Servidores DNS Principal (mname) y Secundario (rname)
host: Slc21.com
class: IN
ttl: 3600
type: SOA
mname: ns1.sdsns.com
rname: firechoi.sds.co.kr
serial: 2012122814
refresh: 3600
retry: 300
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: Slc21.com
class: IN
ttl: 3600
type: MX
pri: 0
target: mail.protection.outlook.com

Información TXT
host: Slc21.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:spf.protection.outlook.com -all
entries: Array