Registro DMARC
v=DMARC1; p=quarantine; adkim=r; aspf=r; rua=mailto:dmarc_rua@onsecureserver.net;

Servidores DNS Principal (mname) y Secundario (rname)
host: atra.mx
class: IN
ttl: 3600
type: SOA
mname: ns65.domaincontrol.com
rname: dns.jomax.net
serial: 2026072800
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 600