Double post there, The Architest.
I concur on this matter. If PM is to act like e-mail, you should at least be able to block them. It would also be helpful if you could mark a certain PM as spam which would alert the admins to deleting the PM and putting a warning on the user (provided the admins agree that it was a spam PM).
Also, if this option were to be put in, a minor oversight to avoid would be unblocking the users' PM's.
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