I utterly lothe that this is true but I have one solid argument for needing centerlization of email. It is spam filtering. Both incoming and not getting filtered by others outgoing.

I’m sure it is solvable through other means but I can assure you working in IT myself that is isn’t an easy solve which is why this has won out in practice.

I always preferred this one in the format of

Little Johnny drank

But he said drink no more

For what he thought was H2O

Was H2SO4