Registro DMARC
v=DMARC1; p=none;

Servidores DNS Principal (mname) y Secundario (rname)
host: yarnclasses.com
class: IN
ttl: 169436
type: SOA
mname: ns1.dnsowl.com
rname: hostmaster.dnsowl.com
serial: 1769879801
refresh: 7200
retry: 1800
expire: 1209600
minimum-ttl: 600

Servidor de Correo
host: yarnclasses.com
class: IN
ttl: 240
type: MX
pri: 10
target: mx4.emailowl.com

Servidor de Correo
host: yarnclasses.com
class: IN
ttl: 240
type: MX
pri: 20
target: mx5.emailowl.com

Servidor de Correo
host: yarnclasses.com
class: IN
ttl: 240
type: MX
pri: 30
target: mx6.emailowl.com

Información TXT
host: yarnclasses.com
class: IN
ttl: 240
type: TXT
txt: v=spf1 a mx -all
entries: Array