Fonts and CSS can also contribute to email file size. Here's how to optimize them:
Limit Font Use: Stick to web-safe fonts like Arial, Verdana, and Times New Roman. If you must use custom fonts, host them externally and link to them. Minify CSS: Remove unnecessary spaces and comments from your CSS. Tools like CSSNano can help with this. Inline CSS: Use inline CSS instead of external stylesheets to reduce the number of HTTP requests.