Registro DMARC
v=spf1 include:mailgun.org ~all

Registro IPv4
host: nomfm.com
class: IN
ttl: 7200
type: A
ip: 208.91.197.27

Servidores DNS Principal (mname) y Secundario (rname)
host: nomfm.com
class: IN
ttl: 7200
type: SOA
mname: NS65.WORLDNIC.com
rname: namehost.WORLDNIC.com
serial: 114072719
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: nomfm.com
class: IN
ttl: 7200
type: MX
pri: 10
target: mxb.mailgun.org

Servidor de Correo
host: nomfm.com
class: IN
ttl: 7200
type: MX
pri: 10
target: mxa.mailgun.org