Sounds like he is trying to pick a fight by doing those things. Just ignore his words and actions. Sounds like you need to detach more. I know I am not one to talk about detaching!
Avanti and BT, I don't think H is trying to pick a fight. I suspect when OW pushes I get emails accusing me of dragging my feet, the marriage is truly over etc. Then nothing more is said or done. I just got aggravated that he can't take care of something as small as his mail.
I'm usually pretty detached. I haven't pushed about the mail, or him getting his stuff out of the house etc. which is a big 180 for me.
I was a little surprised my L sent the email but I'm ok with it. It may help show H I'm moving on.
Me53 H48 M 13 No children together BDMay '15 PA June '15 H moves out,files 8/15 wants "quick divorce" but does nothing Me sending proposal 12/15, court dates upcoming
