Responsive Design: Ensuring your email is mobile-friendly is non-negotiable. Responsive design adapts the email layout to fit the screen size of the device, making it readable and visually appealing on desktops, mobiles, and tablets.
Text Size and Button Placement: On mobile devices, a larger text size is essential for readability, and buttons should be large enough to tap easily. On desktops, you have more screen real estate to work with, allowing for more detailed images and longer text.