I don’t know how you use your email inbox, but here’s how I use mine. Nothing gets filed until I have responded to or acted on the message in some way. Then, it’s placed into a folder where I know I can refer back to the note later. Usually, I try to keep my inbox down to under fifty active conversations or tasks.
Recently, I’ve had a hard time getting my email inbox down to a manageable level. In fact, I’ve been hovering near 100, even at the end of the day. It occurred to me that I had several messages that were not pressing at all. They were just interesting, and I told myself, “I’m going to reply to this note or use it in some way when I get time. Eventually, of course, notes like these wind up at the bottom of my email stack (I sort my messages by most recently received).