Servidores DNS Principal (mname) y Secundario (rname)
host: itelcel.com
class: IN
ttl: 3600
type: SOA
mname: dns1i.itelcel.com
rname: hecmarcr.mail.telcel.com
serial: 354543517
refresh: 3600
retry: 300
expire: 3600000
minimum-ttl: 86400

Servidor de Correo
host: itelcel.com
class: IN
ttl: 1123
type: MX
pri: 5
target: mx3.itelcel.com

Servidor de Correo
host: itelcel.com
class: IN
ttl: 1123
type: MX
pri: 10
target: mx1.itelcel.com

Servidor de Correo
host: itelcel.com
class: IN
ttl: 1123
type: MX
pri: 10
target: mx2.itelcel.com