React Email 4.0

React Email 4.0 introduces several new features and improvements designed to enhance the email development experience. The built-in Linter tool analyzes email links to ensure they are valid and secure, and checks images for optimization and accessibility. The Spam Score feature, powered by SpamAssassin, evaluates email content for common spam indicators, such as suspicious words and excessive URLs.

The Compatibility Checker, utilizing the "Can I Email" repository, assesses HTML/CSS support across various email clients, ensuring broad compatibility. The Responsive Preview feature allows users to see how their emails will appear on different devices, with customizable presets for mobile and desktop views.

Additionally, React Email 4.0 includes eight new components, such as Bento Grids, Pricing Tables, Feature Lists, and Ratings, which can be easily integrated into emails. The package update is straightforward, with instructions provided for upgrading to the latest version.