You could also create a new usergroup that is a copy of the Registered Users called Approved Users (also copy all forum permissions). Then, change the Registered Usergroup to be Moderated. You can set a promotion such that after a user has X posts, they get moved to the Approved Usergroup. Then, when the user signs up again, all his posts must be approved. This will get frustrating to him after a while since no one will see his posts. (You will probably also want to change the Registered usergroup to not be able to use the PM system.)
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