Registro DMARC
v=DMARC1; p=reject; rua=mailto:c0f1617a@inbox.ondmarc.com; ruf=mailto:c0f1617a@inbox.ondmarc.com;

Servidores DNS Principal (mname) y Secundario (rname)
host: core2038.com
class: IN
ttl: 13177
type: SOA
mname: a1-76.akam.net
rname: hostmaster.core2038.com
serial: 2022082501
refresh: 3600
retry: 600
expire: 604800
minimum-ttl: 300

Información TXT
host: core2038.com
class: IN
ttl: 1800
type: TXT
txt: v=spf1 -all
entries: Array