I've been fighting spammers as a forum administrator myself, using the phpBB platform, and I've found that there are two ways to win:
1. Approve all new members manually (lots of work), and
2. Add a question-and-answer to the registration screen (not much work). New members have to answer correctly in order to be approved. The question can be very easy (e.g. yellow liquid, three letters? answer: pee), but since it requires actual thinking the spambots can't crack it. Eventually a real live spammer may crack it manually and give the answer to the bots, at which point you can change the question.
Unfortunately it seems that the spambots have figured out e-mail authentication, so forcing users to provide a valid address doesn't help much.
You could also try implementing a more complex Captcha that is more difficult for spammers, but that comes at the cost of making it harder for people to interpret.
1. Approve all new members manually (lots of work), and
2. Add a question-and-answer to the registration screen (not much work). New members have to answer correctly in order to be approved. The question can be very easy (e.g. yellow liquid, three letters? answer: pee), but since it requires actual thinking the spambots can't crack it. Eventually a real live spammer may crack it manually and give the answer to the bots, at which point you can change the question.
Unfortunately it seems that the spambots have figured out e-mail authentication, so forcing users to provide a valid address doesn't help much.
You could also try implementing a more complex Captcha that is more difficult for spammers, but that comes at the cost of making it harder for people to interpret.
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