Servidores DNS Principal (mname) y Secundario (rname)
host: dl.net.cn
class: IN
ttl: 180
type: SOA
mname: ns11.xincache.com
rname: ns12.xincache.com
serial: 1738164906
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 180

Servidor de Correo
host: dl.net.cn
class: IN
ttl: 600
type: MX
pri: 10
target: mxbiz2.qq.com

Servidor de Correo
host: dl.net.cn
class: IN
ttl: 600
type: MX
pri: 5
target: mxbiz1.qq.com