Registro DMARC
v=DMARC1;p=reject;rua=mailto:ckaiqst3@ag.dmarcian.com

Servidores DNS Principal (mname) y Secundario (rname)
host: Io.uk
class: IN
ttl: 21600
type: SOA
mname: nusdnsgm01.ironmountain.com
rname: webmaster.ironmountain.com
serial: 9
refresh: 10800
retry: 3600
expire: 2592000
minimum-ttl: 900

Información TXT
host: Io.uk
class: IN
ttl: 21600
type: TXT
txt: v=spf1 -all
entries: Array