Registro DMARC
v=DMARC1; p=none; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Servidores DNS Principal (mname) y Secundario (rname)
host: semisweetchocolatebar.com
class: IN
ttl: 1800
type: SOA
mname: ns01.elcompanies.com
rname: dns.cloudflare.com
serial: 2402975558
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800