I email my T. Its a work email for her that is on her website. If I want to handle scheduling issues then I call. I mainly use email to let her know how I am doing and to send a session recap (how the session went). She has said she won't do therapy through email and she does take 2-3 days to respond. So there are rules. She replies to them but only a brief response and there is usually 2 days before I get a response.

I think email is great for getting something off your chest or if its easier to write something you are struggling with talking about. The down side is my T and I have had a few misunderstandings with email that is frustrating and would not have happened if it had been talked about in session. I prefer a phone call if I am really struggling. Its more comforting for me to hear her voice then to read words.