Servidores DNS Principal (mname) y Secundario (rname)
host: approach.email
class: IN
ttl: 180
type: SOA
mname: scales.dnspod.net
rname: freednsadmin.dnspod.com
serial: 1744001772
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 180

Servidor de Correo
host: approach.email
class: IN
ttl: 600
type: MX
pri: 10
target: mx.geeksend.email