Registro DMARC
v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; pct=100

Servidores DNS Principal (mname) y Secundario (rname)
host: 77tracking.com
class: IN
ttl: 300
type: SOA
mname: ns.rackspace.com
rname: hostmaster.rackspace.com
serial: 1779105439
refresh: 3600
retry: 300
expire: 1814400
minimum-ttl: 300

Información TXT
host: 77tracking.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 -all
entries: