Designing your emails to be mobile-friendly is becoming increasingly important. The percentage of email messages opened on mobile devices is already in the 50% range and is increasing each year. In a statistic published by TopRank Blog, 64% of decision-makers read their email via mobile devices.
Taking these statistics into consideration, it’s clear your email should be readable on a mobile device. The best way to accomplish this is to create responsive emails. With responsive design, the content “responds” to the size of the viewport by expanding or shrinking to the appropriate size.
For example, when viewing a responsive email on your desktop you may see a two-column layout. If you then view the same email on your mobile device, the content may be shifted into one-column. The content is the same, just presented differently based on the dimensions of the viewport.