Registro DMARC
v=DMARC1;p=none;

Servidores DNS Principal (mname) y Secundario (rname)
host: mcc.lt
class: IN
ttl: 10800
type: SOA
mname: dns1.balt.net
rname: hostmaster.balt.net
serial: 2017010605
refresh: 3600
retry: 900
expire: 604800
minimum-ttl: 60

Servidor de Correo
host: mcc.lt
class: IN
ttl: 21600
type: MX
pri: 10
target: pastas.balt.net

Información TXT
host: mcc.lt
class: IN
ttl: 3600
type: TXT
txt: v=spf1 mx a:_spf.balt.net -all
entries: Array