Mine

$TTL 3600
$ORIGIN coruscant.cx.
@               IN      SOA     ns1.ninth-art.de. hostmaster.coruscant.cx. (
                                2006101901      ; serial - year+month+day+serial (max. 10 digits)
                                7200            ; refresh, seconds
                                1800            ; retry, seconds
                                604800          ; expire, seconds
                                3600 )          ; TTL, seconds
therion@coruscant /var/named/etc/namedb/master % cat coruscant.cx.zone

                IN      TXT     "v=spf1 mx ~all"
                IN      NS      ns1.ninth-art.de.
                IN      NS      ns2.ninth-art.de.
                IN      NS      ns3.ninth-art.de.
                IN      MX      5 mail.coruscant.info.
                IN      A       127.0.0.1