Last modified: 2014-08-18 18:47:23 UTC
Currently mailman used on list.wikimedia.org is version 2.1.13 which was released december 2009; The latest release is 2.1.15 which was released June 2012.
Do you have a link to release notes?
There are some tickets in RT for this too, RT #2905 for upgrading mailman in general, and RT #5420 for upgrading sodium (the Mailman server) from lucid to precise. We also asked Debian about this: http://web.archiveorange.com/archive/v/z0lS8b9RktED1z9MF2gR Mailman change logs are at https://launchpad.net/mailman/2.1/2.1.14 and https://launchpad.net/mailman/2.1/2.1.15
Release note: http://mail.python.org/pipermail/mailman-announce/2012-June/000174.html
Upgrading to 12.04 does seem a sensible starting point
Info from the RT ticket: Debian wheezy/sid: 1:2.1.15-1 Ubuntu lucid: 1:2.1.13-1ubuntu0.2 Ubuntu precise: 1:2.1.14-3 "Debian's upcoming stable release, 'wheezy', currently frozen in preparation for the release, features 2.1.15 packages. Because it's frozen, installing wheezy at this point should not give you big disruptions, but of course it also hasn't been officially declared 'stable' yet. An alternative is to build a port of the 2.1.15 packages yourself. You can get the source package through http://packages.debian.org/mailman and rebuild them in a precise environment."
