Registro DMARC
v=DMARC1; p=none;

Servidores DNS Principal (mname) y Secundario (rname)
host: cocolog-nifty.com
class: IN
ttl: 900
type: SOA
mname: ns-20.awsdns-02.com
rname: awsdns-hostmaster.amazon.com
serial: 2
refresh: 7200
retry: 900
expire: 2419200
minimum-ttl: 900

Información TXT
host: cocolog-nifty.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 include:sendgrid.net include:ap.rp.oracleemaildelivery.com ~all
entries: Array