Registro DMARC
v=DMARC1; p=reject; fo=1; ri=3600; rua=mailto:dmarc_rua@emaildefense.proofpoint.com;

Servidores DNS Principal (mname) y Secundario (rname)
host: lido-brf.net
class: IN
ttl: 811
type: SOA
mname: udns1.cscudns.com
rname: hostmaster.cscdns.net
serial: 2019102616
refresh: 28800
retry: 7200
expire: 1209600
minimum-ttl: 86400