Servidores DNS Principal (mname) y Secundario (rname)
host: mag-city.ru
class: IN
ttl: 900
type: SOA
mname: ns1.masterhost.ru
rname: hostmaster.masterhost.ru
serial: 1682646919
refresh: 28800
retry: 7200
expire: 1209600
minimum-ttl: 600

Servidor de Correo
host: mag-city.ru
class: IN
ttl: 900
type: MX
pri: 10
target: mx4.masterhost.ru