rules {
  WHITELIST_FORWARDING_HOST_NO_REJECT {
    action = "add header";
    expression = "WHITELISTED_FWD_HOST";
    require_action = ["reject"];
  }
  WHITELIST_FORWARDING_HOST_NO_GREYLIST {
    action = "no action";
    expression = "WHITELISTED_FWD_HOST";
    require_action = ["greylist", "soft reject"];
  }
}