Another thing you can do is:
In a post that you posted in, click on the link under your name that says 'Member', 'New Member', etc. That will bring you to your forum profile page.
Once there, under your avatar you will see where it says "You may edit this information."
Click that link.
Once there, scroll down and un-check the box that says "Favorite Notification".
That should turn off the e-mail notifications for new posts in the forums.