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Is there anything unsavory about ProtonMail?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I wouldn't really call the BE service "core" to what they provide. All the truly interesting code is in the clients. The server just an email service that stores the email in an encrypted format and talks their custom API.
An open source ProtonMail back-end won't help you in any way unless you're trying to host PM yourself I guess?