Implementing a fallback mechanism involves several steps:
Know Your Audience: Understand the email clients and devices your audience uses most frequently. Test Extensively: Use tools like Litmus or Email on Acid to test how your emails render across different clients and devices. Use Conditional Statements: Use conditional HTML statements to provide different content for different email clients. Optimize for Mobile: Ensure your fallback mechanisms work well on mobile devices, as a significant portion of email opens occur on mobile.