If you only email a lot when you're manic or hypomanic, I would try and set a limit on the emailing, but that's just me. I know I have to restrain myself from calling people and texting people because I can be a bit much.

If you're close enough, you can always ask him? I have a friend who knows about my bp and I've asked her if I talk to her too much, and she has said no. I trust her to tell me if it becomes a problem.