Return Path also found that there is an uptick in mobile email readership during the weekend, which can be attributed to email recipients switching from the desktop to a smartphone outside of office hours. Conversely, it’s at its lowest on a Wednesday, when presumably folks are at their most busy tackling their Outlook, or OSX Mail inboxes.
The implications for email senders like you and I are fairly clear. As Tom at Return Path states in his summary:
“… those that aren’t tracking which device their subscribers are reading their emails on, or optimizing their emails or websites for mobile devices stand to lose out. A poor user experience could mean no response, no action, or plainly put, no ROI.”