- Audit Your Code: Regularly review and audit your HTML code for any errors or outdated practices. - Use Email Templates: Utilize pre-tested, reliable email templates that are known to render well across different platforms. - Stay Updated: Keep up-to-date with the latest email marketing and coding practices to ensure your emails are always optimized. - Professional Help: If HTML coding is not your strong suit, consider hiring a professional or using an email service provider (ESP) with robust design tools.