Registro DMARC
v=DMARC1; p=reject; sp=reject; adkim=r; aspf=r

Servidores DNS Principal (mname) y Secundario (rname)
host: et.com
class: IN
ttl: 900
type: SOA
mname: ns-337.awsdns-42.com
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: et.com
class: IN
ttl: 86400
type: TXT
txt: v=spf1 -all
entries: Array