Stopping Emails from ASC - The short version, try first
IGNORE THIS TIP. THE NEW ASC SOFTWARE HANDLES EMAIL NOTIFICATIONS IN A TOTALY DIFFERENT WAY>
Before going through all the steps in Stopping emails from ASC try the steps shown below.
Go to your profile and select Manage Email Notifications - (NOT Email Notification Preferences, different beasts).
This will list all your current notifications. Select the one or ones you want to stop by clicking in the box.
Finally scroll to the bottom of the page and clcik Remove selected notifications.
If this fails to stop the email then do the full procedure listed in Stopping emails from ASC