Emily Lane
April 30, 2026

Courier now supports fully isolated custom environments, so teams can build and test customer messaging the same way they ship code. Create environments like dev, staging, QA, or production, configure separate provider integrations and API keys, and keep logs, metrics, templates, journeys, and subscription topics scoped to each environment.
When a message flow is ready, promote templates and dependencies between environments without affecting production. This gives teams safer testing, cleaner collaboration, and more control over how messaging changes move from idea to launch.
Read more about our launch here.
Learn more: Read the Environments and API Keys docs

Send rate limits for providers
Send to Courier at any rate. Courier sends to each provider at the rate you set.
By Emily Lane
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Preference webhooks and change history API
Get every preference change as a webhook, and read the full history by API.
By Emily Lane
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Cross-Device Email Preview
Preview email templates on real devices, 96 clients across 21 apps, right from Design Studio.
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