css-compatibility

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emailens / engine

The rendering linter for email, in your terminal and CI. HTML, react.email, mjml and maizzle checked against 255 CSS and HTML features across 21 clients, with file:line positions and exit codes. Offline, no account.

css accessibility email gmail compatibility outlook mjml spam-detection dark-mode email-client html-email email-testing react-email css-compatibility spam-check

Updated Sep 26, 2026
TypeScript

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