Registro DMARC
v=DMARC1; p=reject; adkim=s; aspf=s

Servidores DNS Principal (mname) y Secundario (rname)
host: ru.com
class: IN
ttl: 3600
type: SOA
mname: ns0.centralnic.net
rname: hostmaster.centralnic.net
serial: 3000613889
refresh: 900
retry: 1800
expire: 6048000
minimum-ttl: 3600

Servidor de Correo
host: ru.com
class: IN
ttl: 3600
type: MX
pri: 0
target: 

Información TXT
host: ru.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 -all
entries: Array