That's because you have your personal options set to subscribe to every thread you post to, and then send you an email each time someone else posts to that thread.
On top of that, AOL is your email provider. They've got lots of problems with their spam filter settings, and they were blocking all emails from the DISboards for a while. Last week, they corrected this so you started to receive the emails you were actually supposed to get from here.
If you want to change your settings so you don't get notification emails, head to the Tech Support forum and check the Frequently Asked Questions post for instructions on how to change that.