Clearing your inbox feels productive. There's an instant gratification. But just like in Tetris, no matter how good you are, more emails will keep coming, and faster.
Today an average professional gets 110 emails/day (not spam - real emails). By 2015 it will be 125/day. Since days in 2015 will still only be 24 hours long, something has to change - you.
You need to change the way you think about email, and the way you process it. Let this sink in! Then move on to Commandment #2.