Servidores DNS Principal (mname) y Secundario (rname)
host: ismsgroup.com
class: IN
ttl: 3600
type: SOA
mname: ns-master.inet.vn
rname: postmaster.inet.vn
serial: 2015072800
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: ismsgroup.com
class: IN
ttl: 3600
type: MX
pri: 5
target: mail.ismsgroup.com

Información TXT
host: ismsgroup.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 ip4:103.57.223.107 mx ~all
entries: Array