If you need security or privacy, there's an app for that™, and it ain't email. Email wasn't designed to be such, and trying to workaround the design to make it

If you need security or privacy, there's an app for that™, and it ain't email. Email wasn't designed to be such, and trying to workaround the design to make it, is fragile and error prone, with multiple opsec pitfalls, it's practically impossible long term.