Registro DMARC
v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Servidores DNS Principal (mname) y Secundario (rname)
host: squishthephish.org
class: IN
ttl: 300
type: SOA
mname: dns2.p07.nsone.net
rname: domainadmin.firstdata.com
serial: 728020813
refresh: 1200
retry: 180
expire: 604800
minimum-ttl: 300

Información TXT
host: squishthephish.org
class: IN
ttl: 300
type: TXT
txt: v=spf1 -all
entries: v=spf1 -all