Handling Email API 429 Rate Limits in Logistics: Who Owns the Template?

The article argues that a 429 response from an email API should be treated as a queuing decision rather than a failed send. It recommends durable verification events, honoring the provider's Retry-After header, and retrying with bounded jitter and a defined deadline. A central point is that retry logic controls timing while template ownership controls content, and mixing the two can cause stale or inconsistent emails. For logistics signup verification, the author favors keeping templates in the application repository, since pinning a versioned render keeps retries reproducible, though provider-managed templates suit teams needing faster copy changes.