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

Servidores DNS Principal (mname) y Secundario (rname)
host: dtmagnetics.com
class: IN
ttl: 3600
type: SOA
mname: ns1-01.azure-dns.com
rname: hostmaster
serial: 69
refresh: 900
retry: 600
expire: 86400
minimum-ttl: 3600

Servidor de Correo
host: dtmagnetics.com
class: IN
ttl: 3600
type: MX
pri: 0
target: 

Información TXT
host: dtmagnetics.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 -all
entries: Array