Postfix 2.9.2, 2.8.11, 2.7.10, 2.6.16 available

[An on-line version of this announcement will be available at
http://www.postfix.org/announcements/postfix-2.9.3.html]

Postfix stable release 2.9.3, and legacy releases 2.8.11, 2.7.10,
2.6.16 are available. They contains workarounds that are already
part of Postfix 2.10.

  * OpenSSL related (all supported Postfix versions).

      o Some people have reported program crashes when the OpenSSL
        library was updated while Postfix was accessing the Postfix
        TLS session cache. To avoid this, the Postfix TLS session
        cache ID now includes the OpenSSL library version number.
        This cache ID is not shared via the network.

      o The OpenSSL workaround introduced with the previous stable
        and legacy releases did not compile with older gcc compilers.
        These compilers can't handle #ifdef inside a macro invocation
        (NOT: definition).

  * Postfix 2.9 only.

      o The postconf command flagged parameter "-o name=value"
        settings in master.cf as "unused" when those settings were
        used only in main.cf. Problem reported by Michael Tokarev.

  * postscreen(8) related (Postfix 2.9, Postfix 2.8).

      o To avoid repeated warnings from postscreen(8) with "connect
        to private/dnsblog service: Connection refused" on FreeBSD,