If I ever set up another email system for a company, I’m going to configure a dud internal address named asshole, with a filtering rule set so any message composed with asshole as a recipient (either To: or Cc:) gets held, undelivered, until you remove the fake address.
Likewise filter if asshole appears in the first line or two of the body text.
This way it’s possible to compose something like:
Dear Clueless Waste of Oxygen,
… stuff that makes you feel better but that you would never, EVER send … ooops
This probably would have saved a certain person (not me!) a huge headache a not too long ago . . .