We have stopped 100% here by using these free tools:
- Spambot Stopper (times how long they take in reg screen)
- Q&A a random question and answer from a pool of 5
- Spam-O-Matic
They get executed in the order above. If its a bot (fast, spambot stopper does the job, by counting number of seconds it takes them to fill out the registration screen), if its slow, and can answer the random question, the IP and EMAIL addresses are checked by Spam-o-matic by the blacklist database at
www.stopforumspam.com (Just make sure you have the NICKNAME CHECKING turned off in that app, or it will get a lot of false positives)
If they pass all 3, then they are allowed to create a new account on the forum.
Mike
PS: We also use vb bad behavior