I e-mail my therapist when i need to vent and stay connected. I tell her not to respond and that we can discuss it next session. If it's not a true emergency or crisis situation I never look or wait for a response. It's really hard though, especially when therapy is good and you have an awesome therapist. (just can't get enough of them). I agree with Jane and Lickety. Go ahead and send the e-mail but don't get all worked up if she doesn't respond. Try to discuss it next session or if you just really need to communicate with her ask her if shes open to check-ins via e-mail or phone. I hope everything works out for you.