I wrote recently about the futility of trying to reach inbox zero. Since email expands to fill the available space, the best approach is to plan in important things first--creative work, mentoring, dreaming--and then let email fill in around the edges.
But even if you agree with that philosophy, there are practical considerations. What if most during-the-day communication in your office occurs via email? And what if responding to emails actually is a big part of your job? Are there smart ways to check email in those cases?