Hi Dien,
The good thing about vbulletin is you don't have to come up with your own hack.
Here is one mod that should stop the spam - and shouldn't take more than a few minutes to set up:
It prevents members from private messaging or adding links / emails to posts before they make x number of posts:
http://www.vbulletin.org/forum/showthread.php?t=123002
You could also do this to prevent private message spam:
Quote:
Copy the default "Registered Users" usergroup into another group (say "Fully Registered").
Now set the "Maximum Recipients to Send PMs at a time" permission on the Registered Users group to zero to disable sending PMs.
Add a promotion to upgrade users from Registered to Fully Registered at X number of posts.
You may also want to rename "Registered" to "Newly Registered" or so.
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Other mods you may want to look into:
http://www.vbulletin.org/forum/showthread.php?t=118421
(to prevent posting spam.)