Indeed, first follow what "Agitated" stated above. We then use two usergroups for users who have already been verified by return e-mail:
1) Registered Users - Moderated
2) Registered Users - Unmoderated
All users in the first category have ALL of their messages moderated by someone until its decided they are not spammers and then they are moved into the 2nd category where they are no longer moderated.
Most spammers "hit and run." After the first post you no longer see them. They won't sit there waiting for you to approve their first and likely only post. After all, most are automated bots.
On top of the above, you can run a mod like CHECK4SPAM available on vbulletin.org that will prevent new users from posting messages containing e-mail addresses or URLs anyway. -- Rik
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