Thanh Nguyen 5/19/2025

Email System Migration: From HTML Hell to React Email with Zero Downtime

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This article details a real-world migration of a payment platform's email system from legacy HTML strings to React Email components, achieving zero downtime. It covers the pain points of old templates, evaluation of alternatives like Handlebars and MJML, and the implementation of a Strategy Pattern to support legacy, provider, and component strategies simultaneously. The author shares pitfalls, testing approaches, and results, making it a practical guide for developers handling similar migrations in production environments.

Email System Migration: From HTML Hell to React Email with Zero Downtime

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