Ummm... use an email account that you don't give a crap about

How did they get your number? I don't remember the sign up page asking for a number, and if it does why would you put your real number in? I don't even use my real name. Might want to chock it up as coincidence, maybe they finally got to your number in the phone book with their automated systems.
I've been doing these free mag subs for a few years now. Hell, my Maxim sub doesn't expire until 2013, and the sub started in 2005 at least. Free toilet reading for some spam is worth it to me.