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: atltoyota.com
class: IN
ttl: 1800
type: SOA
mname: ns1.penskeauto.com
rname: dns.cloudflare.com
serial: 2377182397
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800