Registro DMARC
v=DMARC1; p=reject; rua=mailto:a.84sm1mak@sdmarc.net; adkim=r; aspf=r

Registro IPv4
host: nextgen-email.com
class: IN
ttl: 300
type: A
ip: 54.75.241.46

Servidores DNS Principal (mname) y Secundario (rname)
host: nextgen-email.com
class: IN
ttl: 1018
type: SOA
mname: courtney.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2415675792
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: nextgen-email.com
class: IN
ttl: 300
type: MX
pri: 10
target: mxb.mailgun.org

Servidor de Correo
host: nextgen-email.com
class: IN
ttl: 300
type: MX
pri: 10
target: mxa.mailgun.org

Información TXT
host: nextgen-email.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 a mx  include:mailgun.org include:sparkpostmail.com ~all
entries: