I have been hit by a bunch of spam from sites that have the following text on the webpage:
“[some site name] is dedicated to bringing you the very best in exclusive offers and deals designed for your needs. Please go to our subscribe page to register with us. If at any time you wish to discontinue receiving offers, you can unsubscribe using this page . ”
Dumping that into google, I see about 871 (as of May 5 2007) sites with that text in it. I will be adding these domains into /etc/mail/access to deny them completely.