+18. Previously, a reference to $sender_host_name did not cause a DNS reverse
+    lookup on its own. Something else was needed to trigger the lookup. For
+    example, a match in host_lookup or the need for a host name in a host list.
+    Now, if $sender_host_name is referenced and the host name has not yet been
+    looked up, a lookup is performed. If the lookup fails, the variable remains
+    empty, and $host_lookup_failed is set to "1".
+
+19. Added "eqi" as a case-independent comparison operator.
+
+20. The saslauthd authentication condition could segfault if neither service
+    nor realm was specified.
+
+21. If an overflowing value such as "2048M" was set for message_size_limit, the
+    error message that was logged was misleading, and incoming SMTP
+    connections were dropped. The message is now more accurate, and temporary
+    errors are given to SMTP connections.
+
+22. In some error situations (such as 21 above) Exim rejects all SMTP commands
+    (except RSET) with a 421 error, until QUIT is received. However, it was
+    failing to send a response to QUIT.
+
+23. The HELO ACL was being run before the code for helo_try_verify_hosts,
+    which made it impossible to use "verify = helo" in the HELO ACL. The HELO
+    ACL is now run after the helo_try_verify_hosts code.
+
+24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
+    "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
+    case-independent, so other case variants are also recognized). Apparently
+    some systems use these upper case variants.
+
+25. If more than two messages were waiting for the same host, and a transport
+    filter was specified for the transport, Exim sent two messages over the
+    same TCP/IP connection, and then failed with "socket operation on non-
+    socket" when it tried to send the third.
+
+26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
+
+27. The extern definition of crypt16() in expand.c was not being excluded when
+    the OS had its own crypt16() function.
+
+28. Added bounce_return_body as a new option, and bounce_return_size_limit
+    as a preferred synonym for return_size_limit, both as an option and as an
+    expansion variable.
+
+29. Added LIBS=-liconv to OS/Makefile-OSF1.
+
+30. Changed the default configuration ACL to relax the local part checking rule
+    for addresses that are not in any local domains. For these addresses,
+    slashes and pipe symbols are allowed within local parts, but the sequence
+    /../ is explicitly forbidden.
+
+31. SPA server authentication was not clearing the challenge buffer before
+    using it.
+
+32. log_message in a "warn" ACL statement was writing to the reject log as
+    well as to the main log, which contradicts the documentation and doesn't
+    seem right (because no rejection is happening). So I have stopped it.
+
+33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
+    However, I am unable to do any testing of this.
+
+34. Fixed an infelicity in the appendfile transport. When checking directories
+    for a mailbox, to see if any needed to be created, it was accidentally
+    using path names with one or more superfluous leading slashes; tracing
+    would show up entries such as stat("///home/ph10", 0xFFBEEA48).
+
+35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
+    contents are added to the log line that is written for every discarded
+    recipient. (Previously a log_message setting was ignored.)
+
+36. The ${quote: operator now quotes the string if it is empty.
+
+37. The install script runs exim in order to find its version number. If for
+    some reason other than non-existence or emptiness, which it checks, it
+    could not run './exim', it was installing it with an empty version number,
+    i.e. as "exim-". This error state is now caught, and the installation is
+    aborted.
+
+38. An argument was missing from the function that creates an error message
+    when Exim fails to connect to the socket for saslauthd authentication.
+    This could cause Exim to crash, or give a corrupted message.
+
+39. Added isip, isip4, and isip6 to ${if conditions.
+
+40. The ACL variables $acl_xx are now saved with the message, and can be
+    accessed later in routers, transports, and filters.
+
+41. The new lookup type nwildlsearch is like wildlsearch, except that the key
+    strings in the file are not string-expanded.
+
+42. If a MAIL command specified a SIZE value that was too large to fit into an
+    int variable, the check against message_size_limit failed. Such values are
+    now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
+    day this will have to be increased, but I don't think I want to be around
+    when emails are that large.
