Registro DMARC
v=DMARC1;p=quarantine;pct=15;rua=mailto:dmarc@tuningprojects.com

Servidores DNS Principal (mname) y Secundario (rname)
host: tuningprojects.com
class: IN
ttl: 1800
type: SOA
mname: elisabeth.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2343476511
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: tuningprojects.com
class: IN
ttl: 300
type: MX
pri: 10
target: smtp-relay-node.tuningprojects.com