Registro DMARC
v=DMARC1; p=none; rua=mailto:dmarc@dkent.net; fo=1

Servidores DNS Principal (mname) y Secundario (rname)
host: expressairatl.com
class: IN
ttl: 1800
type: SOA
mname: deb.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2383514656
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800