Spammers have been documented as stealing other site's domain names via forgery - both Reply. Net and Concentric Networks have been hit this way. Indeed, Outernet, Inc. was actually attacked by one such spammer. The spammers have a new trick - they supply an offshore phone number that you are supposed to call to be removed. Report it to your nearest anti-spammer and the National Fraud Information Center .
Spammers lie to their customers.
For example, Quantum Communications claimed to Mass Music, an innocent customer that they'd send a mailing to people who'd asked to receive info about new products and services, not to thousands of unwilling spam recipients. Now Mass Music's made thousands of new enemies who will never buy from them after to being spammed, due to Quantum's misrepresentations. Another, similar, lie is to sell someone a mailing list and tell them that the people on it want advertising e-mail. Most of the time, the list is one of the same old spam lists that's been around five years. There are a very few lists of people who've signed up for ads, but they're small, targetted, anot not cheap.