Registro DMARC
v=DMARC1; p=quarantine;

Servidores DNS Principal (mname) y Secundario (rname)
host: e-sm.com.mx
class: IN
ttl: 900
type: SOA
mname: ns1.grupo-sm.net
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400

Información TXT
host: e-sm.com.mx
class: IN
ttl: 343
type: TXT
txt: v=spf1 include:spf.protection.outlook.com include:amazonses.com ~all
entries: