Registro DMARC
v=DMARC1; p=none; rua=mailto:dns@effinity.fr;

Servidores DNS Principal (mname) y Secundario (rname)
host: m6web-tracking.com
class: IN
ttl: 21600
type: SOA
mname: ns-cloud-b1.googledomains.com
rname: cloud-dns-hostmaster.google.com
serial: 1
refresh: 21600
retry: 3600
expire: 259200
minimum-ttl: 300

Información TXT
host: m6web-tracking.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 ?all
entries: Array