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$ttl    86400
$origin domain.tld.
@                       1d in soa       @ root (
                                        2004060401      ; serial (d. adams)
                                        3h              ; refresh
                                        15m             ; retry
                                        1w              ; expiry
                                        1d )            ; minimum

                        1d in ns        @
                        1d in ns        ns1.host.com.
                        1d in ns        ns2.host.com.
localhost               1d in a         127.0.0.1
tomain.tld.             1d in mx 10     mail.host.com.
domain.tld.             1d in a         1.2.3.4
www                     1d in a         1.2.3.4