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

Don't let anybody post until they respond to an email sent to their registered email address. You'll see lots of forums and mailing lists generate a unique email address or web url that is sent to the new user's given email address, and they have to respond to the email or click on the link to finalize their registration.