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: mbmedicalgroup.biz
class: IN
ttl: 21600
type: SOA
mname: edns1.ultradns.com
rname: premiumdns.support.neustar
serial: 2025052303
refresh: 86400
retry: 86400
expire: 86400
minimum-ttl: 86400