This document discusses responsive email design (RED) for various screen sizes. It notes that 41% of emails were opened on mobile in the second half of 2012 and that number will exceed 50% by the end of 2013. It addresses designing for the "bijillion" screens including smartphones, tablets and desktops. The key aspects of responsive design discussed are fluid grids, fluid media, and media queries. Breakpoints and techniques like stacking and shifting navigation are presented. Considerations for touch, images, and performance on mobile and tablets are also covered. Testing on real devices is recommended for evaluating touch ergonomics, debugging, and performance.
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