{
  inputs,
  config,
  ...
}: let
  config' = config;
in {
  flake.nixngConfigurations.getmail = inputs.nixng.nglib.makeSystem {
    system = "x86_64-linux";
    name = "ra-systems-getmail";
    inherit
      (inputs)
      nixpkgs
      ;
    config = {
      pkgs,
      config,
      ...
    }: {
      config = {
        dumb-init = {
          enable = true;
          type.services = {};
        };

        users.users."vmail" = {
          uid = config.ids.uids.vmail;
          description = "vmail user.";
          group = "vmail";
          shell = "${pkgs.bash}/bin/bash";
        };
        users.groups."vmail" = {
          gid = config.ids.gids.vmail;
        };

        init.services.getmail = {
          shutdownOnExit = true;
          script = let
            pkgs' = pkgs.appendOverlays (with config'.flake.overlays; [
              courier-unicode
              getmail6
              maildrop
            ]);
            PATH = with pkgs';
              lib.makeBinPath [
                jq
                busybox
                runit
                bash
                getmail6
                maildrop
              ];
          in
            pkgs.writeShellScript "getmail-run" ''
              export PATH=${PATH}:${pkgs.opensmtpd}/libexec/opensmtpd:$PATH

              set -m

              for rcfile in /mail-configuration/getmail.d/*.rc
              do
                filename="$(basename "''${rcfile}")"
                email="''${filename%".rc"}"

                mkdir -p "/getmail.d/''${email}"
                chown vmail:vmail -R "/getmail.d/''${email}"

                (
                  while true
                  do
                    chpst -u vmail:vmail getmail -i INBOX -n -r "$rcfile" --getmaildir "/mail-configuration/getmail.d/''${email}"
                    sleep 10
                  done
                ) &
              done

              wait
            '';
          enabled = true;
        };
      };
    };
  };
}
# /usr/lib/sendmail -i -oem -f %F %T