I wish someone made a better (non-SMTP) messaging standard which is secure, efficient, easier to understand/implement and without a clutter of all legacy stuff

I wish someone made a better (non-SMTP) messaging standard which is secure, efficient, easier to understand/implement and without a clutter of all legacy stuff (and hopefully with a decent reference implementation!). Spams would still remain, but at least that would free us from worrying about the transportation layer security. (But then we might need to reinvent something like DNS on the way, so maybe that's why that no one is trying this.)