Documented? Email is a good asynchronous messaging protocol, it's not a great one though. I'd say authentication would be a requirement for such a protocol t

Documented? Email is a good asynchronous messaging protocol, it's not a great one though. I'd say authentication would be a requirement for such a protocol to be great. I think the next logical step of content protection (encryption) is free if you have authentication and most would want it too. You also don't know if a message has been received, ignored, or blocked by a spam filter. It's good, it does manage to work and deliver billions of messages a day. And it works pretty well. It's infuriating when it doesn't though.