Registro DMARC
v=DMARC1; p=none; rua=mailto:postmaster@ab.edu

Servidores DNS Principal (mname) y Secundario (rname)
host: ab.edu
class: IN
ttl: 1800
type: SOA
mname: cory.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2415452920
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: ab.edu
class: IN
ttl: 300
type: MX
pri: 0
target: mail.ab.edu

Información TXT
host: ab.edu
class: IN
ttl: 300
type: TXT
txt: v=spf1 mx -all
entries: Array