Registro DMARC
v=DMARC1;p=quarantine;rua=mailto:admin@sqnmail.com

Servidores DNS Principal (mname) y Secundario (rname)
host: sqnmail.com
class: IN
ttl: 180
type: SOA
mname: a.dnspod.com
rname: domainadmin.dnspod.com
serial: 1716631740
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 180

Servidor de Correo
host: sqnmail.com
class: IN
ttl: 600
type: MX
pri: 1
target: mx.sqnmail.com

Información TXT
host: sqnmail.com
class: IN
ttl: 600
type: TXT
txt: v=spf1 a mx ~all
entries: Array