"As you simplify your life, the laws of the universe will be simpler..."
Henry David Thoreau
Can't really do much about the email I receive (apart from keeping my emails off sites so those evil spambots don't get hold of it) but I can control the stuff I save.
My sent items was overflowing with very old correspondence and was brimming at about the four and half thousand mark.
On trains, planes and during some down time that number has been whittled down by over three quarters (it's an ongoing process still).
I've also started using a much better 'filing' system through the use of dated folders and more importantly a kick-ass CRM tool called Highrise (which basically orders and assigns all my email to the individuals and contacts involved in the communication, hosting it all in the cloud and off my machine).
How do you ensure there is clutter in your inbox/email system?