Registro DMARC
v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com,mailto:reports@dmarc.cyber.dhs.gov; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Servidores DNS Principal (mname) y Secundario (rname)
host: onlinepostalservice.us
class: IN
ttl: 3600
type: SOA
mname: eagnmnEXMSdns1.usps.gov
rname: domainadmin.imail.usps.gov
serial: 781577249
refresh: 1200
retry: 180
expire: 1209600
minimum-ttl: 3600

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