Registro DMARC
v=spf1 include:mailgun.org ~all

Registro IPv4
host: gcp-proxy.teachable.cloud
class: IN
ttl: 164
type: A
ip: 34.54.192.65

host: gusti-anom-s-school.teachable.com
class: IN
ttl: 90
type: CNAME
target: gcp-proxy.teachable.cloud