Sunrise,
Just wanted to say that I've emailed my T on several occasions but she never emails me back. For the most part this is OK, except for once when I emailed and where I included a request for an earlier appointment in the message. I thought she could have at least asked the secretary to call me and say there were no openings. Anyway, even though I don't get a response to my emails, I have found some benefit from sending an occasional "session overflow."

If he doesn't write back, don't assume its a negative thing. You and your T seem to have a good face-to-face relationship. Maybe he just wants to talk with you face-to-face.