Registro DMARC
v=DMARC1; p=none;

Servidores DNS Principal (mname) y Secundario (rname)
host: usastemclubs.com
class: IN
ttl: 75066
type: SOA
mname: ns1074.ui-dns.com
rname: hostmaster.1and1.com
serial: 2017072406
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 300

Servidor de Correo
host: usastemclubs.com
class: IN
ttl: 3600
type: MX
pri: 10
target: mx00.ionos.com

Servidor de Correo
host: usastemclubs.com
class: IN
ttl: 3600
type: MX
pri: 10
target: mx01.ionos.com

Información TXT
host: usastemclubs.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:_spf-us.ionos.com ~all
entries: Array