Heh, my friend got banned for replying to her because of unintelligent banning; I imagine that issue has been fixed now.
Interestingly enough, the Suliat Mabou scam is one that penetrates the entire internet, not just RHP. Google it and you can see; originally, it's one of those bank scams where they take all your account information to wire money into it and save it from the Senegal government. No idea what they expect to find on RHP except suckers.
Anyway, a 'report' button would be good; it would be an obvious way for spam-victims to solve the problem. Not allowing anyone to send a PM without a move number of '1' would be nice; if this site works like other sites I've administrated, you could automatically assign a title as soon as someone reaches '1' move and that title allows PM's to be sent.
I'm assuming, since Suliat Mabou seems to be a pretty widespread scandal, that the perpetrator has an IP scrambler. If not, you can ban the IP of the computer doing this. You can also ban the e-mail accounts instead of the user. Though, I'm sure you guys have figured that out since 2002, but I went through a lot of headaches trying to battle spam. Had a spammer so bad once that the moderators had to take shifts over the weekend where they promised to be online to delete the massive amounts of threads!