One-column design and simple calls to action are among the features that e-mail marketers can incorporate to ensure their mobile campaigns offer an optimal viewing experience. Such universally applicable steps are necessary as designing different templates for each of the many devices now on the market becomes impractical. "Break out of the 'mobile template' mindset and focus on developing a library of responsively designed, device-agnostic email templates. As more tablets and smartphones are introduced, your emails will continue to render beautifully. Your designers and customers will thank you," writes Adam Steinberg.