f412df1f6b
The postfix exporter needs to access postfix's `queue/public/` directory to read the `showq` socket inside. Instead of making the public directory world accessible, this sets the postfix exporter's group to `postdrop` by default, when the postfix service is enabled.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.