How to clear your inbox every day.
As a newly-qualified accountant I took a time management course. It still helps me today. One part of it was how to deal with incoming post. I learned there were four things you could do with an incoming item of post. They were, in descending order of preference: throw it in the bin, delegate it to someone, file it, or act on it. Over the decades since I took that course post has been replaced by email and I receive far more email messages every day than I ever had letters.