Yep. I would do it. I have done it. I've done it with feelings about her, issues I have currently, and disclosing things about my past. I'm not supposed to write emails like that anymore unless I absolutely have to. But even then, I'm required to bring it up in therapy if I want to discuss it. That's because of where I'm at in therapy though. My treatment right now is being open and verbalizing what I'm dealing with. For you though, I would take tge opportunity if it will help you. It did help me.