Servidores DNS Principal (mname) y Secundario (rname)
host: 5zj.org
class: IN
ttl: 600
type: SOA
mname: dns7.hichina.com
rname: hostmaster.hichina.com
serial: 2024060609
refresh: 3600
retry: 1200
expire: 86400
minimum-ttl: 600

Servidor de Correo
host: 5zj.org
class: IN
ttl: 3600
type: MX
pri: 10
target: mx.ym.163.com