Registro DMARC
v=spf1 a -all

Servidores DNS Principal (mname) y Secundario (rname)
host: rooo.org
class: IN
ttl: 1800
type: SOA
mname: aragorn.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2370030660
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: rooo.org
class: IN
ttl: 300
type: MX
pri: 27
target: route2.mx.cloudflare.net

Servidor de Correo
host: rooo.org
class: IN
ttl: 300
type: MX
pri: 79
target: route3.mx.cloudflare.net

Servidor de Correo
host: rooo.org
class: IN
ttl: 300
type: MX
pri: 78
target: route1.mx.cloudflare.net

Información TXT
host: rooo.org
class: IN
ttl: 300
type: TXT
txt: v=spf1 include:_spf.mx.cloudflare.net ~all
entries: Array