Registro DMARC
v=DMARC1; p=reject; pct=100; rua=mailto:dmarc-yahoo-rua@yahoo-inc.com;

Servidores DNS Principal (mname) y Secundario (rname)
host: btrll.com
class: IN
ttl: 1800
type: SOA
mname: hidden-master.yahoo.com
rname: hostmaster.yahoo-inc.com
serial: 2024062801
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 600

Servidor de Correo
host: btrll.com
class: IN
ttl: 1800
type: MX
pri: 10
target: mail.brightroll.com