I suspect I'm a few years older than you 8) I run many small (and a few quite bigger than small) email ingress/egress systems for several decades now. I also

I suspect I'm a few years older than you 8) I run many small (and a few quite bigger than small) email ingress/egress systems for several decades now. I also worry about a fair few mailbox stores. Email is quite old and was never designed to worry about things like security. It was designed to get a message from A -> B. Regardless of that, it is the Pony Express realised (says British bloke!)