Reminds me a bit of Scott Hanselman's "One Email Rule" https://www.hanselman.com/blog/one-email-rule-have-a-separat... that requires a bit of training on other people's part (for the good of all)
I make a point to clean my email to 0 daily.
I don’t always get there, but often.
I consider email ephemeral and it should have a very short life.