The old mailing list at the Universität zu Köln will be decommissioned soon. We will announce, when we will make another available.
Sourceforge also provides Bug trackers, where you can enter bug reports, feature request etc. http://sourceforge.net/tracker/?group_id=49418
There are Forums available at http://sourceforge.net/forum/?group_id=49418 for Developers, Help and Open Discussions.