Registro DMARC
v=DMARC1;p=none;

Servidores DNS Principal (mname) y Secundario (rname)
host: cful.org
class: IN
ttl: 1800
type: SOA
mname: ns10.nationbuilder.com
rname: dns.cloudflare.com
serial: 2415488114
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: cful.org
class: IN
ttl: 90
type: MX
pri: 0
target: cful-org.mail.protection.outlook.com

Información TXT
host: cful.org
class: IN
ttl: 90
type: TXT
txt: v=spf1 a mx include:sendgrid.net ~all
entries: Array