Ah okay, sorry I didn’t pick that up that the letter had gone.
The thing is you would only have evidence to collect if he provides it by his behaviour. So he is in charge of that stopping, really.
His emails are designed to muddy the waters, and create a narrative which suggests everything is fine, even if it is not. You can respond politely by saying thank you that he has shared his perspective, but he might like to know that DD has expressed some discomfort to you about his behaviour in particular when he was making undue noises. As you both want to ensure she does cope with the separation, please can he take care not to do this again?
Or you can let it go, and collude in his fiction that everything is fine, even though you know he is continuing to behave appallingly and in a way she is picking up on.
It’s the same dilemma as previously, really, he behaves abusively and you tip toe around him not to rock the boat (and because you feel guilty and he trades on that as well). There might be some sense in not rocking the boat because you are focused on getting out safely, but what you are learning is that this man lies - he lies bare-faced to you by constructing a narrative you know not to be true.
The third option is to sit on it and see what happens, if he does it again, speak at that point saying you were willing to let it go as your solicitor had already contacted him, but as he is not paying attention, you need to let him know that DD was upset by his behaviour.