Email open rates fell to 17% on average in 2010, down 9 percentage points from 26% in 2009, according to a report by Harte-Hanks.The pharmaceutical and government sectors recorded the highest open rates during the year, whereas the tech sector recorded the lowest. Below, other findings from the Harte-Hanks Postfuture Index 2009-2010, which examined metrics for roughly 3 billion email messages sent