You might need to declare email bankruptcy.
This applies to Inbox Zero, of course. I'm not there, but I've been improving.
Of course, as I always say, the problem with answering email is: it begets more email.
Fewer emails need to be sent, forwarded, and CC-ed. (I am a culprit here.)
Free yourself by answering emails more briefly, if you can (though I find terse emails can often induce miscommunication and/or bitterness).
More emails need to be simply deleted. More need to be never read. More need to be unsubscribed (along with feeds, if you're addicted that way, too).
Most of us need to find ways to pare down what we do, to de-clutter literally and figuratively.
I've said it before, I'll say it again: I just want to Get (a few) Thing Done. I'm not looking to be a world-beater. And I'd say, though improvement is possible, of course, that I'm doing pretty well these days. I'm happy about it.