Experian-Email-Volume-Growth-Trends-Q2-2012-Q2-2013-Sept2013The average email subscriber gets 416 commercial messages per month, says Return Path, and that number may just get higher. The latest quarterly email benchmark study [download page] from Experian Marketing Services indicates that email volume grew by 17.9% year-over-year in Q2. That follows an 11.6% increase in Q1, a relatively modest 5.4% bump in Q4, and no change in Q3 2012. Open rates don’t seem to have suffered, though, with total and unique open rates up year-over-year during Q2.