Registro DMARC
v=DMARC1; p=reject; pct=100; sp=reject; rua=mailto:8ce08d30@inbox.ondmarc.com; ruf=mailto:8ce08d30@inbox.ondmarc.com; adkim=r; aspf=r; fo=1; rf=afrf; ri=3600

Servidores DNS Principal (mname) y Secundario (rname)
host: sifmaonline.org
class: IN
ttl: 1800
type: SOA
mname: kara.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2377036813
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800