Servidores DNS Principal (mname) y Secundario (rname)
host: umin.jp
class: IN
ttl: 21600
type: SOA
mname: db.umin.ac.jp
rname: postmast-ctr.umin.ac.jp
serial: 2025040300
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 86400

Servidor de Correo
host: umin.jp
class: IN
ttl: 21600
type: MX
pri: 10
target: mailgw.umin.ac.jp