Optimizing emails for mobile devices involves several key steps: - Responsive Design: Ensure that your email layout adjusts smoothly to different screen sizes. - Short Subject Lines: Mobile screens show fewer characters, so keep subject lines concise and to the point. - Single Column Layout: Simplify your design to a single column to make it more readable on a small screen. - Larger Font Sizes: Use larger fonts for better readability. - Clickable Buttons: Ensure that buttons are large enough to be easily tapped with a finger.