Good, but too wordy. Also there are too many explanations. When she chose to move out, that eliminated the need for providing her explanations. Polite, direct, no explanations needed.
"Will keep a lookout for the letter.
Son has your recent mail.
Please submit the mail forwarding paperwork.
Please send any future correspondence to my personal email.
Lastly, please let me know when the business regarding the joint and house accounts is settled.
Your name (no love, regards, cheers, hiya)
Far side Junky is 100% right.
If you want to save your marriage, you must speak less, listen more and be decisive. Women want leaders, not nice guys. If she loves you but is not in love with you, you need to transform yourself.
Don't ever tell you are swimming. Don't FACEBOOK blog about your lessons. Take a holiday to a lake with your kids. They will tell her that dad learned to swim. Keep your mouth shut.
Are you FB friends with your wife?
If so, unfriend and block her.
Your wife is very far gone. Don't hope a lot.
Even when the separation deal says no dating the opposite is common.
Kolors WAW was email EAing as they got ready to split. Once he moved out she banged more than one guy in short time. Now they are arguing about custody and alimony.