* pkgs.formats.yaml_1_2: init
Same as YAML 1.1 but relies on the unpinned remarshal version which emits
YAML 1.2.
* nixos/postfix-tlspol: init
MTA-STS and DANE/TLSA resolver and TLS policy socketmap server for
Postfix.
* nixos/tests/postfix-tlspol: init
Simple test if the service comes up and the CLI can interact with it and
gives reasonable results.
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