Servidores DNS Principal (mname) y Secundario (rname)
host: pemex.com.mx
class: IN
ttl: 1800
type: SOA
mname: a1-68.akam.net
rname: hostmaster.pemex.com.mx
serial: 2024090601
refresh: 3600
retry: 600
expire: 604800
minimum-ttl: 300

Servidor de Correo
host: pemex.com.mx
class: IN
ttl: 1
type: MX
pri: 10
target: email.pemex.com