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

Servidores DNS Principal (mname) y Secundario (rname)
host: marathonoilcorp.com
class: IN
ttl: 19276
type: SOA
mname: dns1.cscdns.net
rname: hostmaster.cscdns.net
serial: 2025111102
refresh: 86400
retry: 86400
expire: 86400
minimum-ttl: 86400