How do I protect my forum against spam?

Question

I have a forum on a website I master, which gets a daily dose of pron spam. Currently I delete the spam and block the IP. But this does not work very well. The list of block

Answer 1

Advanced solutions:

• Akismet
• Defensio
• Sblam! (open source clone of the above)

You can try your luck with non-standard form:

• fields that must stay empty hidden with CSS
• fields with misleading names, e.g. for something that is not an e-mail.

For me CAPTCHA is like giving up to spammers and letting them damage your forum anyway – except that instead of spam damage, you get usability and accessibility damage.