[V1ceC1ty]

StopForumSpam as mentioned above twice. It's the best thing you can do. I've used it for over a year now and it's blocked thousands and thousands of bots. Occasionally one or two may still get though but if you're quick you can just delete/ban the user.

From my forum which has only been registered for a few months now and it's not all that popular.

Quote:

3071 Spammers blocked up until today

I use SMF's version of StopForumSpam and I can safely have registrations without captcha or questions as it can put some normal members off registering, especially if they can't answer the question for whatever reason. I do however make them activate via their email because 99% of the time they register with "34rdfgbnbgt4@gmail.com" and it's not a real email.