What's Up, Comcast?

I have a Comcast e-mail account (colleenfischer at comcast dot net, if you're curious). I got it when I configured the Comcast broadband service on my computer. As far as I can remember, I haven't used it at all, save maybe e-mailing people I know a message or two when I first got it. Yet somehow I've managed to make it onto spammers' lists. I get spam on the account more frequently than I get Comcast service notices. Now how can this be?