Registro DMARC
v=DMARC1;p=quarantine;rua=mailto:dmarc@email.xiaoxiaobai.cn

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: 2374597180
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: ab.edu
class: IN
ttl: 300
type: MX
pri: 0
target: a.sy6.net

Información TXT
host: ab.edu
class: IN
ttl: 300
type: TXT
txt: v=spf1 a mx ip4:141.98.196.221 ~all
entries: Array