This is the answer, bbc is the solution.
To get less “tech inclined” people to use the bbc feature is another story.
Sending a email to the whole office from HR, bbc all recipients. Then recipients can only reply to HR, and not 600 plus staff members, into a email chain that last all day asking people to stop replying all, while replying all at the same time.
Older generation “nobody wants to fight anymore”.