Rainbow, your behavior is "learned" it has served you in the past to get you what you wanted/thought you wanted and there's no way to change that behavior but by working on it through practice and experiences. Maybe you do email too much now but look how you're really thinking about it and trying to understand another's boundaries (and, by default, learn where you want yours). Your T doesn't trust you "too much", that's like saying a parent trusts a toddler too much when it's learning to walk and falls down; the parent doesn't stop the toddler from trying again!

You have to learn to deal with your own triggers which is what you are doing; you have to decide what is a good idea for you to do, how to behave, your T can't do that for you.