[Suki]

IP-band sounds like the most efficient solution but some forums don't have that option (not sure that's the case with JF). If all users had to wait 24 hours before being able to make their first post, most spammers wouldn't think it's worth the time and would just go away, I think Kajitsu's is a good idea.

[Kanji is not on msn at the moment and neither is CoolNard, so it might be a while before the user + all of his posts are deleted].