Recently active topics in Metroblogging tagged with email

When posting a comment there was a box to check titled "Notify me of followup comments via e-mail". Even though I did not check that box, I still received an email notification with a followup comment. It appears that the author looked up my email from my registration information and then cut and pasted his comment from the thread into an email and manually sent it to me.

Is there a way to not receive followup comment emails other then just changing my profile email to something fake?