Registro DMARC
v=DMARC1; pct=100; p=reject

Servidores DNS Principal (mname) y Secundario (rname)
host: internet-information-services.com
class: IN
ttl: 900
type: SOA
mname: ns-435.awsdns-54.com
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: internet-information-services.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 +mx +a -all
entries: Array