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

Servidores DNS Principal (mname) y Secundario (rname)
host: mainline-sales.com
class: IN
ttl: 3600
type: SOA
mname: ns15.domaincontrol.com
rname: dns.jomax.net
serial: 2025050503
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 600

Información TXT
host: mainline-sales.com
class: IN
ttl: 21600
type: TXT
txt: v=spf1 -all
entries: Array