Registro DMARC
v=DMARC1; p=reject;

Servidores DNS Principal (mname) y Secundario (rname)
host: 3amlabs.org
class: IN
ttl: 3600
type: SOA
mname: ns1.getgo.com
rname: noc.logmein.com
serial: 461508447
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 3600