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configure your mail server so that when an outgoing e-mail is sent, I enforce STARTTLS ... verify the certificate I would pin in the next session. If the certificate does not match, the e-mail doesn't get sent. There are several problems: The mail is delivered in multiple hops, e.g. from your mail client to your mail server from their to the mail ...


What attacks do you want to prevent? If a malicious system administrator (or anybody/any agency forcing him to be one) is contained in the list, you're out of luck without end-to-end encryption, no matter what fancy validation schemes you apply. Regarding your approach: as I understand, it is absed on the idea that nobody will be able to control different ...

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