Servidores DNS Principal (mname) y Secundario (rname)
host: el-alt.com
class: IN
ttl: 2560
type: SOA
mname: ns1.everleap.com
rname: hostmaster.everleap.com
serial: 1727566830
refresh: 16384
retry: 2048
expire: 1048576
minimum-ttl: 2560

Servidor de Correo
host: el-alt.com
class: IN
ttl: 3600
type: MX
pri: 10
target: corpmail.hostcollective.com