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+The stable Postfix release is called postfix-2.4.x where 2=major
+release number, 4=minor release number, x=patchlevel.  The stable
+release never changes except for patches that address bugs or
+emergencies. Patches change the patchlevel and the release date.
+
+New features are developed in snapshot releases. These are called
+postfix-2.5-yyyymmdd where yyyymmdd is the release date (yyyy=year,
+mm=month, dd=day).  Patches are never issued for snapshot releases;
+instead, a new snapshot is released.
+
+The mail_release_date configuration parameter (format: yyyymmdd)
+specifies the release date of a stable release or snapshot release.
+
+Major changes - critical
+------------------------
+
+See RELEASE_NOTES-2.3 if you upgrade from Postfix 2.2 or earlier.
+
+[Incompat 20070122] To take advantage of the new support for BSD
+kqueue, Linux epoll, or Solaris /dev/poll, you must restart (not
+reload) Postfix after upgrading from Postfix 2.3.
+
+[Incompat 20061209] If you upgrade Postfix without restarting, you
+MUST execute "postfix reload", otherwise the queue manager may log
+a warnings with:
+
+    warning: connect to transport retry: Connection refused
+
+[Incompat 20061209] The upgrade procedure adds a new "retry" service
+to the master.cf file.  If you make the mistake of copying old
+Postfix configuration files over the new files, the queue manager
+may log warnings with:
+
+    warning: connect to transport retry: Connection refused
+
+To fix your master.cf file, use "postfix upgrade-configuration"
+followed by "postfix reload".
+
+Major changes - safety
+----------------------
+
+[Incompat 20070222] As a safety measure, Postfix now by default
+creates mailbox dotlock files on all systems. This prevents problems
+with GNU POP3D which subverts kernel locking by creating a new
+mailbox file and deleting the old one.
+
+Major changes - Milter support
+------------------------------
+
+[Feature 20070121] The support for Milter header modification
+requests was revised.  With minimal change in the on-disk representation,
+the code was greatly simplified, and regression tests were updated
+to ensure that old errors were not re-introduced.  The queue file
+format is entirely backwards compatible with Postfix 2.3.
+
+[Feature 20070116] Support for Milter requests to replace the message
+body.  Postfix now implements all the header/body modification
+requests that are available with Sendmail 8.13.
+
+[Incompat 20070116] A new field is added to the queue file "size"
+record that specifies the message content length.  Postfix 2.3 and
+older Postfix 2.4 snapshots will ignore this field, and will report
+the message size as it was before the body was replaced.
+
+Major changes - TLS support
+---------------------------
+
+[Incompat 20061214] The check_smtpd_policy client sends TLS certificate
+attributes (client ccert_subject, ccert_issuer) only after successful
+client certificate verification. The reason is that the certification
+verification status itself is not available in the policy request.
+
+[Incompat 20061214] The check_smtpd_policy client sends TLS certificate
+fingerprint information even when the certificate itself was not
+verified.
+
+[Incompat 20061214] The remote SMTP client TLS certificate fingerprint
+can be used for access control even when the certificate itself was
+not verified.
+
+[Incompat 20061006] The format of SMTP server TLS session cache
+lookup keys has changed.  The lookup key now includes the master.cf
+service name.
+
+Major changes - performance
+---------------------------
+
+[Feature 20070212] Better support for systems that run thousands
+of Postfix processes.  Postfix now supports FreeBSD kqueue(2),
+Solaris poll(7d) and Linux epoll(4) as more scalable alternatives
+to the traditional select(2) system call, and uses poll(2) when
+examining a single file descriptor for readability or writability.
+These features are supported on sufficiently recent versions of
+FreeBSD, NetBSD, OpenBSD, Solaris and Linux; support for other
+systems will be added as evidence becomes available that usable
+implementations exist.
+
+[Incompat 20070201] Some default settings have been adjusted to
+better match contemporary requirements:
+
+- queue_run_delay and minimal_backoff_time were reduced from 1000s
+  to 300s so that deliveries are retried earlier after the first
+  failure.
