n, Find a way to block the emails from that email address or better yet, change your email address. When you see postings from them, just delete them. She's a vindictive lady out for some fun at your expense. You know what she's like, so do not allow her to bring you down. By getting upset....you are allowing her to win.
Also, maybe it's time you spoke to your friends and asked them not to share so much information as to what is going on in your xh's life right now. You need time to heel and even though they are saying that they aren't having much contact, if any with them, they certainly appear to know quite a bit of what is going on.
N, you have to make the deicision as to whether or not you want to to move ahead and not have comments or emails such as you received bring you down. Take one huge step and block the emails. You have to find a way to move ahead and heal from this mess.
Please take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.