Registro DMARC
v=DMARC1; p=quarantine; sp=none; rua=mailto:info@b21socialmarketing.com

Registro IPv4
host: b21socialmarketing.com
class: IN
ttl: 300
type: A
ip: 87.251.85.139

Servidores DNS Principal (mname) y Secundario (rname)
host: b21socialmarketing.com
class: IN
ttl: 1800
type: SOA
mname: graham.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2354822553
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: b21socialmarketing.com
class: IN
ttl: 300
type: MX
pri: 10
target: mail.b21socialmarketing.com

Servidor de Correo
host: b21socialmarketing.com
class: IN
ttl: 300
type: MX
pri: 20
target: mail.b21socialmarketing.com

Información TXT
host: b21socialmarketing.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 a mx ip4:87.251.85.139 ~all
entries: Array