4 in 10 emails sent are now being read on a mobile device, says Return Path in a new report, up 300% in the past 2 years alone. In fact, that 38% of email opens in the US now occurring on a mobile device surpasses the share of opens using a webmail account on a browser (31%) and via email desktop clients (also 31%).

via More Emails Being Opened On Mobiles Than Through Browser-Based Webmail.