When I typed this question into my search engine (guess which one), this was the top response I got. It's a two year old article from a web-hosting site. Here's the third listed article, which has information down at the bottom of the page.
I know it's difficult if not impossible to catch spammers, but as we'll all probably gotten spams recently dealing with the I.R.S. (at least I have), you'd think the Feds would be a bit more on the ball. And if the FDA controls dispensing of prescription medications, you'd think they'd be more interested in the dozens of 'enticing offers' I get for illegal meds every day.
The netidentity site directs you to the Federal Trade Commission site anti-spam site, which encourages you to forward your spam to them. Let's send them all our V&agrA spam and see what happens.