I'll leave this up, for the sake of FP's comments (although I've disabled the hillock-rhymer's account). I googled as suggested and there is some interesting stuff.
An obvious way to restrict the spammers is to make it harder to register with the forum, but I'd rather we didn't go that route as that might deter people who have a real problem and won't be in the mood for extra security procedures, whatever that might mean.
The main effect of security procedures in most online access is to annoy and frustrate legitimate users, with very little effect on fraudsters who continue to flourish.
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