[brigandish]

The ability to encrypt messages that's easy enough that non tech professionals can use it - or even tech professionals.

I'd like to be able to read mails simply by sorting them into filesystem folders and reading them like text files. The need to understand mbox and mdir and emix or whatever other formats are out there is annoying. I want to be able to read them with or without an app, and for different apps to read from the same data without reorganising it. Why should I have 3 different stores of the same emails on my laptop because I installed 3 different mail clients?

If you're really coming up with a whole new system then clarify your terms - what's the different between an MTA or and MRU or an MDA… I remember physics lectures easier than this.

I could go on all day. Good luck, I genuinely hope you manage it.