Very well said by David Allen in his latest newsletter:
Processing your inbox is your work. It’s not something extra you have to do, or some distraction that doesn’t belong in your life…unless of course you feel the same way about your physical mailbox. Like it or not, dealing with all your email is as much a part of your work (and required to do your job as well as you can) as keeping lists, clearing your head, or doing regular reviews. Yet consistently, we come across a resistance people have to driving their inboxes down to zero on a regular basis—as if that’s a luxury reserved for those who don’t get much input or don’t have anything better to do. It’s a critical component for keeping you in a clear, current and creative space to work and play at your best.