Registro DMARC
v=DMARC1; p=reject; rua=mailto:report@dmarc.amazon.com; ruf=mailto:report@dmarc.amazon.com

Servidores DNS Principal (mname) y Secundario (rname)
host: alexa.net
class: IN
ttl: 21136
type: SOA
mname: ns1.markmonitor.com
rname: hostmaster.markmonitor.com
serial: 2026102701
refresh: 86400
retry: 3600
expire: 2592000
minimum-ttl: 172800

Información TXT
host: alexa.net
class: IN
ttl: 436
type: TXT
txt: v=spf1 -all
entries: v=spf1 -all