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List:       postfix-announce
Subject:    Postfix non-beta Release 20010228
From:       wietse () porcupine ! org (Wietse Venema)
Date:       2001-02-28 21:16:43
[Download RAW message or body]

Postfix Release 20010228 is available. This is the first NON-BETA
release. May it help the people who cannot get BETA software past
the people who cannot get BETA software past their management.

Release 20010228 differs from snapshot 20010228 in that the virtual
delivery agent and nqmgr queue manager are left out. That software
will become part of the official release when it has not changed
in a while. Otherwise the code is identical.

Primary site:

    ftp://ftp.porcupine.org/mirrors/postfix-release/official

      169439 Feb 28 11:16 release-20010228.HISTORY
       33250 Feb 28 14:54 release-20010228.RELEASE_NOTES
      973564 Feb 28 14:59 release-20010228.tar.gz
         152 Feb 28 14:59 release-20010228.tar.gz.sig

Or point your web browser to the download web page at:

    ftp://ftp.porcupine.org/mirrors/postfix-release/index.html

Below the signature is a list of incompatibilities and of other
changes since Postfix version 19991231.

        Wietse

In the text below, incompatible changes are labeled with the Postfix
version that introduced the change. If you upgrade from a later
Postfix version, then you do not have to worry about that particular

Major incompatible changes with release-20010228
================================================

[snapshot-20010225] POSTFIX NO LONGER RELAYS MAIL FOR CLIENTS IN
THE ENTIRE CLASS A/B/C NETWORK. To get the old behavior, specify
"mynetworks_style = class" in the main.cf file. The default
(mynetworks_style = subnet) is to relay for clients in the local
IP subnet. See conf/main.cf.

[snapshot-20001005, snapshot-20010225] You must execute "postfix
stop" before installing this release.  Some recommended parameter
settings have changed, and a new entry must be added to the master.cf
file before you can start Postfix again.

1 - The recommended Postfix configuration no longer uses flat
    directories for the "incoming" "active", "bounce", and "defer"
    queue directories.  The "flush" directory for the new "flush"
    service directory should not be flat either.

    Upon start-up, Postfix checks if the hash_queue_names configuration
    parameter is properly set up, and will add any queue directory
    names that are missing.

2 - In order to improve performance of one-to-one mail deliveries
    the queue manager will now look at up to 10000 queue files
    (was: 1000).  The default qmgr_message_active_limit setting
    was changed accordingly.

    If you have a non-default qmgr_message_active_limit in main.cf,
    you may want adjust it.

3 - The new "flush" service needs to be configured in master.cf.

    Upon start-up, Postfix checks if the new "flush" service is
    configured in the master.cf file, and will add an entry if it
    is missing.

Should you wish to back out to a previous Postfix release there is
no need to undo the above queue configuration changes.

[snapshot-20000921] The protocol between queue manager and delivery
agents has changed.  This means that you cannot mix the Postfix
queue manager or delivery agents with those of Postfix versions
prior to 20000921. This change does not affect Postfix queue file
formats.

[snapshot-20000529] This release introduces an incompatible queue
file format change ONLY when content filtering is enabled (see text
in FILTER_README). Old Postfix queue files will work fine, but
queue files with the new content filtering info will not work with
Postfix versions before 20000529.  Postfix logs a warning and moves
incompatible queue files to the "corrupt" mail queue subdirectory.

Minor incompatible changes with release-20010228
================================================

[snapshot-20010225] The incoming and deferred queue directories
are now hashed by default.  This improves the performance considerably
under heavy load, at the cost of a small but noticeable slowdown
when one runs "mailq" on an unloaded system.

[snapshot-20010222] Postfix no longer automatically delivers
recipients one at a time when their domain is listed in $mydestination.
This change solves delivery performance problems with delivery via
LMTP, with virus scanning, and with firewall relays that forward
all mail for $mydestination to an inside host.

The "one recipient at a time" delivery behavior is now controlled
by the per-transport recipient limit (xxx_destination_recipient_limit,
where xxx is the name of the delivery mechanism).  This parameter
controls the number of recipients that can be sent in one delivery
(surprise).

The setting of the per-transport recipient limit also controls the
meaning of the per-transport destination concurrency limit (named
xxx_destination_concurrency_limit, where xxx is again the name of
the delivery mechanism):

 1) When the per-transport recipient limit is 1 (i.e., send one
    recipient per delivery), the per-transport destination concurrency
    limit controls the number of simultaneous deliveries to the
    same recipient.  This is the default behavior for delivery via
    the Postfix local delivery agent.

 2) When the per-transport recipient limit is > 1 (i.e., send
    multiple recipients per delivery), the per-transport destination
    concurrency limit controls the number of simultaneous deliveries
    to the same domain.  This is the default behavior for all other
    Postfix delivery agents.

