Postfix stable releases 2.5.6, 2.4.10 and 2.3.16 catch up on fixes
that were applied in the past three months. Postfix versions 2.2
and earlier are no longer updated.
 
- Postfix 2.5: the SMTP server did not ask for a client certificate
with "smtpd_tls_req_ccert = yes". Reported by Rob Foehl.

- Postfix 2.5, 2.4 and 2.3: avoid reduced TCP performance when
reusing an SMTP connection with a larger than 4096-byte TCP MSS
value. In practice, this could happen only with loopback (localhost)
connections.

- Postfix 2.3: the cleanup server did not update the queue file's
recipient count field, after a Milter application added or deleted
a recipient. This resulted in harmless "rcpt count mismatch" warning
messages from the Postfix queue manager. Reported by Matthew Sullivan
(Sorbs). Fix back-ported from Postfix 2.4.

The first version of these releases suffered from a cut-and-paste
error in file smtp_reuse.c. Corrected versions have been issued
in the mean time.

The updated files should show up in the next 12 hours on the mirror
sites listed at http://www.postfix.org/

    Wietse