Read time: 11 min | Last updated: August 2026
Email statistics get recycled endlessly, and most compilations quote each other rather than the underlying research. That's how a projection from 2015 still circulates as a "current" figure. This page does it differently: every number below is attributed to a named primary source with its publication year, older canonical figures are explicitly flagged as such, and the page is reviewed annually. A companion page covers meeting statistics.
The Key Numbers
| Statistic | Figure | Source (year) |
|---|---|---|
| Emails sent and received per day worldwide | 361.6 billion | Radicati Group (2024) |
| Projected daily email volume by 2028 | 424.2 billion | Radicati Group (2024) |
| Email users worldwide | 4.4+ billion | Radicati Group (2024) |
| Emails the average employee receives per workday | 117 | Microsoft telemetry (2025) |
| Workplace interruptions per day (meetings, email, chats) | 275 | Microsoft telemetry (2025) |
| Share of global email traffic that is spam | 44.99% | Kaspersky (2025) |
| Most common email reply time | 2 minutes | USC/Yahoo Labs (2015) |
| Share of email opens on Apple + Gmail clients | ~90% | Litmus (2026) |
| Knowledge workers using generative AI at work | 75% | Microsoft & LinkedIn (2024) |
| Weekly email-reading time saved by AI assistance (RCT) | ~30 minutes | Microsoft Research (2025) |
How Many Emails Are Sent Per Day?
An estimated 361.6 billion emails were sent and received per day worldwide in 2024, and daily volume is forecast to reach 424.2 billion by 2028, according to the Radicati Group's Email Statistics Report 2024–2028, the canonical source for global email volume. The report's year-by-year path runs through 376.4 billion daily emails in 2025 and 392.5 billion in 2026, roughly 4% growth per year.
The same report counts more than 4.4 billion email users worldwide in 2024, growing to over 4.9 billion by 2028, which works out to more than half the world's population. For all the attention newer channels receive, email remains the largest communication network ever built, and it is still growing.
How Many Emails Does the Average Person Receive?
The average employee receives 117 emails per workday, according to Microsoft's 2025 "Breaking Down the Infinite Workday" report, which draws on aggregated Microsoft 365 telemetry rather than self-reported surveys. The same telemetry counts another 153 Teams messages received per person each weekday alongside that email load.
The shape of that inbox is shifting as well as growing. Microsoft's data shows mass emails sent to twenty or more recipients rose 7% year over year, while one-on-one threads declined 5%. Inboxes are filling with broadcast noise faster than with conversation.
A note on an older figure you may have seen: the widely quoted "126 business emails per day" originates in a 2015 Radicati report's projection for 2019 (counting sent and received combined per business user), though blogs routinely present it as a current received-mail figure. Microsoft's 2025 telemetry figure of 117 is the better number to cite today.
How Much Time Do We Spend on Email?
The most cited figure comes from the McKinsey Global Institute's 2012 Social Economy report: interaction workers spend an estimated 28% of the workweek, about 13 hours, managing email. The figure is old, but no comparably rigorous replacement has been published, which is why it persists.
More recent behavioral data suggests the burden hasn't eased so much as spread across the day. In Adobe's 2019 email usage study, US adults self-reported spending nearly six hours per weekday on email: about three and a half hours on work email and over two more on personal accounts. And Microsoft's 2025 telemetry shows the workday now starts in the inbox: 40% of employees who are online at 6 a.m. are already reviewing email to prioritize their day, and most incoming emails get skimmed in under 60 seconds each.
If you want to see what your own numbers look like, our free email time calculator turns your daily volume into an annual hours-and-cost estimate.
Email Overload and Attention
The clearest measure of modern communication load comes from Microsoft's 2025 telemetry: employees are interrupted every two minutes during core work hours, 275 times a day, by meetings, emails, and chats. Nearly one in three surveyed workers said the pace of work over the past five years has become impossible to keep up with, and 48% described their work as chaotic and fragmented. The workweek no longer ends cleanly either: nearly 20% of employees who work weekends check email before noon on Saturday and Sunday.
Attention research explains why this volume hurts more than its raw hours suggest. Gloria Mark's research at UC Irvine measured the average attention span on any single screen at 47 seconds, down from about two and a half minutes in 2004. Her early observational fieldwork found that interrupted work goes unresumed for an average of 23 minutes and 15 seconds. That figure comes from her mid-2000s studies, reported in a 2006 Gallup interview, and it is one of the most mis-cited numbers on the internet, routinely attributed to later papers that never contained it. Her 2016 workplace logging study with Microsoft Research found the 40 workers tracked checked email an average of 77 times a day, the heaviest checker more than 400 times.
Mark's most striking finding came from simply taking email away. In a small but influential 2012 study in which 13 workers went five days without email, participants switched screens about half as often (18 versus 37 times per hour), and their heart rates shifted from a steady "high alert" pattern to more natural variability. Email load isn't just a time problem; it's a physiological one. Our guide to email overload covers the root causes and what actually fixes them.
How Fast Do People Actually Reply?
