Spambots

[Mockery]

Anybody know how / where in the vBulletin admin you can change what user group is the default one that users are assigned to after they have verified their accounts? If it's possible, I want to set up the forum so all new users have to send me (or any admin) a PM once their accounts have been approved to enable their posting access. Until then, their accounts would be registered, but they wouldn't be able to make a post until they send us a PM to prove that they're actually human instead of a spambot.

I just went through the Usergroup Manager, but couldn't find anything about how you can set a new group to be the default group that newly registered users (with confirmed email addresses) are placed into.