+
+
+
+Exim version 4.22
+-----------------
+
+ 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
+    iconv() is not standard in FreeBSD.
+
+ 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
+    IPv6 enabled. The observed symptom was a segmentation fault on return from
+    the function os_common_find_running_interfaces() in src/os.c.
+
+ 3. In the check_special_case() function in daemon.c I had used "errno" as an
+    argument name, which causes warnings on some systems. This was basically a
+    typo, since it was named "eno" in the comments!
+
+ 4. The code that waits for the clock to tick (at a resolution of some fraction
+    of a second) so as to ensure message-id uniqueness was always waiting for
+    at least one whole tick, when it could have waited for less. [This is
+    almost certainly not relevant at current processor speeds, where it is
+    unlikely to ever wait at all. But we try to future-proof.]
+
+ 5. The function that sleeps for a time interval that includes fractions of a
+    second contained a race. It did not block SIGALRM between setting the
+    timer, and suspending (a couple of lines later). If the interval was short
+    and the sigsuspend() was delayed until after it had expired, the suspension
+    never ended. On busy systems this could lead to processes getting stuck for
+    ever.
+
+ 6. Some uncommon configurations may cause a lookup to happen in a queue runner
+    process, before it forks any delivery processes. The open lookup caching
+    mechanism meant that the open file or database connection was passed into
+    the delivery process. The problem was that delivery processes always tidy
+    up cached lookup data. This could cause a problem for the next delivery
+    process started by the queue runner, because the external queue runner
+    process does not know about the closure. So the next delivery process
+    still has data in the lookup cache. In the case of a file lookup, there was
+    no problem because closing a file descriptor in a subprocess doesn't affect
+    the parent. However, if the lookup was caching a connection to a database,
+    the connection was closed, and the second delivery process was likely to
+    see errors such as "PGSQL: query failed: server closed the connection
+    unexpectedly". The problem has been fixed by closing all cached lookups
+    in a queue runner before running a delivery process.
+
+ 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
+    seem to have the "const" qualifier which it has on other OS. I've
+    parameterised it.
+
+ 8. Change 4.21/2 was too strict. It is only if there are two authenticators
+    *of the same type* (client or server) with the same public name that an
+    error should be diagnosed.
+
+ 9. When Exim looked up a host name for an IP address, but failed to find the
+    original IP address when looking up the host name (a safety check), it
+    output the message "<ip address> does not match any IP for NULL", which was
+    confusing, to say the least. The bug was that the host name should have
+    appeared instead of "NULL".
+
+10. Since release 3.03, if Exim is called by a uid other than root or the Exim
+    user that is built into the binary, and the -C or -D options is used, root
+    privilege is dropped before the configuration file is read. In addition,
+    logging is switched to stderr instead of the normal log files. If the
+    configuration then re-defines the Exim user, the unprivileged environment
+    is probably not what is expected, so Exim logs a panic warning message (but
+    proceeds).
+
+    However, if deliver_drop_privilege is set, the unprivileged state may well
+    be exactly what is intended, so the warning has been cut out in that case,
+    and Exim is allowed to try to write to its normal log files.
+
+
+Exim version 4.21
+-----------------
+
+ 1. smtp_return_error_details was not giving details for temporary sender
+    or receiver verification errors.
+
+ 2. Diagnose a configuration error if two authenticators have the same public
+    name.
+
+ 3. Exim used not to create the message log file for a message until the first
+    delivery attempt. This could be confusing when incoming messages were held
+    for policy or load reasons. The message log file is now created at the time
+    the message is received, and an initial "Received" line is written to it.
+
+ 4. The automatically generated man page for command line options had a minor
+    bug that caused no ill effects; however, a more serious problem was that
+    the procedure for building the man page automatically didn't always
+    operate. Consequently, release 4.20 contains an out-of-date version. This
+    shouldn't happen again.
