Registro DMARC
v=DMARC1; p=reject; rua=mailto:dmarc_agg@dmarc.250ok.net; ruf=mailto:dmarc_fr@dmarc.250ok.net; fo=1; pct=100; rf=afrf

Servidores DNS Principal (mname) y Secundario (rname)
host: engagemsg.com
class: IN
ttl: 900
type: SOA
mname: ns-175.awsdns-21.com
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: engagemsg.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 include:u454642.wl.sendgrid.net include:sendgrid.net ~all
entries: Array