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Number of e-mail users worldwide 2017-2025

Despite the growth and prominence of mobile messengers and chat apps, e-mail is an integral part of daily online life. In 2020, the number of global e-mail users amounted to four billion and is set to grow to 4.6 billion users in 2025.

Global e-mail audiences

In 2020, approximately 306 billion e-mails were sent and received every day worldwide. This figure is projected to increase to over 376 billion daily e-mails in 2025. Recent industry data shows that the trend towards mobile also holds true for e-mail: in December 2018, 43 percent of e-mail opens were via mobile. Desktop e-mail clients’ open share had declined to 18 percent, and webmail accounted for 39 percent of opens. Based on the dominance of mobile, it is no surprise that the iPhone e-mail app was the most popular e-mail client, accounting for 29 percent of e-mail opens. Gmail was ranked second with a 27 percent open share. Gmail is a free e-mail service owned by Google, and the company reported 1.5 billion active Gmail users worldwide in October 2018.

Malicious mail

Many online users use e-mails for website and newsletter signups and brace themselves for the inevitable flood of spam and marketing communications. Whereas most unwanted e-mails are annoying yet ultimately benign, consumers are right to be wary of malicious e-mail that can be used to compromise their digital accounts and devices. Overall, consumers are pretty aware of the dangers of unknown e-mails and according to a global survey in February 2019, 45 percent of internet users reported that they avoided opening e-mails from unknown e-mail addresses.

Number of e-mail users worldwide from 2017 to 2025

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Release date

February 2021


United States

Survey time period

2017 to 2025

Supplementary notes

* Forecast
2017 to 2020 data from previous publications

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Statistics on "E-mail usage in the United States"

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