Someone has been sending me rather rude PM's lately. Is there a possibility I can warn that person, the way you do by clicking the sign on normal posts?
Alchemist, he's not whining, he's asking a question.
Anyways, just do what Gohan said, forward it to a mod. Just the most current PM. We'll then PM the person PMing you and ask them to stop. If they continue then we'll disable their PMs or something.