increasing the font size (over 16pt) to make the content easier to read is a best practice for improving the accessibility of email design. Larger fonts can help users with low vision or cognitive disabilities to access the email content more easily. Reducing line spacing to fit more content on the screen and reduce scrolling is not a good practice for accessibility, as it can make the text harder to read and follow. Removing role="presentation" from layout tables is also not a good practice for accessibility, as it can cause assistive technologies to ignore the table structure and read the content in an incorrect order.