Is emailing a property manager's nasty emails to his clients considered tortious interference with advantageous business relationship? I don't think so even tho his attorney is arguing it is. After all, what's in his email and mine are all true. Thanks.
In short, yes it can be. There are only very limited times you can do this without being liable, and it will cost you more to defend yourself than to not do it.
Lawsuit / Dispute Attorney
What you are talking about is raising a defense to the property managers claim which, regardless of whether or not its allowed, will be your burden to prove should this end up in court. A better course of action might be de-fuse the situation and simply try to resolve it out of court.