FWIW, I wouldn't send an email. You've told him to go through the lawyers, so whenever he tries to sneak in a comment about the divorce, either put the phone down, or just say, "speak to your lawyer." Sending an email may appear weak, because he's getting you to communicate about the divorce, even if only to explain.
Just a thought.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim