With the closing of several secure email companies and the coming death of cloud storage in the US (from a global market perspective) I came up with an idea. I do not know if this idea has been implemented before but I think it might allow a certain level of privacy and security to email-like communications.
Currently you can encrypt the contents of your message but the sender and recipient information is not. Something that gets encrypted. Often the knowledge that two people are in communication is enough and the contents do not need to be deciphered for the message to have value to those who are watching.
What if there were a way to encrypt everything about the message?
If there were a secure message server that a person could connect to via an encrypted and secure connection with all communication only staying on that server (or servers all with secure links) would that be secure enough? It wouldn't be email because the messages would never travel over the internet in an email form as such no one could pull the 'envelope' data from the messages.