$ORIGIN example.
$TTL 600

example.        IN SOA  example. admin.example. (
                                2008022501 ; serial
                                28800      ; refresh (8 hours)
                                7200       ; retry (2 hours)
                                604800     ; expire (1 week)
                                18000      ; minimum (5 hours)
                                )

@       IN      MX      10 mail.example.
@       IN      NS      ns1
@       IN      NS      ns2
@       IN      A       192.168.1.1