Registro DMARC
v=DMARC1; p=reject; rua=mailto:a@dmarc.facebookmail.com; pct=100

Servidor de Correo
host: mail.instagram.com
class: IN
ttl: 300
type: MX
pri: 10
target: smtpin.vvv.facebook.com

Información TXT
host: mail.instagram.com
class: IN
ttl: 2661
type: TXT
txt: google-site-verification=cL9ZyGuaz2vdqTuBw537IXLUjJqrM5-dGqI0Lm8RiFk
entries: Array

Información TXT
host: mail.instagram.com
class: IN
ttl: 2661
type: TXT
txt: v=spf1 include:facebookmail.com -all
entries: Array