Servidores DNS Principal (mname) y Secundario (rname)
host: twt.edu.cn
class: IN
ttl: 3600
type: SOA
mname: ns.twt.edu.cn
rname: admin.tju.edu.cn
serial: 2100000438
refresh: 3600
retry: 300
expire: 86400
minimum-ttl: 3600

Servidor de Correo
host: twt.edu.cn
class: IN
ttl: 3600
type: MX
pri: 5
target: inmail.twtstudio.com

Información TXT
host: twt.edu.cn
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:spf.inmail.twtstudio.com ~all
entries: Array