Registro DMARC
v=spf1 mx include:emailserver.vn -all

Registro IPv4
host: hieuhoc.com.vn
class: IN
ttl: 3600
type: A
ip: 202.92.7.103

Servidores DNS Principal (mname) y Secundario (rname)
host: hieuhoc.com.vn
class: IN
ttl: 3600
type: SOA
mname: ns1.matbao.vn
rname: admin.matbao.com
serial: 2021020501
refresh: 7200
retry: 1800
expire: 1209600
minimum-ttl: 3600

Servidor de Correo
host: hieuhoc.com.vn
class: IN
ttl: 3600
type: MX
pri: 10
target: host03.emailserver.vn

Información TXT
host: hieuhoc.com.vn
class: IN
ttl: 3600
type: TXT
txt: v=spf1 mx include:emailserver.vn -all
entries: Array