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

Registro IPv4
host: gcp-proxy.teachable.cloud
class: IN
ttl: 300
type: A
ip: 34.54.192.65

host: Herworld-S-School.teachable.com
class: IN
ttl: 90
type: CNAME
target: gcp-proxy.teachable.cloud