[An on-line version of this announcement will be available at http://www.postfix.org/announcements/postfix-2.8.4.html]
Postfix stable release 2.8.4 is available. This contains fixes and workarounds that were already included with the Postfix 2.9 experimental release.
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 "sendmail -t" command reported "protocol error" instead of "file too large", "no space left on device" etc.
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.
You can find the updated Postfix source code at the mirrors listed at http://www.postfix.org/.