Sounds like B/S to me. The fact that he won't always be there has nothing to do with whether he responds to your emails or not in the present time. If he does't want emails and won't respond to them, let him say so. If he does, and that's an acceptable way for you to communicate with him, let him say so. Sounds like a bunch of blowing smoke, to me. If you feel the need to email him, I'm sure you have a good reason. And I'm sure you're paying him well for his services, whatever they are.