As of February 2017, there were 3.7 billion users of email services worldwide, and every day 269 billion emails are sent. Broken down, this equates to 2.5 million emails sent every second and trillions of emails sent each year. An estimated 49.7% of all emails are spam messages, and the average person who works in an office receives over 120 emails each day. The email system has been around since 1971, and the highest open rates of email take place on Saturdays. Out of all the companies that send emails to users, Groupon is the company that sends the most emails per user. Only 22.8% of people open political emails, while between 13 and 18% of marketing emails are opened in the United States. The day on which the most email volume is sent is Cyber Monday, the unofficial busiest online shopping day of the year. Only 7.3% of emails are opened on a tablet, while over 55% are opened on a computer. The least effective days to send emails are Wednesday and Friday, and the highest read rate of emails originates in emails with subject lines between 61 and 70 characters.
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