Log in to your facebook account.
Click on Account (Top-Right)
(http://i571.photobucket.com/albums/ss157/fahamkabir/Online%20HOST/AccountSettings.jpg)
Then select Account Settings
Under my account select Notifications
Remove all tick mark (unmark all)
(http://i571.photobucket.com/albums/ss157/fahamkabir/Online%20HOST/Email.jpg)
Click on SAVE CHANGE (Bottom of the page)
From now you will get notification in your facebook account but no more notification via email. 8)