Registro DMARC
v=DMARC1;p=reject;

Registro IPv4
host: refra-lab.com
class: IN
ttl: 150
type: A
ip: 52.30.9.4

Servidores DNS Principal (mname) y Secundario (rname)
host: refra-lab.com
class: IN
ttl: 150
type: SOA
mname: docks18.rzone.de
rname: hostmaster.strato-rz.de
serial: 2020051404
refresh: 86400
retry: 7200
expire: 604800
minimum-ttl: 300

Servidor de Correo
host: refra-lab.com
class: IN
ttl: 150
type: MX
pri: 5
target: smtpin.rzone.de