Environments
Use sandbox for integration testing and production for real recipient traffic.
Sandbox
Sandbox is for validating request shape, authentication, and application flow without risking production sender reputation. It is the right place to test:
- API key wiring.
- Payload generation.
- Error handling.
- Webhook receiver behavior.
- Template rendering.
Sandbox limits and accepted recipients can differ from production. Do not infer deliverability quality from sandbox sends.
Production
Production is for real mail. Before switching traffic to production:
- Verify the sending domain.
- Publish SPF, DKIM, and tracking-domain DNS records.
- Use a production API key stored in a secret manager.
- Enable webhooks.
- Confirm suppression and unsubscribe behavior.
- Start with controlled volume before moving all traffic.