Registro DMARC
v=DMARC1; p=reject; rua=mailto:dmarc_agg@vali.email,mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com; fo=1

Servidores DNS Principal (mname) y Secundario (rname)
host: landstarcanada.net
class: IN
ttl: 3600
type: SOA
mname: ns69.domaincontrol.com
rname: dns.jomax.net
serial: 2020090202
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 600