Oh my GOD. What a dick! Yes, I think it is time to have someone screen your emails from him, just saving them into a "Crazy A$$hole Ranting" folder or something and passing along anything that you need to know to you separately. You will probably need these emails as ammo in the future, but you shouldn't have to subject yourself to that. How awful. I'm so sorry.
You are doing great BTW - I admire your courage in standing up to him.