Servidores DNS Principal (mname) y Secundario (rname)
host: listy.de
class: IN
ttl: 21600
type: SOA
mname: nsa6.schlundtech.de
rname: info.security4net.de
serial: 2016122800
refresh: 43200
retry: 7200
expire: 1209600
minimum-ttl: 86400

Servidor de Correo
host: listy.de
class: IN
ttl: 21600
type: MX
pri: 10
target: mail.listy.de