I've never written a therapist an exit letter. I wanted to write a long--gone therapist a letter as to how the termination affected me, but my current ex therapist was concerned that it would have more of a negative effect on me if I wrote it at that particular time. Her question to me was was I going to be okay with whatever response I received? That included no response. I agreed I was not ready at that time and as I progressed in therapy I no longer had the desire to waste time on someone that didn't get it then and may not get it now. I also had no constrictions on how much I could rant about her and no limits on emails to my then, now ex therapist which helped a lot.