Registro DMARC
v=DMARC1; p=none

Servidores DNS Principal (mname) y Secundario (rname)
host: circanos.com
class: IN
ttl: 300
type: SOA
mname: ns1.systemdns.com
rname: hostmaster.systemdns.com
serial: 1751980241
refresh: 10800
retry: 3600
expire: 300
minimum-ttl: 60

Servidor de Correo
host: circanos.com
class: IN
ttl: 300
type: MX
pri: 10
target: mail.protonmail.ch

Servidor de Correo
host: circanos.com
class: IN
ttl: 300
type: MX
pri: 20
target: mailsec.protonmail.ch

Información TXT
host: circanos.com
class: IN
ttl: 300
type: TXT
txt: protonmail-verification=ac6432a8526ec64b761e25bd9ad4aa34f61740eb
entries: Array

Información TXT
host: circanos.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 include:_spf.protonmail.ch mx ~all
entries: Array