E-Mail was designed without encryption and authentication in mind, so everything that protects us against spoofed senders and being completely open to anyone on the wire and noosy curious server admins, was added later on top. To be blunt, the user experience isn't good. All things you have to opt-in, aren't properly handled by everyones client or infrastructure. Therefore Lavabits Ladar Lavison tried to create a new revised e-mail protocol suite, the Dark Internet Mail Environment, called DIME. (https://archive.org/details/Dark_Mail_specifications_dark-internet-mail-environment-june-2018) It protects meta-data by default and wraps everything in a tor-like set of onion layers. Only the Sender and the Recipient know the full relationship between the two. The sending server only knows the receiving server, but not the end user that gets the mail. The receiving server knows which server delivered the mail, but not the useraccount that send the e-mail. I'd like to see this spec being picked up, standardised , implemented in Thunderbird so we have a modern way to send our e-mails that protects us by default in a similar way to what messengers already deliver.
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