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

Servidores DNS Principal (mname) y Secundario (rname)
host: fortworthpubliclibrary.org
class: IN
ttl: 900
type: SOA
mname: ns-1254.awsdns-28.org
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: fortworthpubliclibrary.org
class: IN
ttl: 1030
type: TXT
txt: MS=ms70185378
entries: Array

Información TXT
host: fortworthpubliclibrary.org
class: IN
ttl: 1030
type: TXT
txt: v=spf1 -all
entries: Array