Rob - as spammers gets more anti-spam hurdles, they increase their odds by including stuff that you are likely to want to read. The get a lot of this info from those e-mails that are sent to a bazillion addresses. They even go so far as to fake sending an e-mail from other well known domains. I did a website last year for a friend and every now and them I get e-mails from soandso@ his domain name even though I KNOW they are not coming from that server...
It's real easy too - I can send you an e-mail as
god@fish.com if I wanted to...