Registro DMARC
v=DMARC1; p=reject; rua=mailto:usrbp-t@dmarc.report-uri.com

Servidores DNS Principal (mname) y Secundario (rname)
host: onlinesra.com
class: IN
ttl: 1800
type: SOA
mname: ivan.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2376617313
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Servidor de Correo
host: onlinesra.com
class: IN
ttl: 300
type: MX
pri: 0
target: 

Información TXT
host: onlinesra.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 -all
entries: Array

Información TXT
host: onlinesra.com
class: IN
ttl: 300
type: TXT
txt: v=DKIM1; p=
entries: Array