Every day, my in box seldom has more that a dozen emails in it. Most of those are shipping or billing notices. Eventually all emails are either archived or deleted. I archive a lot of stuff, storage is cheap and there's been a couple of occasions where I needed to lay hands on a email from year or more ago. My archive folder is unstructured, the search function is very good at quickly finding the stuff I'm looking for. I clean out the spam/junk folder every couple of months.