+
+ 5. When building Exim with embedded Perl support, the script that builds the
+    Makefile was calling 'perl' to find its compile-time parameters, ignoring
+    any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
+
+ 6. The freeze_tell option was not being used for messages that were frozen on
+    arrival, either by an ACL or by local_scan().
+
+ 7. Added the smtp_incomplete_transaction log selector.
+
+ 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
+    was accepting AUTH without a new EHLO.
+
+ 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
+    ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
+    RFC.
+
+10. Logging of TCP/IP connections (when configured) now happens in the main
+    daemon process instead of the child process, so that the TCP/IP connection
+    count is more accurate (but it can never be perfect).
+
+11. The use of "drop" in a nested ACL was not being handled correctly in the
+    outer ACL. Now, if condition failure induced by the nested "drop" causes
+    the outer ACL verb to deny access ("accept" or "discard" after "endpass",
+    or "require"), the connection is dropped.
+
+12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
+    that yield "discard" can now be used with an "accept" or a "discard" verb,
+    but an error is generated for any others (because I can't see a useful way
+    to define what should happen).
+
+13. When an ACL is read dynamically from a file (or anywhere else), the lines
+    are now processed in the same way as lines in the Exim configuration file.
+    In particular, continuation lines are supported.
+
+14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
+
+15. Added -ti meaning -t -i.
+
+16. Check for letters, digits, hyphens, and dots in the names of dnslist
+    domains, and warn by logging if others are found.
+
+17. At least on BSD, alignment is not guaranteed for the array of ifreq's
+    returned from GIFCONF when Exim is trying to find the list of interfaces on
+    a host. The code in os.c has been modified to copy each ifreq to an aligned
+    structure in all cases.
+
+    Also, in some cases, the returned ifreq's were being copied to a 'struct
+    ifreq' on the stack, which was subsequently passed to host_ntoa(). That
+    means the last couple of bytes of an IPv6 address could be chopped if the
+    ifreq contained only a normal sockaddr (14 bytes storage).
+
+18. Named domain lists were not supported in the hosts_treat_as_local option.
+    An entry such as +xxxx was not recognized, and was treated as a literal
+    domain name.
+
+19. Ensure that header lines added by a DATA ACL are included in the reject log
+    if the ACL subsequently rejects the message.
+
+20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
+    MD5 (which is deprecated).
+
+21. When testing a filter file using -bf, Exim was writing a message when it
+    took the sender from a "From " line in the message, but it was not doing so
+    when it took $return_path from a Return-Path: header line. It now does.
+
+22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
+    with a valid header line field name (a series of printing characters
+    terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
+
+23. Changed "disc" in the source to "disk" to conform to the documentation and
+    the book and for uniformity.
+
+24. Ignore Sendmail's -Ooption=value command line item.
+
+25. When execve() failed while trying to run a command in a pipe transport,
+    Exim was returning EX_UNAVAILABLE (69) from the subprocess. However, this
+    could be confused with a return value of 69 from the command itself. This
+    has been changed to 127, the value the shell returns if it is asked to run
+    a non-existent command. The wording for the related log line suggests a
+    non-existent command as the problem.
+
+26. If received_header_text expands to an empty string, do not add a Received:
+    header line to the message. (Well, it adds a token one on the spool, but
+    marks it "old" so that it doesn't get used or transmitted.)
+
+27. Installed eximstats 1.28 (addition of -nt option).
+
+28. There was no check for failure on the call to getsockname() in the daemon
+    code. This can fail if there is a shortage of resources on the system, with
+    ENOMEM, for example. A temporary error is now given on failure.
+
+29. Contrary to the C standard, it seems that in some environments, the
+    equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
+    program. Exim now does this explicitly; it affects the formatting of
+    timestamps using strftime().
+
+30. If exiqsumm was given junk data, it threw up some uninitialized variable
+    complaints. I've now initialized all the variables, to avoid this.
+
+32. Header lines added by a system filter were not being "seen" during
+    transport-time rewrites.
