The Number of Emails Sent Per Day in 2018 (and 20+ Other Email Facts)

Business woman are sending email marketing by digital smart phone
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Statistics, extrapolations, and counts by the Radicati Group in March 2018 estimated the number of email accounts worldwide at 3.8 billion — and the number of consumer and business emails sent per day in 2018 at more than 281 billion. The research firm projects the latter figure to grow to more than 333 billion by 2022.

By contrast, the Radicati Group's estimate for 2015 was 205 billion emails per day, and the estimate for 2009 was 247 billion emails sent per day.

Fascinating Email Facts and Statistics

DMR offers these other fascinating tidbits on email, compiled in August 2015 and updated in 2017:​

  1. The first email system was developed in 1971.
  2. Each day, the average office worker receives 121 emails and sends out 40.
  3. Eighty-six percent of professionals name email as their favorite mode of communication.
  4. Sixty-six percent of email is read on mobile devices.
  5. Percentage of email that is considered spam: 49.7.
  6. Percentage of emails that have a malicious attachment: 2.3.
  7. The top countries for generating spam are the United States, China, and Russia.
  8. Belarus generates the most spam per capita.
  9. The open rate for email sent in North America is 34.1 percent.
  10. The mobile click-to-open rate for U.S. marketing email is 13.7 percent.
  11. The desktop click-to-open rate for U.S. marketing email is 18 percent.
  12. The average open rate for political emails is 22.8 percent.
  13. The average length of subject line for the highest read rate is 61 to 70 characters.
  14. The top day for email volume is Cyber Monday.
  15. Groupon sends the most email per user.
  16. Thirty-three percent of mobile users say they've read an email based on its subject line.
  1. The iPhone is the most popular mobile device for email opens.
  2. The percentage of users who made purchases based upon emails received on their mobile devices is 6.1.
  3. Tuesday is the best day to send an email because more emails are opened on Tuesday than on any other day of the week.