How to lint React Email templates in CI to catch email client CSS failures early

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Frontend developers building email templates with React Email often discover CSS compatibility issues only after users report broken rendering in clients like Gmail or Outlook. A new open-source tool called Emailens offers a static analysis approach, scanning compiled HTML output against a database of email client support data to flag unsupported CSS properties, accessibility issues, spam signals, and oversized templates. The workflow involves exporting React Email templates to plain HTML using the react-email CLI, then running the Emailens linter against those files as a CI step on pull requests. Unlike render-testing services such as Litmus, this linting approach runs in seconds at no per-test cost, catching the majority of common breakage before code is merged. The tool integrates with GitHub Actions and returns standard exit codes, allowing teams to fail pull requests automatically when incompatible CSS is introduced.

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