Servidores DNS Principal (mname) y Secundario (rname)
host: jcy.gov.cn
class: IN
ttl: 3600
type: SOA
mname: ns1.cdns.cn
rname: mail.cnnic.cn
serial: 8061
refresh: 3600
retry: 600
expire: 2419200
minimum-ttl: 800

Servidor de Correo
host: jcy.gov.cn
class: IN
ttl: 3600
type: MX
pri: 1
target: smtp.spp.gov.cn