Registro DMARC
v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com ;ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Servidores DNS Principal (mname) y Secundario (rname)
host: slmmc.org
class: IN
ttl: 1800
type: SOA
mname: dave.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2356776713
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: slmmc.org
class: IN
ttl: 300
type: MX
pri: 0
target: 

Información TXT
host: slmmc.org
class: IN
ttl: 300
type: TXT
txt: v=spf1 -all
entries: Array