I would personally recommend, if you haven't one or more of these suggestions:
1. Make a new usergroup for new members where until 5 posts, they can't do things like post links, and their posts go into moderation and have to approved by a member of staff.
2. Increase the difficulty of the question and answer mod. Aka, something topic related, NOT something like '1 + 1 = ?'
3. Email verification. Maybe with the those things above.
With this stuff, I've never really gotten any spambots.
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