LT - it's not your job to worry about the boundaries anyway. Email away...seriously. It's not some sign of health or strength to not email your therapist - especially when he hasn't told you to stop. Hell, my therapist actively discourages me from holding back on emailing, and I promise you that I email far more often than you do. I'm not unhealthily emotionally dependent on my T. I do NEED him. (GASP! Oh my! I have needs?! What an unhealthy person I am! /sarcasm)

In any case, you're not in therapy to work on being more closed off/disconnected/need people less (at least as far as I can tell). So, why exactly would one put effort into not reaching out to a T who has clearly said "email is OK!" ?? To prove what exactly?? That you don't need them? Bully for you and your not having needs then.