curl -s --user 'api:PRIVATE' \
https://api.mailgun.net/v3/lists/subscribers@mail.bercostudio.com/validate
curl -s --user 'api:api-key' \
https://api.mailgun.net/v3/mail.bercostudio.com/messages \
-F from='Berco Studio <info@bercostudio.com>' \
-F to='subscribers@mail.bercostudio.com' \
-F subject='Greetings 2 from Berco Studio Ltd.' \
-F template='newsletter' \
-F h:X-Mailgun-Variables='{"test": "test"}'
# Send an email using your active template with the above snippet
# You can see a record of this email in your logs: https://app.mailgun.com/app/logs.