you're having trouble with spam. I'm tempted to collect these people's e-mail address and pass them on to a friend of mine who works in the software department of a "significant" electronics manufacturer. He can flood an address with over 6,000 e-mails per hour, which is usually enough to get the recipient banned.
We broke an e-bay scam that way a couple of weeks ago.
The forum for our hot rod club has no such problem, because you have to register, then receive an e-mail, and then every post has the web address recorded.