Email open rates continue to trend upwards, rising to 26.2% in Q1 2012, representing 5.6% growth from 24.8% in Q4 2011 and a 12.4% year-over-year increase, per an Epsilon report [download page] released in June 2012. Click rates, though, moved in the opposite direction, falling to a low of 4.7%, down 8.3% from last quarter, and 19.3% from Q1 2011. Non-bounce rates remained strong at 96.5%, while average volume per client decreased by 23.9% over Q4 2011, unsurprising given historical spikes during the holiday season. Even so, average volume per client did demonstrate 21.4% growth from Q1 2011. Read the rest at MarketingCharts.