I call it an addiction, because it gives us the hit of feeling like we’re accomplishing something when we’re actually being distracted from the most important things we do that bring value to the company. Not sure I agree with Jim Schleckser on the “Do Nothing” suggestion, but you should certainly set up rules for your in-box. My favourite one is “If I’m not on the To: list, file it. ” Saves a lot of time not reading CYA (Cover Your Ass) emails.
One tactic I’d add would be to turn off your notifications and chimes that tell you when a new email has arrived. That really is an interruption that will destroy your productivity faster than just about anything else.