Rock I don't necessarily agree with the board with complete no contact.
No contact is not your goal. Limiting your interactions is. Communication is important, but is does not ,should not, be in person. Email gives you time to process and respond...as well as gives you a document trail you can refer to in the future.
She is a master manipulator and you fall into her spell.
This is how you should respond:
W:"I can't communicate with you this way" H:"That must be hard for you."
or
W:"I can't communicate with you this way" H:"I understand you feel that way."
etc.
If you want to be edgy and stir some emotions:
W:"I can't communicate with you this way" H:"I have noticed."
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712
