Registro DMARC
v=DMARC1;p=reject;sp=reject

Servidores DNS Principal (mname) y Secundario (rname)
host: marketingstudio.com
class: IN
ttl: 3600
type: SOA
mname: ns1-09.azure-dns.com
rname: azuredns-hostmaster.microsoft.com
serial: 1
refresh: 3600
retry: 300
expire: 2419200
minimum-ttl: 300

Información TXT
host: marketingstudio.com
class: IN
ttl: 5483
type: TXT
txt: v=spf1 -all
entries: Array

Información TXT
host: marketingstudio.com
class: IN
ttl: 5483
type: TXT
txt: _globalsign-domain-verification=nm3hk2PgGbeOhCY1j4v6HTO_DxWB8F0wT7zdWCjbCQ
entries: Array