@fastfinge @jae

> key exchange

It's Autocrypt, there's an RFC for it


Mime headers being encrypted? There's an RFC for it


The subject header being changed to [...] is a client / chatmail server implementation detail unnecessary

The Date header being smeared +- a few days is a client implementation detail too

None of that is required

All you needed to do to read the message in your email client is decrypt it. There are users reading messages in Thunderbird/Mutt/Proton Mail