If you are email-subscribed to a thread, you receive emails notifying you of new thread replies (provided you have notifications turned on). You can unsubscribe from, or mute, a thread two ways: on the thread page or by email.
- Navigate to the thread you want to mute.
- Click More under the thread text area (that is, not under any replies).
- Click Mute. You will no longer receive email notifications of replies to the thread. You can re-subscribe by clicking Reply notifications on under More.