Let her be as angry as she wants. Show her you can "handle" her emotions. You stay calm and listen. Switch your thought process from arguing or justifying to She wants to be heard and understood.
Yes, if you can adopt this when you’d naturally avoid, communication will doubtless improve between you and your STBXW.
Originally Posted by tt180
continues to attempt to break boundaries (talking about finances in person instead of email)
The cool thing about boundaries—boundaries only control you—is nobody can break them but you. If your boundary is, “All my communication to her about the divorce will be by email” she’s free to message you any way she wants—text, voicemail, email, in-person—and none of it prevents you from sticking to your boundary to only communicate to her about it via email.