It seems as if someone signed you up at the "fill this form out and get money" site, and entered your e-mail. Thats what I did with my AOL account.. Haven't checked it in a while
LOL Everyone knows there is no such protection. You shouldn't use you'r email to sign up for things half the sites get your email and pass it on to their sponsors ect...
tbh all the emails i get tend to go in the spam folder unless there off my myspace account [before i deleted it]