Our main project management tool is Teamwork as you may know. Teamwork is a great tool with all kinds of advanced functionality. Alas often the basics don't work. In this case Message subscription management.
I've written to TeamworkPM about five or six times about their incompetent management of message subscriptions. In the bad old days (pre-thrashing by Foliovision), TeamworkPM tried to make everyone subscribe to every message. It was hell. Clients emailed our entire team (up to 35 people at a time) for the smallest issue. We couldn't get any work done.