Servidores DNS Principal (mname) y Secundario (rname)
host: nht.ru
class: IN
ttl: 21600
type: SOA
mname: ns1.ti.ru
rname: hostmaster.ti.ru
serial: 2022040500
refresh: 7200
retry: 1800
expire: 604800
minimum-ttl: 86400

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