[snapshot-20010128] The Postfix local delivery agent now enforces
mailbox file size limits (default: mailbox_size_limit = 51200000).
This limit affects all file write access by the local delivery
agent or by a process run by the local delivery agent. The purpose
of this parameter is to act as a safety for run-away software. It
cannot be a substitute for a file quota management system. Specify
a limit of 0 to disable.

[snapshot-20010128] REJECT in header/body_checks is now flagged as
policy violation rather than bounce, for consistency in postmaster
notifications.

[snapshot-20010128] The default RBL (real-time blackhole lists)
domain examples have been changed from *.vix.com to *.mail-abuse.org.

[snapshot-20001210] Several interfaces of libutil and libglobal
routines have changed.  This may break third-party code written
for Postfix. In particular, the safe_open() routine has changed,
the way the preferred locking method is specified in the sys_defs.h
file, as well as all routines that perform file locking. When
compiling third-party code written for Postfix, the incompatibilities
will be detected by the compiler provided that #include file
dependencies are properly maintained.

[snapshot-20001210] When delivering to /file/name (as directed in
an alias or .forward file), the local delivery agent now logs a
warning when it is unable to create a /file/name.lock file. Mail
is still delivered as before.

[snapshot-20001210] The "sun_mailtool_compatibility" feature is
going away (a compatibility mode that turns off kernel locks on
mailbox files). It still works, but a warning is logged. Instead
of using "sun_mailtool_compatibility", specify the mailbox locking
strategy as "mailbox_delivery_lock = dotlock".

[snapshot-20001210] The Postfix SMTP client now skips SMTP server
replies that do not start with "CODE SPACE" or with "CODE HYPHEN"
and flags them as protocol errors. Older Postfix SMTP clients
silently treated "CODE TEXT" as "CODE SPACE TEXT", i.e. as a valid
SMTP reply.

[snapshot-20001121] On RedHat Linux 7.0, you must install the
db3-devel RPM before you can compile the Postfix source code.

[snapshot-20000924] The postmaster address in the "sorry" text at
the top of bounced mail is now just postmaster, not postmaster@machine.
The idea is to refer users to their own postmaster.

[snapshot-20000921] The notation of [host:port] in transport tables
etc. is going away but it is still supported. The preferred form
is now [host]:port.  This change is necessary to support IPV6
address forms which use ":" as part of a numeric IP address. In a
future release, Postfix will log a warning when it encounters the
[host:port] form.

[snapshot-20000921] In mail headers, Errors-To:, Reply-To: and
Return-Receipt:  addresses are now rewritten as a sender address
(was: recipient).

[snapshot-20000921] Postfix no longer inserts Sender: message
headers.

[snapshot-20000921] The queue manager now logs the original number
of recipients when opening a queue file (example: from=<>, size=3502,
nrcpt=1).

[snapshot-20000921] The local delivery agent no longer appends a
blank line to mail that is delivered to external command.

[snapshot-20000921] The pipe delivery agent no longer appends a
blank line when the F flag is specified (in the master.cf file).
Specify the B flag if you need that blank line.

[snapshot-20000507] As required by RFC 822, Postfix now inserts a
generic destination message header when no destination header is
present.  The text is specified via the undisclosed_recipients_header
configuration parameter (default:  "To: undisclosed-recipients:;").

[snapshot-20000507] The Postfix sendmail command treats a line with
only `.' as the end of input, for the sake of sendmail compatibility.
To disable this feature, specify the sendmail-compatible `-i' or
`-oi' flags on the sendmail command line.

[snapshot-20000507] For the sake of Sendmail compatibility, the
Postfix SMTP client skips over SMTP servers that greet with a 4XX
or 5XX reply code, treating them as unreachable servers.  To obtain
prior behavior (4XX=retry, 5XX=bounce), specify "smtp_skip_4xx_greeting
= no" and "smtp_skip_5xx_greeting = no".

Major changes with release-20010228
===================================

Postfix produces DSN formatted bounced/delayed mail notifications.
The human-readable text still exists, so that users will not have
to be unnecessarily confused by all the ugliness of RFC 1894.  Full
DSN support will be later.

This release introduces full content filtering through an external
process. This involves an incompatible change in queue file format.
Mail is delivered to content filtering software via an existing
mail delivery agent, and is re-injected into Postfix via an existing
mail submission agent.  See examples in the FILTER_README file.
Depending on how the filter is implemented, you can expect to lose
a factor of 2 to 4 in delivery performance of SMTP transit mail,
more if the content filtering software needs lots of CPU or memory.

Specify "body_checks = regexp:/etc/postfix/body_checks" for a quick
and dirty emergency content filter that looks at non-header lines
one line at a time (including MIME headers inside the message body).
Details in conf/sample-filter.cf.

The header_checks and body_checks features can be used to strip
out unwanted data. Specify IGNORE on the right-hand side and the
data will disappear from the mail.

