I'm pretty sure the a lot of these spammers are actually the same person. Since "nonferrousu" knows that his other user names have been blocked for previous spam, he probably is mocking us by adding "banned" as his user title.
But how would someone screen a new user? As I said in another message, I don't think the system will "hold" a message for review before it's posted publicly. (Maybe Rick can comment on this). If so, we don;t know it's a spammer until they post a message. I notify Rick of any "new member" origination with one of the IP addresses we've been having trouble with, and he has been deleting them. But by the time I get the notification message, the persona has already spammed the site.