1. Control Panel > Members (Member Search)
2. Search for the user by entering the bounced email address in the "Real Email Address" box.
3. There should only be one user result returned. Click the user name to edit that user.
4. Now go to the "Preferences" tab, and update the "Email and Private Message Preferences" items you want to disable for that bad email address.
Click "Update Member," and you're done.
