Encrypting the e-mails on the server is difficult. Encrypting the messages between the servers is doable as well, but the other server must be configured to allow it as well. End-to-end encryption is quite difficult but not because of technical reasons. You have to convince the person you're communicating with to create a GPG key and use it. Furthermore, this person will likely use it on a proprietary OS anyway, so it can be considered compromised anyway.

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