Hi mum!
Can't give very good advice on this I'm afraid, but a few thoughts anyway! Since he didn't do what you asked him to in your mail, is it possible that she didn't tell him? Could she be trying to interfere in the court procedings this way, to get you out of the picture or because she doesn't want him to have any contact with you? Anyway, I think that it would probably be good if you could prove that he didn't read the e-mail in court, even if she is naturally supposed to be involved in the family, impersonating someone else is very serious stuff indeed from what I hear, and it wont just be your husband looked into, but the whole "home-situation". Wow, I'm using some strange words today, I think I need to wake up a bit. Congrats on your fiance, he sounds like a great guy, and you deserve nothing less than the best!