I'm not sure if it's feasable, and perhaps for privacy reasons not desirable (not to mention something being outside context since we can not, and should not, view PMs like threads).
However, if you are having issues with a user via PM please DO notify a moderator via PM with your problem. Abuse of the PM system is taken seriously and I have taken action against users who do so. Thanks!
"The devil I'll bring you," answered Hagen. "I have enough to carry with my shield and breastplate; my helm is bright, the sword is in my hand, therefore I bring you naught."