Inlining CSS One of the most effective ways to optimize CSS for email is by inlining it. This means placing the CSS styles directly within the HTML elements rather than using external or internal style sheets. Inlined CSS ensures that your styles are applied consistently across various email clients, many of which strip out internal and external styles.
Minifying CSS Minifying CSS involves removing unnecessary characters, such as spaces, comments, and line breaks, from your CSS code. Tools like CSSNano and CleanCSS can help you automate this process, making your CSS files smaller and faster to load.
Using Email-Safe Fonts Not all fonts are supported by every email client. Stick to email-safe fonts like Arial, Times New Roman, and Verdana to ensure consistent rendering across different platforms. If you must use custom fonts, provide fallback options.