Servidores DNS Principal (mname) y Secundario (rname)
host: Toing.com
class: IN
ttl: 2560
type: SOA
mname: a.ns.Toing.com
rname: hostmaster.Toing.com
serial: 1769444521
refresh: 16384
retry: 2048
expire: 1048576
minimum-ttl: 2560

Servidor de Correo
host: Toing.com
class: IN
ttl: 21600
type: MX
pri: 0
target: a.mx.Toing.com