Registro DMARC
v=DMARC1; p=reject;

Servidores DNS Principal (mname) y Secundario (rname)
host: rostechbilling.com
class: IN
ttl: 900
type: SOA
mname: ns-1710.awsdns-21.co.uk
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Servidor de Correo
host: rostechbilling.com
class: IN
ttl: 2664
type: MX
pri: 0
target: 

Información TXT
host: rostechbilling.com
class: IN
ttl: 2664
type: TXT
txt: v=spf1 -all
entries: Array