To check the formatting of your email, consider the following steps:
Preview the email in different email clients (e.g., Gmail, Outlook) to ensure consistency. Use responsive design to make sure the email looks good on both desktop and mobile devices. Check for broken links and make sure all links lead to the correct pages. Ensure that images have alt text for accessibility and if images fail to load. Test the email with various screen readers to ensure accessibility for visually impaired users. Use an email testing tool to preview the email's appearance and functionality.