Registro DMARC
v=spf1 a mx include:mailgun.org ?all

Registro IPv4
host: mary.nl
class: IN
ttl: 3600
type: A
ip: 149.210.150.3

Servidores DNS Principal (mname) y Secundario (rname)
host: mary.nl
class: IN
ttl: 86400
type: SOA
mname: ns1.namecommander.com
rname: dns.namecommander.com
serial: 2018080302
refresh: 1800
retry: 3600
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: mary.nl
class: IN
ttl: 3600
type: MX
pri: 10
target: smtp.blackhole.nl

Información TXT
host: mary.nl
class: IN
ttl: 3600
type: TXT
txt: v=spf1 a mx include:mailgun.org ?all
entries: Array