I’m starting to use this where meaningful on my emails. As I routinely receive hundreds of emails that require a response or an action each day, this helps cut down email and keeps me organized. You can even get all creative by setting up filters and such.
This email is: [ ] actionable [x] fyi [ ] social
Response needed: [ ] yes [x] if you want [ ] no
Time-sensitive: [ ] immediate [ ] soon [x] none
Maybe it will help you.