When editing your subscriptions you will want to go to settings:

Then you go to Subscriptions:

This is where you can uncheck the ones that you don't want emails for or if you don't want a system message in your DN inbox.
**They will not auto check if you have the same settings as listed in notifications.

Then click on Update Subscriptions. 

** Just remember if you start a new thread or topic in a forum, it will automatically *no matter what* subscribe you unless you UNcheck the boxes in the forum when posting**