Registro DMARC
v=DMARC; p=reject; rua=mailto:dmarc-reporting@roku.com; ruf=mailto:dmarc-reporting@roku.com; sp=reject; aspf=s; fo=0:1:d:s;"

Servidores DNS Principal (mname) y Secundario (rname)
host: w55c.net
class: IN
ttl: 13
type: SOA
mname: ns-573.awsdns-07.net
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: w55c.net
class: IN
ttl: 300
type: TXT
txt: v=spf1 -all
entries: Array