Just as senders benefited from off times, so too did they benefit from sending on off days of the week. Opens and click-throughs were highest on Saturdays and Sundays, Experian found. Saturday was the day that found the most recipients in a buying mood: The transaction rate that day was .16%, compared with .11% overall. This contributed to Saturday being the send day with the best return on investment (ROI)—20 cents per email. Read the rest at eMarketer.