Optimizing emails for iOS Mail involves multiple factors: Responsive Design: Use media queries and flexible grids to ensure your email looks good on various screen sizes. Load Time: Ensure images and other assets load quickly by compressing them and using efficient coding practices. Font Sizes: Use larger font sizes for better legibility on smaller screens. Apple recommends a minimum of 14px. Clickable Links: Ensure that all links and buttons are easily tappable, with sufficient padding.