How can I stop the follower spam?

Readernaut needs to stop sending me an email every time someone "follows" me. I can't figure out how to disable it, and I *hate* being unable to do anything about random strangers just adding me. Other sites let me configure this (both when I should get emails, and whether someone is allowed to add me). In my desperation, I even looked for a "delete my account" option, but couldn't find that, either. I just want the emails to stop. :-(