Registro DMARC
v=spf1 a:%{i}.secured.%{h} include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email redirect=%{h} ~all

Servidores DNS Principal (mname) y Secundario (rname)
host: 5minutewebsites.net
class: IN
ttl: 3601
type: SOA
mname: dns1.registrar-servers.com
rname: hostmaster.registrar-servers.com
serial: 1738170933
refresh: 43200
retry: 3600
expire: 604800
minimum-ttl: 3601