Registro DMARC
v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; rua=mailto:dmarc-rua@shortest-route.com;

Servidores DNS Principal (mname) y Secundario (rname)
host: flx1.com
class: IN
ttl: 20558
type: SOA
mname: ns1.shortest-route.com
rname: hostmaster.shortest-route.com
serial: 2025091700
refresh: 7200
retry: 1800
expire: 604800
minimum-ttl: 86400

Servidor de Correo
host: flx1.com
class: IN
ttl: 20558
type: MX
pri: 0
target: 

Información TXT
host: flx1.com
class: IN
ttl: 20558
type: TXT
txt: v=spf1 -all
entries: v=spf1 -all