The GNU Gatekeeper mailinglist is moving to a new hosting service and you have to re-subscribe to remain on the list and stay informed!
The list has rather litle volume, but you will get announcements of new versions and have a chance to ask question to the community.
Please (re-)subscribe at https://lists.gnugk.org/cgi-bin/mailman/listinfo/gnugk-users
If you have been on the old mailinglist, you may also have to update your email filtering rules since the name is changing from "openh323gk-users" to "gnugk-users" (finally!).
Sadly SourceForge is blocking my access to subscriber emails so I can not make this move automatic for existing subscribers. Sorry for the inconvenience!