curl --request PUT \
  --url 'https://api.usedatabrain.com/api/v2/data-app/smtp-settings' \
  --header 'Authorization: Bearer dbn_live_abc123...' \
  --header 'Content-Type: application/json' \
  --data '{
    "host": "smtp.example.com",
    "port": 587,
    "username": "smtp-user",
    "password": "your-password",
    "fromAddress": "noreply@example.com",
    "replyToAddress": "support@example.com",
    "secure": false
  }'

{
  "data": {
    "success": true
  }
}