There are many things to do
- Image verification and email confirmation will stop the vast majority of automated registrations and bot postings.
- Swear filters are good if the same offenders keep coming back - filter URLs, site names, etc.
- IP blocking is worth a try, but a serious spammer will get around that.
- tighten up your flood control settings to limit the number of messages a bot can post.
- if you haven't done so, be sure you have a "report" link in each message or thread so members can let mods/admins know when they spot spam
- use mass pruning/deletion for quick cleanup.
- check the IPs used to post, and document the spam to the ISP or institution if you see any kind of pattern.
- if your problem is really massive, you could even implement image verification on each new post; this will irritate the membership, though.
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