How to prevent spam in vbulletin?

[prakash123]

Daily I get 10 spam registrations in my forum. I have to manually ban the email domains.

Is there a better way to do that?

Should we change our captcha to a better one? If so, how do we do it?

Thanks

[Zachery]

It would be in your best intrests to upgrade to 3.6/3.7 and use the more robust offerings on human verification.