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

Servidores DNS Principal (mname) y Secundario (rname)
host: sugarsubstitution.org
class: IN
ttl: 300
type: SOA
mname: ns-cloud-c1.googledomains.com
rname: cloud-dns-hostmaster.google.com
serial: 4
refresh: 21600
retry: 3600
expire: 259200
minimum-ttl: 300

Información TXT
host: sugarsubstitution.org
class: IN
ttl: 14400
type: TXT
txt: v=spf1 -all
entries: Array