Experian found that emails sent between 8pm and 12am generated higher open and clickthrough rates, more transactions, larger orders, and greater revenue per email than emails sent during any other time of day—and by a significant margin. The advantage of nighttime sends in revenue per email was especially noticeable: Emails sent between the evening time slot averaged a return of 48 cents per email, more than triple the overall average of 14 cents per email. The next best-performing time slot was even later: from 12am to 4am; those emails only generated 22 cents per email on average, while the least lucrative time to send was between 12pm and 4pm, when senders only averaged a return of 15 cents per email. Just as senders benefited from off times, so too did they benefit from sending on off days of the week. Opens and clickthroughs 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. Get the full story at eMarketer