I don't know that I agree with what others say about no contact- when I had a restraining order against my STBXH my dad blocked all of his emails. My mom didn't, and he sent her some crazy rants. But he hated my dad with a passion- I'm sure those emails would have proven really valuable in court (had I not been so idiotic as to drop my restraining order and come back for more abuse following his empty promises).
Definitely- do not engage!
Best wishes