Answer e-mail in time

Distinguish reading email from processing email. When processing, don’t spend time on each email; just glance through each to see whether it’s something you want to read or respond to, otherwise delete it immediately. Move those you might want to read or respond to into another folder, which you then read in turn, as you have time. Make sure this folder doesn’t pile up.

As of now, I have 203 unread emails, which I’ve kept marked unread to remember to respond to them. The oldest from two years ago, almost on the day.