This article on Litmus stresses the importance of mobile responsive emails. If your customers cannot easily read your emails wherever they may be, they are likely to just delete them.
We can’t say it enough—if your emails aren’t easy to read and interact with, your subscribers are likely to abandon them. Regardless of what the industry open trends are, it’s your subscribers’ data that matters most. Where are they opening your emails? Where should you be focusing your testing efforts? How can you provide them with the best email experience possible?
Working with customer engagement agency The Lacek Group, Starwood Preferred Guest began looking at their subscriber open data to determine how to optimize their emails for their audience.
The article includes examples of responsive emails.