Registro DMARC
v=DMARC1;p=quarantine

Servidores DNS Principal (mname) y Secundario (rname)
host: mbtatrac.com
class: IN
ttl: 7200
type: SOA
mname: NS49.WORLDNIC.com
rname: namehost.WORLDNIC.com
serial: 124090911
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: mbtatrac.com
class: IN
ttl: 7200
type: MX
pri: 10
target: mail.mbtatrac.com

Información TXT
host: mbtatrac.com
class: IN
ttl: 1800
type: TXT
txt: v=spf1 a mx ip4:209.190.172.121 ip4:209.190.171.106 ip4:209.190.172.106 -all
entries: Array