anchor.diff:        };
   
         lookupMX = mkOption {
  +        type = types.bool;
           default = false;
           description = "
             Whether relay specified is just domain whose MX must be used.
  
positive.code:       };
  
        origin = mkOption {
          default = "";
          description ="
            Origin to use in outgoing e-mail. Leave blank to use hostname.
  
negative.code:       };
  
        virtual = mkOption {
          type = types.lines;
          default = "";
          description = "
            Entries for the virtual alias map, cf. man-page virtual(8).
  