To create mobile-optimized emails, focus on these key elements: - Responsive Design: Use [responsive design](https://) techniques to ensure your emails adapt to various screen sizes. - Font Size and Line Spacing: Use larger fonts (at least 14px) and adequate line spacing for better readability. - Single-Column Layouts: Simplify your layout to a single column to avoid horizontal scrolling. - Optimized Images: Compress images to reduce load times and ensure they scale correctly. - Clear Call-to-Actions (CTAs): Make CTAs prominent and easy to tap with a thumb.