[ghaff]

One thing I do is that if something comes in that I think I might want to refer to at some point, I'll give it an &archive label. (I used to have a more elaborate set of labels but these days I mostly just throw most things in one place and rely on search for the rest). And then just periodically delete older stuff that hasn't been files--especially if it's unread. I might take some time to skim things to see if there's anything I want to save.