His position (which is explained on his webpage: http://www-cs-faculty.stanford.edu/~uno/email.html) is a little more nuanced. Relevant section:

> Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration.

I think he would agree that a President's role is to be 'on top of things'.