A lot of Ts don't like email for other reasons besides security. They don't like that it can become an extention of therapy, that the written word can easily be misunderstood because of lack of verbal and/or facial expressions, and in times of crisis they might not be able to react soon enough or appropriately to help their clients in that situation. Actually, many don't want to be a part of the crisis plan at all. So while emails can be a security risk, it can also be an emotional risk fir the client as well. And in those situations, the client isn't in the right frame of mind to assess the risks.