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The Death of Decentralized Email
(blog.lopp.net)
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It was one of LinuxBabe's guides - this one:
https://www.linuxbabe.com/mail-server/setup-basic-postfix-mail-sever-ubuntu
There is a more recent one that uses a shell script to install all the bits and pieces but I prefer to do it myself so I've got at least some idea of how all the pieces work.
This is very helpful. Thank you!