Registro DMARC
v=DMARC1; p=quarantine; pct=100;

Servidores DNS Principal (mname) y Secundario (rname)
host: xentap.com
class: IN
ttl: 21600
type: SOA
mname: dns1.cscdns.net
rname: hostmaster.cscdns.net
serial: 2018112704
refresh: 10800
retry: 3600
expire: 2592000
minimum-ttl: 86400

Información TXT
host: xentap.com
class: IN
ttl: 21600
type: TXT
txt: v=spf1 -all
entries: Array