$TTL 10
@ IN SOA ns.firma.ch. postmaster.firma.ch. (
                2013021206        ; serial number
                10800                ; refresh [3h]
                3600                ; retry   [1h]
                604800                ; expire  [7d]
                10 )                ; minimum [1d]


@        IN        NS        ns.firma.ch.
@        IN        NS        ns2.firma.ch.

@        IN        MX        10        mx01
mx01        IN        A        10.20.120.151
foo        IN        A        127.0.0.1
        IN        A        127.0.0.3
mail        IN        CNAME        mail.firma.ch.
smtp        IN        CNAME        mail.firma.ch.