I recently tuned into a really great webinar presented by Yesmail. Titled “Mobile Email Design: Differences Between Responsive & Mobile Scalable Email Design,” the presentation documents the differences between scalable and responsive design and how to determine which is right for you. With the increase of mobile opens (123% in 18 months!), it’s crucial to start thinking about which mobile strategy is right for you. Yesmail discusses two very prominent mobile optimization techniques in their webinar, which I’ve summarized below.