@adbenitez @k3fnb @SrRochardBunson @VeroniqueB99 to make the point clearer, here's an example of a real E2EE message that federated between two Chatmail servers

Which metadata here is sensitive? Not the subject, it's faked as "[ ... ]". The real subject for the chat/group is included in the encrypted body along with all the other chat functionality.

There are no names. There are no client IP addresses. Every header except the ones needed for verifying the signature/authenticity have been scrubbed.

DeltaChat turns email servers into dumb routers of encrypted data packets.