Except it doesn't solve the traffic analysis problem. It doesn't because it can't. Out of the list posted by the GP the following aren't fixed by mailpile and

Except it doesn't solve the traffic analysis problem. It doesn't because it can't. Out of the list posted by the GP the following aren't fixed by mailpile and can't be because it has to use SMTP: modern content encapsulation / PKI / mandatory authentication / SPAM control.