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{
  config,
  lib,
  ...
}:
with lib; let
  inherit (config.local) domains;
in {
  options.local.ns.zones = mkOption {
    type = with lib.types;
      attrsOf (submodule ({
        config,
        name,
        ...
      }: {
        options.localMX = {
          enable = mkEnableOption "local MX settings";
        };

        config = mkIf config.localMX.enable {
          mx = [
            {
              name = "@";
              priority = 10;
              host = "${domains.smtp.gated}.";
            }
            {
              name = "@";
              priority = 20;
              host = "${domains.smtp-backup.main}.";
            }
            # Many thanks to junkemailfilter.com for all their years of service. RIP.
            #{ name = "@"; priority = 30; host = "mxbackup1.junkemailfilter.com."; }
            #{ name = "@"; priority = 40; host = "mxbackup2.junkemailfilter.com."; }
          ];

          txt =
            [
              {
                name = "@";
                text = "v=spf1 mx a -all";
              }
              {
                name = "_dmarc";
                text = "v=DMARC1;p=reject;sp=reject;adkim=r;aspf=r;fo=1;rf=afrf;rua=mailto:postmaster@${name}";
              }
              {
                name = "_adsp._domainkey";
                text = "dkim=all";
              }
            ]
            ++ map
            (selector: {
              name = "${toString selector}._domainkey";
              text = readFile (./dkim + "/${toString selector}.txt");
            }) [202001 202102 202402 202408];
        };
      }));
  };
}