Servidores DNS Principal (mname) y Secundario (rname)
host: bbxint.com
class: IN
ttl: 3601
type: SOA
mname: dns1.registrar-servers.com
rname: hostmaster.registrar-servers.com
serial: 1573430781
refresh: 43200
retry: 3600
expire: 604800
minimum-ttl: 3601

Servidor de Correo
host: bbxint.com
class: IN
ttl: 1800
type: MX
pri: 10
target: mail.bbxint.com