Registro DMARC
v=DMARC1; p=reject;

Servidores DNS Principal (mname) y Secundario (rname)
host: ceamedicalmanufacturing.net
class: IN
ttl: 1800
type: SOA
mname: nick.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2357773225
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: ceamedicalmanufacturing.net
class: IN
ttl: 1800
type: MX
pri: 0
target: ceamedicalmanufacturing.net

Información TXT
host: ceamedicalmanufacturing.net
class: IN
ttl: 1800
type: TXT
txt: v=spf1 -all
entries: Array