I don't understand the new email settings dialog:

http://www.picpaste.com/serverfault-X4C7RY1s.png

Very confused whether that sends me emails every three hours (as per the drop down) or not at all (as per the checkbox). I'm unable to uncheck the box.

I don't understand the new email settings dialog:

Very confused whether that sends me emails every three hours (as per the drop down) or not at all (as per the checkbox). I'm unable to uncheck the box.