I will just kill the email address. Due to the tracking on internet I am using a customized email address for each site where I register to (for example sha1(news.ycombinator.com-secret)@mydomain.com) while my personal address is never used on any website so my antispam quest is quite simple :) You send spam, you are redirected to /dev/null

As a side effect, I know when my address is sold to anyone and by which site, I am already sharpening my papers, after 25. of May, every website that will give away my address is going to get serious papercut.