We are email geeks here at SMTP2GO (no shame!) and we like to keep an eye on what’s happening in the email industry. The guys over at EmailTooltester are brilliant at researching and collating email statistics and putting them into insightful (fact-checked) reports, packed with fresh data. Here are some highlights from a recent EmailTooltester report (which includes sources).
Email remains one of the most powerful communication tools and its usage continues to grow year after year. In 2025, an estimated 376.4 billion emails will be sent every day, and by 2027, this number will climb to 408.2 billion.
But who’s sending all these emails? And how are users engaging with them? Let’s dive into the latest statistics shaping the future of email.
Email Usage Continues to Rise
- Nearly 4.2 million emails were sent every second worldwide in 2024.
- The global email user base is projected to reach 4.6 billion by 2025 – up from 4 billion in 2020.
- On average, users have 1.86 email accounts, meaning there are roughly 8.3 billion email accounts worldwide.
How Email Sending Has Grown Over the Years
The volume of emails sent each day has steadily increased:
- 2018: 281.1 billion
- 2022: 333.2 billion
- 2025: 376.4 billion (estimated)
- 2027: 408.2 billion (projected)
This consistent growth highlights the continued importance of email as a preferred communication channel across industries.
Email Usage by Country & Device
- The United States leads the way, sending nearly 10 billion emails per day.
- Germany, Ireland, the UK, France, and the Netherlands follow closely behind, each sending over 8 billion emails daily.
- Australia ranks lowest among the top ten, sending 8.1 billion emails per day.
As for devices, mobile remains dominant, with 54% of users checking emails on their smartphones or tablets. However, preferences vary by generation:
- 81% of mobile users favor smartphones for email.
- Millennials and Gen Z overwhelmingly prefer mobile, while baby boomers lean toward desktops.
- 75% of users delete emails that aren’t optimized for mobile viewing.
Spam & Email Deliverability
While legitimate email volume increases, spam remains an issue:
- 160 billion spam emails were sent daily in 2023, accounting for 46% of all email traffic.
- 10.5% of emails end up in spam folders.
- China and the U.S. generate the most spam, each sending 7.8 billion spam emails daily.
Best Time & Day to Send Emails
Timing plays a critical role in email engagement:
- Monday has the highest open rate (51.9%).
- Friday emails drive the best click-through rate (CTR) at 13.58%.
- Sending at 8 p.m. results in the highest open rates (59.46%), followed by 2 p.m. and 11 p.m.
Who says email is dead?! If we can help with your email sending needs, contact us!
