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: mdanderson.biz
class: IN
ttl: 21600
type: SOA
mname: 1mcinfobloxdns1.mdanderson.edu
rname: hostmaster.mdanderson.org
serial: 3
refresh: 10800
retry: 3600
expire: 2419200
minimum-ttl: 900