Don't know what that's all about. @snr (userID 3872) is a member of !selfhost (groupID 164), !lazyweb (groupID 506), !ownCloud (groupID 549) and !grap (groupID 750). So subscriptions have worked in the past. Right now you're not a member of !googlefree (groupID 493). Maybe try again? If it won't work then I don't really know what knobs to twist to make it work...