The seven types of email you should never send:
1) Redundant reminder
2) Omnibus
3) Bad subject line
4) Midnight
5) "DoNotRelpy" ¯\_(ツ)_/¯
6) Should have been a process step
7) "Please see attached"
For elaboration, please see attached. (And it will be on my own website in 28 days...)
https://www.ft.com/content/5700be75-fc70-4cf3-ab69-e4fdd3c5ae74