Read this study online at: http://mailchimp.com/resources/guides/email-on-mobile-devices/
This study will help you understand how to optimize your content for the best readability on mobile devices. Learn all about how people read email on their smartphones, and then start creating beautiful, easier to read emails that are less likely to get filtered or deleted on a mobile device.
More than 20 pages of written and visual research about how people read email on mobile devices. Topics include:
Behaviors around mobile email
Best practices for mobile email
Designing for mobile
Video excerpts from our research