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Re:Small mail server best current practices by mjsir911 on Sunday July 26, 2020 @09:36PM (#23961557)
The push for me to use nixos was simple-nixos-mailserver which does exactly this while being fully configurable & extensible.

https://gitlab.com/simple-nixos-mailserver/nixos-mailserver

Re:Small mail server best current practices by mekster on Tuesday July 28, 2020 @01:07PM (#23978049)
Doesn't seem to have external user auth mechanism than "declarative user management"?