Servidores DNS Principal (mname) y Secundario (rname)
host: isl.ac.cn
class: IN
ttl: 3600
type: SOA
mname: ns.isl.ac.cn
rname: mail.isl.ac.cn
serial: 20
refresh: 28800
retry: 3600
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: isl.ac.cn
class: IN
ttl: 3600
type: MX
pri: 5
target: mx.cstnet.cn

Información TXT
host: isl.ac.cn
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:spf.mail.cstnet.cn -all
entries: Array