Multivariate testing is more complex and involves testing multiple variables at once. Here's how to do it: 1. Identify Variables: Choose the elements you want to test, such as subject line, images, and CTA. 2. Create Multiple Versions: Develop different combinations of emails with varied elements. 3. Segment Your Audience: Divide your email list into multiple segments, each receiving a different version. 4. Send and Monitor: Distribute the emails and monitor performance metrics over time. 5. Analyze Data: Use statistical analysis to determine which combination of elements performs best.