Here's how to edit your group settings to stop receiving group digests:
1. Click on "My Other Stuff" at the top of the page in gray.
2. Click on "My Account Settings".
3. Select the Email Preferences" tab.
4. Scroll down to Group Digests.
5. You can select to turn on or off the Group digests you receive for group "replies to your posts" or "new announcements".