$TTL 1d
@ IN SOA ns1.example.com. root.example.com. (
        2016010101      ; serial
        28800           ; refresh (8 hours)
        7200            ; retry (2 hours)
        2419200         ; expire (4 weeks)
        86400           ; minimum (1 day)
)
                NS      ns1.example.com.
                NS      ns2.example.net.
                NS      ns3.example.org.
                NS      ns4.example.com.
ns1             IN      A               1.2.3.4
ns2             IN      A               1.2.3.4
ns3             IN      A               1.2.3.4
ns4             IN      A               1.2.3.4
@               IN      A               1.2.3.4
www             IN      CNAME   @
@               IN      MX      1       aspmx.l.google.com.
@               IN      MX      5       alt1.aspmx.l.google.com.
@               IN      MX      5       alt2.aspmx.l.google.com.
@               IN      MX      10      aspmx2.googlemail.com.
@               IN      MX      10      aspmx3.googlemail.com.
@               IN      TXT             "v=spf1 mx a include:_spf.google.com ~all"