Registro DMARC
v=spf1 mx a include:mail28.mydevil.net -all

Registro IPv4
host: belfer.net.pl
class: IN
ttl: 3600
type: A
ip: 31.186.82.144

Servidores DNS Principal (mname) y Secundario (rname)
host: belfer.net.pl
class: IN
ttl: 1200
type: SOA
mname: dns1.mydevil.net
rname: admin.admin.net.pl
serial: 2018130003
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 10800

Servidor de Correo
host: belfer.net.pl
class: IN
ttl: 3600
type: MX
pri: 10
target: mail28.mydevil.net

Información TXT
host: belfer.net.pl
class: IN
ttl: 3600
type: TXT
txt: v=spf1 mx a include:mail28.mydevil.net -all
entries: Array