Support for SASL (RFC 2554) authentication in the SMTP server and
in the SMTP and LMTP clients. See the SASL_README file for more
details. This file still needs better examples.

Postfix now ships with an LMTP delivery agent that can deliver over
local/remote TCP sockets and over local UNIX-domain sockets.  The
LMTP_README file gives example, but still needs to be revised.

Fast "ETRN" and "sendmail -qR".  Postfix maintains per-destination
logfiles with information about what mail is queued for selected
destinations.  See the file ETRN_README for details.

The mailbox locking style is now fully configurable at runtime.
The new configuration parameter is called "mailbox_delivery_lock".
Depending on the operating system type, mailboxes can be locked
with one or more of "flock", "fcntl" or "dotlock".  The command
"postconf -l" shows the available locking styles.  The default
mailbox locking style is system dependent.  This change affects
all mailbox and all "/file/name" deliveries by the Postfix local
delivery agent.

Minor changes with release-20010228
===================================

You can now specify multiple SMTP destinations in the relayhost
and fallback_relay configuration parameters. The destinations are
tried in the specified order. Specify host or host:port (perform
MX record lookups), [host] or [host]:port (no MX record lookups),
[address] or [address]:port (numerical IP address).

The "mailbox_transport" and "fallback_transport" parameters now
understand the form "transport:nexthop", with suitable defaults
when either transport or nexthop are omitted, just like in the
Postfix transport map. This allows you to specify for example,
"mailbox_transport = lmtp:unix:/file/name".

The local_transport and default_transport configuration parameters
can now be specified in transport:destination notation, just like
the mailbox_transport and fallback_transport parameters.  The
:destination part is optional.  However, these parameters take only
one destination, unlike relayhost and fallback-relay which take
any number of destinations.

More general virtual domain support.  Postfix now supports both
Sendmail-style virtual domains and Postfix-style virtual domains.
Details and examples are given in the revised virtual manual page.

- With Sendmail-style virtual domains, local users/aliases/mailing
  lists are visible as localname@virtual.domain. This is convenient
  if you want to host mailing lists under virtual domains.

- With Postfix-style virtual domains, local users/aliases/mailing
  lists are not visible as localname@virtual.domain. Each virtual
  domain has its own separate name space.

More general "soft bounce" feature.  Specify "soft_bounce = yes"
in main.cf to prevent the SMTP server from bouncing mail while you
are testing configurations. Until this release the SMTP server was
not aware of soft bounces.

Workarounds for non-standard RFC 2554 (AUTH command) implementations.
Specify "broken_sasl_auth_clients = yes" to enable SMTP server
support for old Microsoft client applications. The Postfix SMTP
client supports non-standard RFC 2554 servers by default.

All time-related configuration parameters now accept a one-letter
suffix to indicate the time unit (s: second, m: minute, h: hour,
d: day, w: week). The exceptions are the LDAP and MYSQL modules
which are maintained separately.

New "import_environment" and "export_environment" configuration
parameters provide explicit control over what environment variables
Postfix will import, and what environment variables Postfix will
pass on to a non-Postfix process.

In order to improve performance of one-to-one deliveries, Postfix
by default now looks at up to 10000 messages at a time (was: 1000).

Specify "syslog_facility = log_local1" etc. to separate the logging
from multiple Postfix instances. However, a non-default logging
facility takes effect only after process initialization. Errors
during command-line parsing are still logged with the default syslog
facility, as are errors while processing the main.cf file.

Postfix now strips out Content-Length: headers in incoming mail to
avoid confusion in mail user agents.

Specify "require_home_directory = yes" to prevent mail from being
delivered to a user whose home directory is not mounted. This
feature is implemented by the Postfix local delivery agent.

The pipe mailer has a size limit (size=nnn) command-line argument.

The pipe delivery agent has a configurable end-of-line attribute.
Specify "pipe ... eol=\r\n" for delivery mechanisms that require
CRLF record delimiters. The eol attribute understands the following
C-style escape sequences:  \a \b \f \n \r \t \v \nnn \\.

In master.cf you can selectively override main.cf configuration
parameters, for example: "smtpd -o myhostname=foo.com".

In main.cf, specify "smtp_bind_address=x.x.x.x" to bind SMTP
connections to a specific local interface. Or override the default
setting in master.cf with "smtp -o smtp_bind_address=x.x.x.x".
For now, you must specify a numeric IP address.

Questionable feature: with "smtp_always_send_ehlo = yes", the SMTP
client sends EHLO regardless of the content of the SMTP server's
greeting.

Specify "-d key" to postalias or postmap in order to remove one
key. This still needs to be generalized to multi-key removal (e.g.,
read keys from stdin).

Comments in Postfix configuration files no longer contain troff
formatting codes.  The text is now generated from prototype files
in a new "proto" subdirectory.

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