I use email the way tree does. My T lets me email as much as I want, though she trusts me not to overdo it. I usually write after every session because I feel the most stirred up then. She replies within a day or two in detail, usually.

She knows I have a need to connect with her in this way. It's a gift she's given me. Tonight I wrote her a long email about something I did today and my feelings about it. I use email instead of journaling. I am honest with my T during my sessions too, so it's not like I'm only writing and not talking. If I were doing that, I don't think it would be good for me.

Like Dr. Muffin said, you need to discuss the email "rules" with your T, even if it's hard for you to do. You could send an email saying "we need to talk about emails!"