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There are already communication protocols that implement proof-of-work. Bitmessage is just like email, but serverless, the encrypted messages are stored peer-to-peer. And you do (small amounts of) proof-of-work to prevent spam. The difficulty depends on the size of the message, and you can even increase the proof-of-work needed for your own address, if you for some reason receive any spam. Bitmessage is a really good concept, it fixes many flaws of email, it could replace email, if only there were more users, supporters, developers.
I just rewrote my mailserver configs. It's not containerized yet but I did use docker-mailserver as a baseline configuration to start with. That project checks all the boxes you mentioned.
Aether, a decentralized, serverless Reddit-alternative does the same thing, but for public posts.
You don't. Your have one password per service, those passwords are like 20 random characters stored in your (offline) password database, of which you have at least 3 copies, one of which is in a bank vault or something.