Registro DMARC
v=DMARC1; p=reject; sp=reject;

Servidores DNS Principal (mname) y Secundario (rname)
host: guangzhengedu.com
class: IN
ttl: 1800
type: SOA
mname: neil.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2405543599
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: guangzhengedu.com
class: IN
ttl: 300
type: MX
pri: 1
target: smtp.google.com

Información TXT
host: guangzhengedu.com
class: IN
ttl: 300
type: TXT
txt: google-site-verification=RD7ec_ceeZ4WKLmtxVEQiUMyP49pQ6DFtbj3OSQTJ4o
entries: Array

Información TXT
host: guangzhengedu.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 include:_spf.google.com -all
entries: Array