The largest study of email behavior ever conducted, USC and Yahoo Labs' 2015 analysis of 16 billion emails exchanged by 2 million users, found the most common reply time is just two minutes, and half of all replies arrive within about 47 minutes. Only a small minority of replies come after more than a day.
Expectations have kept pace with that speed. In Toister Performance Solutions' 2018 surveys, 41% of people expect coworkers to answer internal email within one hour, and on the customer side a one-hour response time is fast enough to meet the expectations of 89% of customers. The gap between those expectations and a 117-email day is precisely why triage systems, and increasingly automation, exist.
How Much Email Is Spam?
44.99% of global email traffic in 2025 was spam, according to Kaspersky's Spam and Phishing Report, which measures across Kaspersky's own mail-filter telemetry and counts scam and phishing mail in the spam bucket. The same report logged more than 144 million malicious and potentially unwanted email attachments, up 15% year over year. The 2025 share actually marks an improvement: Kaspersky measured spam at 47.27% of all email traffic in 2024. Nearly half of the world's largest communication network, in other words, is noise before a single legitimate message is read.
Where Email Gets Read
Apple's email clients accounted for 64.66% of tracked email opens in May 2026, with Gmail at 24.11%, together handling nearly 90% of opens, per Litmus's continuously updated email client market share data, drawn from over a billion tracked opens. Two caveats belong next to any client-share figure: the numbers move monthly, and Apple's Mail Privacy Protection inflates Apple-attributed opens by pre-loading messages. Litmus's last clean device split, from August 2021, put mobile at 41.6% of opens, webmail at 40.6%, and desktop at 16.2%; treat it as historical context rather than a current measurement.
AI and Email: The Newest Numbers
AI adoption statistics age faster than any other cluster on this page, and the current crop is striking. Microsoft and LinkedIn's 2024 Work Trend Index found 75% of global knowledge workers already use generative AI at work, with usage having nearly doubled in the preceding six months, and 90% of users saying AI saves them time. Gallup's mid-2025 workplace polling showed 40% of US employees using AI at least a few times a year, nearly double 2023's 21%, with daily use doubling in a single year; Gallup's late-2025 update put the figure at 45%. Pew Research adds the detail that matters for email: among workers using AI chatbots on the job, 52% use them to edit written content and 47% to draft it, and about a third of US adults now use AI at least sometimes to help write emails, per AP-NORC's July 2025 polling.
The most defensible measurement of AI's effect on email comes from a randomized experiment rather than a survey. Microsoft Research's six-month randomized experiment with over 6,000 workers across 56 firms found that workers who used the AI assistant spent about half an hour less reading email each week and completed documents 12% faster. Survey-based estimates land in the same range: in the St. Louis Fed's worker survey, generative AI users self-reported saving about 5.4% of their weekly work hours, roughly 2.2 hours in a 40-hour week.
Methodology
Every statistic on this page is attributed to a named primary source and its data year. Where the canonical figure is old (McKinsey's 28% from 2012, the USC reply-time study from 2015, Gloria Mark's mid-2000s fieldwork), the age is flagged rather than laundered, because those remain the most rigorous measurements available. Figures known to circulate with false recency, like the "126 emails per day" projection, are corrected inline. Telemetry is distinguished from surveys throughout. This page is reviewed and updated annually; the last full review was August 2026.
Frequently Asked Questions
How many emails are sent per day in 2026?
Roughly 392.5 billion emails per day in 2026, based on the Radicati Group's forecast path from 361.6 billion in 2024 toward 424.2 billion by 2028.
How many emails does the average person receive per day?
The average employee receives 117 emails per workday, per Microsoft 365 telemetry published in 2025. Older figures like 121 or 126 per day come from pre-2020 Radicati projections.
What percentage of email is spam?
44.99% of global email traffic in 2025 was spam according to Kaspersky, down from 47.27% in 2024.
How much time does the average worker spend on email?
The best-known estimate is McKinsey's 2012 finding that interaction workers spend 28% of the workweek, about 13 hours, on email. No comparably rigorous newer estimate exists, though Microsoft's 2025 telemetry shows email now bookends the day, with 40% of early-morning workers starting it in their inbox.
How is AI changing email?
Adoption is broad and accelerating: 75% of knowledge workers use generative AI at work, and about a third of US adults use AI to help write emails. In the strongest causal study to date, AI assistance cut email reading time by about 30 minutes per week.
The Takeaway
Email keeps growing, toward 424 billion messages a day, while human attention does not. The average employee now processes 117 emails daily inside a workday interrupted 275 times, replies are expected within the hour, and nearly half of global email traffic is spam before anything legitimate arrives. The response, visible in every 2025-2026 dataset, is delegation to software: a third of adults already draft email with AI, and controlled research shows measurable time returned.
This workload is the problem Ayari was built for. It connects to your Gmail or Outlook, triages what arrives, and sends you a daily briefing of the messages that actually need your attention, with replies drafted in your voice and ready to review. You deal with the handful of emails that matter; the rest stays handled in the background.