Registro DMARC
v=DMARC1; p=none;

Servidores DNS Principal (mname) y Secundario (rname)
host: 51uc.com
class: IN
ttl: 600
type: SOA
mname: ns1.sina.com.cn
rname: zhihao.staff.sina.com.cn
serial: 20050313
refresh: 3600
retry: 900
expire: 604800
minimum-ttl: 600

Servidor de Correo
host: 51uc.com
class: IN
ttl: 90
type: MX
pri: 10
target: freemx1.sinamail.sina.com.cn

Información TXT
host: 51uc.com
class: IN
ttl: 90
type: TXT
txt: v=spf1 include:spf.sinamail.sina.com.cn -all
entries: Array