Across the planet, over 300 billion emails are sent every day. That's over 2.8 million emails every second, and 90 trillion over the course of a year. No wonder the U.S. Postal Service can't keep up with the competition.
And neither can we. Corporate workers send and receive an average of 225 messages per day. If we gave each email coming through our inbox our full attention, we'd be hard-pressed to get any other work done.