Testing
SendGrid and AWS SES both offer sandbox modes for testing without sending real emails. Beyond sandbox, you need to test delivery event webhooks (bounce, complaint, open, click) and mock the SDK in unit tests. This guide covers the full testing stack for both providers. What Transactional Email Testing Covers Testing
Testing
SendGrid powers email delivery for many production applications. Testing SendGrid integration involves mocking the API client for unit tests, using SendGrid's sandbox mode for integration tests, and testing Event Webhooks for delivery tracking. This guide covers all three layers with Node.js examples. Key Takeaways Enable sandbox mode
Testing
SendGrid provides a sandbox mode that validates emails without sending them, dynamic templates you can test independently, and event webhooks for tracking delivery status. This guide covers testing SendGrid integrations at every level: sandbox validation, template rendering, webhook handling, and deliverability simulation. Email bugs are subtle and slow to surface.