During the first couple years of my wife's and my marriage, she was not very capable of talking about problems in our marriage. This stemmed from the fact that, when she was growing up, her stepmother would often be controlling and abusive when my wife did choose to speak. I mentioned to her that, if she couldn't speak, perhaps she could write down her thoughts. This helped my wife immensely, and she was able to articulate her feelings without fear of being interrupted or put down because of them, and it also created some wonderful lifelong gems out of the notes she wrote.
Email may not be your preferred way of communicating, but be thankful he IS communicating. As long as that happens, every relationship is fixable.