At first, my T was fine with text and email for scheduling, and I could email her - but her boundary was not to respond. I have been seeing her for about a year now and as she has learned more about me and about my situation and needs, we have agreed on "check-in" emails between sessions such as I might say "Just touching base" and she might write back "I'm here." and that's it. No counseling over email at all, because she feels that goes against her ethical boundaries. I can call her when I need to and she will call me back, but I haven't needed to use that method of contact yet. I also see her weekly, so I don't usually have too long of a stretch between appointments. It's a hard conversation, but I would just bring up the subject in some way and see what your T says.