Registro DMARC
v=DMARC1; p=none; rua=mailto:postmaster@gr13.com

Servidores DNS Principal (mname) y Secundario (rname)
host: gr13.com
class: IN
ttl: 1800
type: SOA
mname: bradley.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2410538192
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: gr13.com
class: IN
ttl: 300
type: MX
pri: 10
target: maildev

Información TXT
host: gr13.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 ip4:24.247.230.227 ~all
entries: Array