+
+- ipc_idle was reduced from 100s to 5s, so that tlsmgr and scache
+  clients will more quickly release unused file handles.
+
+[Feature 20061209] Improved worst-case (old and new) queue manager
+performance when deferring or bouncing large amounts of mail. Instead
+of talking to the bounce or defer service synchronously, this work
+is now done in the background by the error or retry service.
+
+[Feature 20061209] Improved worst-case (new) queue manager performance
+when delivering multi-recipient mail. The queue manager now proactively
+reads recipients from the queue file, instead of waiting for the
+slowest deliveries to complete before reading in new recipients.
+This introduces two parameters: default_recipient_refill_limit (how
+many recipient slots to refill at a time) and
+default_recipient_refill_delay (how long to wait between refill
+operations). These two parameters act as defaults for optional
+per-transport settings.
+
+Major changes - delivery status notifications
+---------------------------------------------
+
+[Incompat 20061209] Small changes were made to the default bounce
+message templates, to prevent HTML-aware software from hiding or
+removing the text "<postmaster>", and producing misleading text.
+
+[Incompat 20060806] Postfix no longer announces its name in delivery
+status notifications.  Users believe that Wietse provides a free
+help desk service that solves all their email problems.
+
+Major changes - ETRN support
+----------------------------
+
+[Feature 20061217] More precise queue flushing with the ETRN,
+"postqueue -s site", and "sendmail -qRsite" commands, after
+minimization of race conditions.  New per-queue-file flushing with
+"postqueue -i queueid" and "sendmail -qIqueueid".
+
+Major changes - small office/home office support
+------------------------------------------------
+
+[Incompat 20061217] Postfix no longer requires a domain name. It
+uses "localdomain" as the default Internet domain name when no
+domain is specified via main.cf or via the machine's hostname.
+
+Major changes - SMTP access control
+-----------------------------------
+
+[Incompat 20061214] The check_smtpd_policy client sends TLS certificate
+attributes (client ccert_subject, ccert_issuer) only after successful
+client certificate verification. The reason is that the certification
+verification status itself is not available in the policy request.
+
+[Incompat 20061214] The check_smtpd_policy client sends TLS certificate
+fingerprint information even when the certificate itself was not
+verified.
+
+[Incompat 20061214] The remote SMTP client TLS certificate fingerprint
+can be used for
+access control even when the certificate itself was not verified.
+
+[Incompat 20061209] The Postfix installation procedure no longer
+updates main.cf with "unknown_local_recipient_reject_code = 450".
+Four years after the introduction of mandatory recipient validation,
+this transitional tool is no longer neeed.
+
+Major changes - workarounds
+---------------------------
+
+[Incompat 20070222] As a safety measure, Postfix now by default
+creates mailbox dotlock files on all systems. This prevents problems
+with GNU POP3D which subverts kernel locking by creating a new
+mailbox file and deleting the old one.
+
+[Feature 20061209] Better interoperability with non-conforming SMTP
+servers that reply and disconnect before Postfix has sent the
+complete message content.
+
+[Feature 20061209] Better support for queue file systems on file
+servers with drifting clocks. Clock skew can be a problem, because
+Postfix does not deliver mail until the local clock catches up with
+the queue file's last modification time stamp. On systems with
+usable futimes() or equivalent (Solaris, *BSD, MacOS, but not Linux),
+Postfix now always explicitly sets the queue file last modification
+time stamps while creating a queue file.  On systems without usable
+futimes() (Linux, and ancient versions of Solaris, SunOS and *BSD)
+Postfix keeps using the slower utime() system call to update queue
+file time stamps when the file system clock is off with respect to
+the local system clock, and logs a warning.
+
+[Feature 20061006] Individual CISCO PIX bug workarounds are now
+on/off configurable.  This introduces new parameters: smtp_pix_workarounds
+(default: disable_esmtp, delay_dotcrlf) and smtp_pix_workaround_maps
+(workarounds indexed by server IP address).  The default settings
+are backwards compatible.