Should you mention email to H? Very good question.
My instinct would be to save it for now (don't delete). Wait and see H's mood at dinner.
I wonder if he would be appreciative of her meddling or would it anger him....
I think at dinner, I would mention how nice it was to see them and see if I could rise a conversation about their visit with him. At some point, if you can get him talking you could casually mention the email. IDK, this is a tough one...
My motives and moves always were against rocking any boat with my H....FWIW
Sanderika
ME48/H48MLC T 33y M 28y S16 OW 8/7/05 Bomb 8/16/05 Sep 9/05 H f'd D 10/3/08 D pp'd 1/20/09,7/24/09,12/4/09 D dismissed 2/5/10 H served me D papers again 9/4/10 D dismissed 9/26/11