Registro DMARC
v=DMARC1; p=reject; rua=mailto:dmarc@electrictower.biz; ruf=mailto:dmarc-forensics@electrictower.biz; fo=1; pct=100; ri=86400

Servidores DNS Principal (mname) y Secundario (rname)
host: electrictower.biz
class: IN
ttl: 900
type: SOA
mname: ns-687.awsdns-21.net
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400