Only 1 person has asked but I wanted to post this so everyone knew how to do it if they wanted to.
Three simple steps:
Step 1) Go to this page: http://www.mugglespace.com/profiles/profile/emailSettings
Step 2) Check "None: I don't want to receive emails from TwiFans"
Step 3) Click "Clear My Follow List"
Step 3 is very important, and that's the one thing most members are not doing when they try to get rid of the extra e-mails. You must click the button in Step 3 every time you join a new group in order to prevent those e-mails from coming.
We hope this helps!