I have tried everything possible to stop email notifications in the Premiere Elements forum to no avail. I have selected "Stop email Notifications" and then checked completely out of Adobe Community, re-entered, selected "Stop email Notifications" several times. I have also gone into "Your Stuff" and selected stopping notifications there. Nothing helps.
This account does not have any email notification subscriptions. If you are still getting email from the forums, is it possible that you have more than one forum account and the mail is going to a different account?