Customize the notifications for the forum categories you want to receive, and not receive, new topic notifications from. Login and go to a category's front page(it will show topics list) in the forum and look for subscribe/unsubscribe button. You can leave it, or change it, or change it back at anytime for whichever group you want.

Screenshot example - Button will say unsubscribe or subscribe for the action you want after click.





If you need any help - This email address is being protected from spambots. You need JavaScript enabled to view it.