Registro DMARC
v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_agg@auth.returnpath.net; 
ruf=mailto:dmarc_afrf@auth.returnpath.net

Servidor de Correo
host: mail.dnb.com
class: IN
ttl: 300
type: MX
pri: 0
target: mail-dnb-com.mail.protection.outlook.com

Servidor de Correo
host: mail.dnb.com
class: IN
ttl: 300
type: MX
pri: 10
target: feedback-smtp.eu-west-1.amazonses.com

Información TXT
host: mail.dnb.com
class: IN
ttl: 900
type: TXT
txt: v=spf1  ip4:107.20.210.250 ip4:52.1.14.157 ip4:12.130.135.0/24 ip4:199.7.200.0/21 include:spf.protection.outlook.com include:amazones.com include:sendgrid.net ~all
entries: Array

Información TXT
host: mail.dnb.com
class: IN
ttl: 900
type: TXT
txt: V0+ZILyBmbBoZA9bjnr7oZVWTB+eH5VCRjjs+JCypTgy2969+VFIlmrVttpbW660DmC33ZPg9Kbuw6pZNUFtOw==
entries: Array