Registro DMARC
v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@bit.ly; ruf=mailto:ruf@dmarc.bitly.net; fo=1;

Servidores DNS Principal (mname) y Secundario (rname)
host: bitly.ws
class: IN
ttl: 900
type: SOA
mname: ns-207.awsdns-25.com
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: bitly.ws
class: IN
ttl: 3600
type: TXT
txt: v=spf1 -all
entries: Array