neutron
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emersion
encrypting incoming emails
This is just an enhancement idea, me thinking out loud. Unfortunately I don't know the internals of the Protonmail web client and I cannot contribute any usable code to neutron.
How could incomming emails be encrypted? Maybe by an LMTP server that sits between Postfix and Dovecot?
World --smtp--> Postfix --lmtp--> Neutron encryption --lmtp--> Dovecot local delivery
Does this make any sense? Could it work?
Another idea would be that the web client encrypts unencrypted emails via IMAP.
The first solution can work pretty well. I prefer it over the second one since messages would be stored encrypted from the start.
The most elegant implementation I could find (using Dovecot), was this one : https://perot.me/encrypt-specific-incoming-emails-using-dovecot-and-sieve
You may also be interested with these: https://0xacab.org/riseuplabs/trees https://www.grepular.com/Automatically_Encrypting_all_Incoming_Email http://kacangbawang.com/encrypting-stored-email-with-postfix/
Although I am uncertain how this is related to neutron mail.
