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How do I stop my vBulletin forum from having unregistered guests spamming it?

It seems my vbulletin forum is still having problems with unregistered guests spamming threads and members Inbox on the forum. Do you have a solution for this?
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1answer
205 views

vBulletin 3 spam solutions

We use vBulletin 3 for our forums, with a ReCaptcha, a simple "To verify you're a real person, what is the FIRST letter of the English alphabet?" question on signup, and a verified email address ...