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.
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