Would it be possible to put something like DSPAM or Spamassasin in-line on the forum, to evaluate the posts? My local DSPAM catches about 90% of the spam from the forum with very few false positives. Just quarantining the messages identified as spam and requiring them to be moderated would not be a large number of messages and would remove much of the spam. Also, I see a lot of "probe" posts - posts that are an attempt to see if posting is possible and to build a post count before the spam run; posts like "your blog is very informative and I have bookmarked it" or "very useful information, thanks". Were there a way to flag such users as potential future spammers we might be able to prevent the spam run from ever happening.
