My shrink accepts emails and does read them but doesn't do emails himself. So I tend to not use email as a means of communication very often. It is not necessarily a boundary thing. I think it is the amount of time he has. With so many patients if he had to respond to everyone he would be working double time nearly.

That is just my situation. But I mention it because there is a slight chance that even if your therapist accepts emails she might not respond in email form and wait till she sees you instead. Just so you are prepared in case you don't get a response right away. That to me would be frustrating.