Registro DMARC
v=spf1 -all

Servidores DNS Principal (mname) y Secundario (rname)
host: callison-rtkl.net
class: IN
ttl: 7200
type: SOA
mname: NS91.WORLDNIC.COM
rname: namehost.WORLDNIC.COM
serial: 123021716
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600

Información TXT
host: callison-rtkl.net
class: IN
ttl: 43200
type: TXT
txt: v=spf1 -all
entries: Array