Registro DMARC
v=DMARC1;p=reject;pct=100;fo=1;ri=86400;rua=mailto:dmarc_rua@emaildefense.proofpoint.com;ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Servidores DNS Principal (mname) y Secundario (rname)
host: pnb-principal.com
class: IN
ttl: 3600
type: SOA
mname: ns1.principal.com
rname: dns.principal.com
serial: 4
refresh: 21600
retry: 3600
expire: 172800
minimum-ttl: 3600

Información TXT
host: pnb-principal.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 -all
entries: Array