The original title is: "Lint your React Email templates in CI (before Gmail strips half your CSS)"

Short summary

A practical guide to linting React Email templates in CI using the open-source Emailens CLI. The approach compiles templates to static HTML, then runs static analysis against a database of real email client support data to catch issues like unsupported CSS in Outlook, spam signals, and oversized HTML. Includes a complete GitHub Actions workflow and covers refinements like scoped checks and machine-readable JSON output.

• •Compile React Email templates to HTML and lint against real email client support data in CI
• •Catches unsupported CSS, spam signals, accessibility issues, and size limits before deployment
• •Includes complete GitHub Actions workflow with configurable failure thresholds

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