Email Volume Growth Trends, Q2 2012-Q1 2014 [CHART]

The Experian data also indicates that mobile only accounted for one-third of email opens and 14% of clicks for publishers. Its influence was larger in the consumer products and services (58% of opens; 47% of clicks) and media and entertainment (54% of opens; 50% of clicks) industries.

Separately, the study indicates that brands sent 15.6% more emails overall in Q1 2014 than they did in Q1 2013, representing the 5th consecutive quarter of double-digit increases. Interestingly, open rates continued to rise, with the total open rate increasing from 24.4% in Q1 2013 to 25.5% in Q1 2014. That marks the 5th consecutive quarter that open rates have risen on a year-over-year basis, even as email volume has also grown. Read the rest at MarketingCharts.