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: avivaaem.com
class: IN
ttl: 6325
type: SOA
mname: dns1.cscdns.net
rname: hostmaster.cscdns.net
serial: 2016061585
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 300