Registro DMARC
v=DMARC1; p=none; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Servidores DNS Principal (mname) y Secundario (rname)
host: att.biz
class: IN
ttl: 11161
type: SOA
mname: ns0.attdns.com
rname: eiss-dns.att.com
serial: 2026090201
refresh: 3600
retry: 1800
expire: 2592000
minimum-ttl: 300

Servidor de Correo
host: att.biz
class: IN
ttl: 11162
type: MX
pri: 120
target: mx4c45.carrierzone.com

Servidor de Correo
host: att.biz
class: IN
ttl: 11162
type: MX
pri: 100
target: mx2c45.carrierzone.com

Servidor de Correo
host: att.biz
class: IN
ttl: 11162
type: MX
pri: 10
target: mx1c45.carrierzone.com

Servidor de Correo
host: att.biz
class: IN
ttl: 11162
type: MX
pri: 110
target: mx3c45.carrierzone.com