Registro DMARC
v=DMARC1; p=reject;rua=mailto:dmarc_rua@emaildefense.proofpoint.com;ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com;fo=1

Servidores DNS Principal (mname) y Secundario (rname)
host: nexac.com
class: IN
ttl: 3600
type: SOA
mname: ns1.markmonitor.com
rname: hostmaster.markmonitor.com
serial: 2024121301
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 30

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