+
+33. The info_callback() function passed to OpenSSL is set up with type void
+    (*)(SSL *, int, int), as described somewhere. However, when calling the
+    function (actually a macro) that sets it up, the type void(*)() is
+    expected. I've put in a cast to prevent warnings from picky compilers.
+
+34. If a DNS black list lookup found a CNAME record, but there were no A
+    records associated with the domain it pointed at, Exim crashed.
+
+35. If a DNS black list lookup returned more than one A record, Exim ignored
+    all but the first. It now scans all returned addresses if a particular IP
+    value is being sought. In this situation, the contents of the
+    $dnslist_value variable are a list of all the addresses, separated by a
+    comma and a space.
+
+36. Tightened up the rules for host name lookups using reverse DNS. Exim used
+    to accept a host name and all its aliases if the forward lookup for any of
+    them yielded the IP address of the incoming connection. Now it accepts only
+    those names whose forward lookup yields the correct IP address. Any other
+    names are discarded. This closes a loophole whereby a rogue DNS
+    administrator could create reverse DNS records to break through a
+    wildcarded host restriction in an ACL.
+
+37. If a user filter or a system filter that ran in a subprocess used any of
+    the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
+    the wrong values were passed to the pipe command ($thisaddress had the
+    value of $0, $0 had the value of $1, etc). This bug was introduced by
+    change 4.11/101, and not discovered because I wrote an inadequate test. :-(
+
+38. Improved the line breaking for long SMTP error messages from ACLs.
+    Previously, if there was no break point between 40 and 75 characters, Exim
+    left the rest of the message alone. Two changes have been made: (a) I've
+    reduced the minimum length to 35 characters; (b) if it can't find a break
+    point between 35 and 75 characters, it looks ahead and uses the first one
+    that it finds. This may give the occasional overlong line, but at least the
+    remaining text gets split now.
+
+39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
+    file descriptors might be low, and that setting 1000 would always raise it.
+    It turns out that in some environments, the limit is already over 1000 and
+    that lowering it causes trouble. So now Exim takes care not to decrease it.
+
+40. When delivering a message, the value of $return_path is set to $sender_
+    address at the start of routing (routers may change the value). By an
+    oversight, this default was not being set up when an address was tested by
+    -bt or -bv, which affected the outcome if any router or filter referred to
+    $return_path.
+
+41. The idea of the "warn" ACL verb is that it adds a header or writes to the
+    log only when "message" or "log_message" are set. However, if one of the
+    conditions was an address verification, or a call to a nested ACL, the
+    messages generated by the underlying test were being passed through. This
+    no longer happens. The underlying message is available in $acl_verify_
+    message for both "message" and "log_message" expansions, so it can be
+    passed through if needed.
+
+42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
+    new expansion $bh_ to give the encoded byte string without charset
+    translation. Translation happens only if iconv() is available; HAVE_ICONV
+    indicates this at build time. HEADERS_CHARSET gives the charset to
+    translate to; headers_charset can change it in the configuration, and
+    "headers charset" can change it in an individual filter file.
+
+43. Now that we have a default RFC 2047 charset (see above), the code in Exim
+    that creates RFC 2047 encoded "words" labels them as that charset instead
+    of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
+    expansion operator; (ii) when Exim creates a From: line for a local
+    message; (iii) when a header line is rewritten to include a "phrase" part.
+
+44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
+    buggy, causing it to skip the first lines of messages whose message ID
+    ended in 'D'. This would not have bitten before Exim release 4.14, because
+    message IDs were unlikely to end in 'D' before then. The effect was to have
+    incorrect size information for certain domains.
+
+45. #include "config.h" was missing at the start of the crypt16.c module. This
+    caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
+    noticed.
+
+46. If there was a timeout during a "random" callout check, Exim treated it as
+    a failure of the random address, and carried on sending RSET and the real
+    address. If the delay was just some slowness somewhere, the response to the
+    original RCPT would be taken as a response to RSET and so on, causing
+    mayhem of various kinds.
