@               IN SOA          localhost. root.localhost. (
                                        1998010301      ; Serial
                                        10800           ; Refresh every 3 hours
                                        3600            ; Retry after 1 hour
                                        604800          ; Expire after 1 week
                                        86400           ; Minimum TTL 1 day
                                )
                IN NS           localhost.

localhost.      IN A            127.0.0.1
localhost.      IN MX           100 localhost.