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I use Askimet and it catches most of everything. I'm also put some words on the 'Automatically moderate me' list based on things that were getting through that were still spam.
I have that math plugin, but got rid of it. I think it causes too many problems for people who leave legit comments.
I'm a bit confused as to why you don't want user to signup just to post a comment. Why else would they sign up?
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