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

Registro IPv4
host: business.facebook.com
class: IN
ttl: 38
type: A
ip: 157.240.243.14

Servidor de Correo
host: business.facebook.com
class: IN
ttl: 3600
type: MX
pri: 10
target: smtpin.vvv.facebook.com

Información TXT
host: business.facebook.com
class: IN
ttl: 3600
type: TXT
txt: apple-domain-verification=dNsR5xrZclUflC5UHJQ3NNJZOKbBcIMGJMvVYuw2Zb8
entries: Array

Información TXT
host: business.facebook.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:_spf.facebook.com -all
entries: Array