+
+47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
+    when I implemented it. It didn't allow for the fact that some option values
+    may legitimately be negative (e.g. size_addition), and it didn't even do
+    the right test for positive values.
+
+48. Domain names in DNS records are case-independent. Exim always looks them up
+    in lower case. Some resolvers return domain names in exactly the case they
+    appear in the zone file, that is, they may contain uppercase letters. Not
+    all resolvers do this - some return always lower case. Exim was treating a
+    change of case by a resolver as a change of domain, similar to a widening
+    of a domain abbreviation. This triggered its re-routing code and so it was
+    trying to route what was effectively the same domain again. This normally
+    caused routing to fail (because the router wouldn't handle the domain
+    twice). Now Exim checks for this case specially, and just changes the
+    casing of the domain that it ultimately uses when it transmits the message
+    envelope.
+
+49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
+    module.
+
+50. If a filter generated a file delivery with a non-absolute name (possible if
+    no home directory exists for the router), the forbid_file option was not
+    forbidding it.
+
+51. Added '&' feature to dnslists, to provide bit mask matching in addition to
+    the existing equality matching.
+
+52. Exim was using ints instead of ino_t variables in some places where it was
+    dealing with inode numbers.
+
+53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
+    TMPDIR="/tmp"), Exim checks for the presence of an environment variable
+    called TMPDIR, and if it finds it is different, it changes its value.
+
+54. The smtp_printf() function is now made available to local_scan() so
+    additional output lines can be written before returning. There is also an
+    smtp_fflush() function to enable the detection of a dropped connection.
+    The variables smtp_input and smtp_batched_input are exported to
+    local_scan().
+
+55. Changed the default runtime configuration: the message "Unknown user"
+    has been removed from the ACL, and instead placed on the localuser router,
+    using the cannot_route_message feature. This means that any verification
+    failures that generate their own messages won't get overridden. Similarly,
+    the "Unrouteable address" message that was in the ACL for unverifiable
+    relay addresses has also been removed.
+
+56. Added hosts_avoid_esmtp to the smtp transport.
+
+57. The exicyclog script was not checking for the esoteric option
+    CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
+    will work only if exicyclog is run under the appropriate euid.
+
+58. Following a discussion on the list, the rules by which Exim recognises line
+    endings on incoming messages have been changed. The -dropcr and drop_cr
+    options are now no-ops, retained only for backwards compatibility. The
+    following line terminators are recognized: LF CRLF CR. However, special
+    processing applies to CR:
+
+    (i)  The sequence CR . CR does *not* terminate an incoming SMTP message,
+         nor a local message in the state where . is a terminator.
+
+    (ii) If a bare CR is encountered in a header line, an extra space is added
+         after the line terminator so as not to end the header. The reasoning
+         behind this is that bare CRs in header lines are most likely either
+         to be mistakes, or people trying to play silly games.
+
+59. The size of a message, as listed by "-bp" or in the Exim monitor window,
+    was being incorrectly given as 18 bytes larger than it should have been.
+    This is a VOB (very old bug).
+
+60. This may never have affected anything current, but just in case it has:
+    When the local host is found other than at the start of a list of hosts,
+    the local host, those with the same MX, and any that follow, are discarded.
+    When the list in question was part of a longer list of hosts, the following
+    hosts (not currently being processed) were also being discarded. This no
+    longer happens. I'm not sure if this situation could ever has previously
+    arisen.
+
+61. Added the "/MX" feature to lists of hosts in the manualroute and query
+    program routers.
+
+62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
+    header. This is something that is recommended in a new Internet Draft, and
+    is something that is documented as being done by Sendmail. There are two
+    possible values. For messages generated by the autoreply transport, Exim
+    adds:
+
+      Auto-Submitted: auto-replied
+
+    whereas for all other generated messages (e.g. bounces) it adds
+
+      Auto-Submitted: auto-generated
+
+63. The "personal" condition in filters now includes a test for the
+    Auto-Submitted: header. If it contains the string "auto-" the message it
+    not considered personal.
