Increasing your results with email marketing often includes testing and tracking analytics. Heather Vale Goss of Performance Marketing Insider interviews Senior Manager of Optimization and Strategy, Taylor Kennedy, and Optimization Manager Lauren Pitchford from MECLABS. In this interview, part two of four, find out what visual elements you should include in your emails, how many images and graphics you should use, how mobile affects your email marketing strategy, and what kind of call to action works best. Also discover how much testing you should at bare minimum, and what is optimal, along with specific testing strategies that work.