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

Registro IPv4
host: Business.Facebook.com
class: IN
ttl: 90
type: A
ip: 157.240.5.12

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: v=spf1 include:_spf.facebook.com -all
entries: Array

Registro IPv6
host: Business.Facebook.com
class: IN
ttl: 90
type: AAAA
ipv6: 2a03:2880:f085:d:face:b00c::2