+
+64. Added rcpt_include_affixes as a generic transport option.
+
+65. Added queue_only_override (default true).
+
+66. Added the syslog_duplication option.
+
+67. If what should have been the first header line of a message consisted of
+    a space followed by a colon, Exim was mis-interpreting it as a header line.
+    It isn't of course - it is syntactically invalid and should therefore be
+    treated as the start of the message body. The misbehaviour could have
+    caused a number of strange effects, including loss of data in subsequent
+    header lines, and spool format errors.
+
+68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
+    client host had authenticated. This control can now be exercised by an ACL
+    for more flexibility.
+
+69. By default, callouts do not happen when testing with -bh. There is now a
+    variant, -bhc, which does actually run the callout code, including
+    consulting and updating the callout cache.
+
+70. Added support for saslauthd authentication, courtesy of Alexander
+    Sabourenkov.
+
+71. If statvfs() failed on the spool or log directories while checking their
+    size for availability, Exim confusingly gave the error "space shortage".
+    Furthermore, in debugging mode it crashed with a floating point exception.
+    These checks are done if check_{spool,log}_{space,inodes} are set, and when
+    an SMTP message arrives with SIZE= on the MAIL command. As this is a really
+    serious problem, Exim now writes to the main and panic logs when this
+    happens, with details of the failure. It then refuses to accept the
+    incoming message, giving the message "spool directory problem" or "log
+    directory problem" with a 421 code for SMTP messages.
+
+72. When Exim is about to re-exec itself, it ensures that the file descriptors
+    0, 1, and 2 exist, because some OS complain for execs without them (see
+    ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
+    descriptors. However, the code omitted to check that the open succeeded,
+    causing mysterious errors if for some reason the permissions on /dev/null
+    got screwed. Now Exim writes a message to the main and panic logs, and
+    bombs out if it can't open /dev/null.
+
+73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
+    interact so that it is all more flexible. It is supposed to remain
+    backwards compatible. Also added extra_local_interfaces.
+
+74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
+    to bomb out with an assertion failure - to the client this appears as a
+    connection drop. This problem occurs in the part of the code that was taken
+    from the Samba project. Fortunately, the assertion is in a very simple
+    function, so I have fixed this by reproducing the function inline in the
+    one place where it is called, and arranging for authentication to fail
+    instead of killing the process with assert().
+
+75. The SPA client code was not working when the server requested OEM rather
+    than Unicode encoding.
+
+76. Added code to make require_files with a specific uid setting more usable in
+    the case where statting the file as root fails - usually a non-root-mounted
+    NFS file system. When this happens and the failure is EACCES, Exim now
+    forks a subprocess and does the per-uid checking as the relevant uid.
+
+77. Added process_log_path.
+
+78. If log_file_path was not explicitly set, a setting of check_log_space or
+    check_log_inodes was ignored.
+
+79. If a space check for the spool or log partitions fails, the incident is now
+    logged. Of course, in the latter case the data may get lost...
+
+80. Added the %p formatting code to string_format() so that it can be used to
+    print addresses in debug_print(). Adjusted all the address printing in the
+    debugging in store.c to use %p rather than %d.
+
+81. There was a concern that a line of code in smtp_in.c could overflow a
+    buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
+    initially expressed, the concern was not well-founded, because trailing
+    spaces are removed early. However, if the trailing spaces were followed by
+    a NULL, they did not get removed, so the overflow was possible. Two fixes
+    were applied:
+
+    (a) I re-wrote the offending code in a cleaner fashion.
+    (b) If an incoming SMTP command contains a NULL character, it is rejected
+        as invalid.
+
+82. When Exim changes uid/gid to the Exim user at daemon start time, it now
+    runs initgroups(), so that if the Exim user is in any additional groups,
+    they will be used during message reception.
+
+
+Exim version 4.20
+-----------------
+
+The change log for 4.20 and earlier releases has been archived.
+
+****