It’s easy to feel overwhelmed with the crush of email. In fact, one study showed the average professional spends 4.1 hours per day responding to work messages. During a recent time tracking exercise, I discovered I’m actually at the low end of the spectrum, spending about 1.35 hours per day on email. But psychologically, it carried a disproportionate weight: regardless of how much time I spent, it seemed like I was always stressed about the unanswered messages in my inbox.