I recently requested creation of a driver-c-debian@mongodb.com Google Group, which can replace the existing mongo-c-driver-debian@googlegroups.com. This will ensure the group's access is managed within our existing IT infrastructure.
References to mongo-c-driver-debian@googlegroups.com will need to be updated, but we should also leave that group in place for some time (at least a year). This ticket can remain in place as a reminder to do so when the time comes.