[An on-line version of this announcement will be available at http://www.postfix.org/announcements/postfix-2.7.5.html]
Postfix legacy releases 2.7.5, 2.6.11 and 2.5.14 are available. These contain fixes and workarounds that were already included with Postfix stable release 2.8.4.
Fixed with Postfix version 2.7.5, 2.6.11 and 2.5.14:
Performance: a high load of DSN success notification requests could slow down the queue manager. Solution: make the trace client asynchronous, just like the bounce and defer clients.
The local(8) delivery agent ignored table lookup errors in mailbox_command_maps, mailbox_transport_maps, fallback_transport_maps and (while bouncing mail to alias) alias owner lookup.
Workaround: dbl.spamhaus.org rejects lookups with "No IP queries" even if the name has an alphanumerical prefix. We play safe, and skip both RHSBL and RHSWL queries for names ending in a numerical suffix.
The Postfix Milter client reported a temporary error instead of "file too large" in three cases.
Linux kernel version 3 support. Linus Torvalds has reset the counters for reasons not related to changes in code.
Fixed with Postfix 2.7.5:
The "sendmail -t" command reported "protocol error" instead of "file too large", "no space left on device" etc.
You can find the updated Postfix source code at the mirrors listed at http://www.postfix.org/.