Studies of when people open and click though emails have been conducted. From study to study and year to year, the days when people opened and clicked through links are spread over the seven days of the week. And for the most part, the best day for getting email messages opened differs from the best day for people clicking through on links. A Gallup poll found that consumers spend more on Fridays and Saturdays than other days of the week: $73 and $76$ versus $58 on average on other weekdays. What’s to be learned from this is that the results you get from your mailing may relate to the people on your list or be related to factors other than the day of mailing, such as if you have a book related to a season or an occasion, or the approach of winter when many people read more. Think of paydays as a time to send email, too.
The time of day you send your email may be as important to getting your email read. One of the values of using an email service is that you can see when people opened your email. Then you can send it to them at that time of day. Until you get some feedback from when people open your list, send them to them for the time they arrive after work. My partner and wife, Sarah, author of Sitting With The Enemy who is working on the last chapter of a free sequel that is available on her website, have noticed in our mountain village that this is when web traffic is highest. However, if you want to reach readers at their businesses, there’s research showing email is more likely to be opened midweek shortly after people arrive at work or after lunch.