I have, very recently. When I finished therapy, my T asked me to let him know how I was doing after 6 months or so.

I emailed him last week. I thought about calling, because it would be nice to hear his voice and speak to him, but I can express myself better in writing. And I wanted to make sure to tell everything I needed him to know.

Even though I didn't write much details, it was a long email. I told him I was doing well, that I'm still making progress and learning new things. I also wrote how I struggled the first months after saying goodbye and how I missed him (and that I still do sometimes).

I asked for a reply and I got it the next day already. He wrote that he was impressed with all the progress I made and how I handled the grieving process. He also said he was proud and that he'd always thought highly of me. It was a very sweet email and I was happy to receive it. I got emotional about it too. I'm not that attached anymore, I've almost let him go, but sometimes it still hits me. It threw me off balance for a couple of days.