Servidores DNS Principal (mname) y Secundario (rname)
host: cirew.com
class: IN
ttl: 7200
type: SOA
mname: NS43.WORLDNIC.com
rname: namehost.WORLDNIC.com
serial: 126050115
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: cirew.com
class: IN
ttl: 900
type: MX
pri: 10
target: inbound-smtp.us-east-1.amazonaws.com