1. Design and Code Your Email: Start with a responsive design using best practices. 2. Test in a Single Client First: Ensure it looks good in at least one client. 3. Use Testing Tools: Run your email through tools like Litmus to see how it appears in different clients. 4. Fix Issues: Address any discrepancies or issues identified during testing. 5. Retest: After making changes, run the tests again to ensure all issues are resolved.