Registro DMARC
v=DMARC1; p=reject; fo=1; ri=3600; rua=mailto:nordstrom@rua.agari.com; ruf=mailto:nordstrom@ruf.agari.com

Servidores DNS Principal (mname) y Secundario (rname)
host: rack.app
class: IN
ttl: 21600
type: SOA
mname: ns1.markmonitor.com
rname: hostmaster.markmonitor.com
serial: 2019110403
refresh: 86400
retry: 3600
expire: 2592000
minimum-ttl: 172800