I agree about with just not signing on, although Oldrooster brings up a valid point.
Oh, and If you want to stop getting notifications to your email, since you'll no longer be logging on the site, Here's what to do:
Click on "subscriptions" up at the top, by your user name, then "Edit My Subscriptions". Scroll to the bottom, to where it says "Select", click on "ALL", then right next to that, where it says "with selected" choose either Delete or Set to Site Only (since you wont be logging on, it wont matter if you select this option)