Every day, emails are flying around the world for everything from invoices and meeting invites to abandoned cart reminders, newsletters, order confirmations and the message you don't remember subscribing to.
Despite predictions that social media, messaging apps and other platforms would make email less important, the numbers are still climbing.
According to Statista, 376.4 billion emails were sent and received worldwide every day in 2025. In 2026, that figure is projected to reach 392.5 billion emails per day, that's around 4.5 million emails every second.
Therefore, email isn't vanishing soon but for businesses, there's another side to those numbers, your email is competing with a huge amount of noise for someone's attention. Let's take a closer look at how much email we're truly sending, how that number has transformed and what it means for businesses using email marketing.
Around 392.5 billion emails are projected to be sent and received every day worldwide in 2026 according to Statista's worldwide email research and that figure has been climbing for years.
Source: Statista Research Department - Predicted emails sent per year in the billions
In 2018, we were sending and receiving around 281 billion emails a day and by 2025, that had increased by more than 95 billion emails per day. Statista expects that growth to continue, with daily email projected to pass 424 billion by 2028.
This works well visually because readers can directly see that email usage isn't out, it's still increasing.
392.5 billion emails in a day is a tough number to picture, so based on Statista's projected 2026 figure, about:
By the time you've finished reading this section, hundreds of millions more emails will have landed in inboxes around the world and that's where these numbers become more interesting for marketers. The challenge isn't whether people still use email but it is getting your email noticed by everything else they're receiving.
Nobody is sorting through 392 billion emails but individual inboxes can still get pretty crowded.
The average office worker receives about 121 business-related emails each day, while sending around 40 business emails. It appears before you consider personal emails, newsletters, online shopping notifications, subscriptions and everything else competing for attention. For businesses, this puts email marketing into perspective.
A campaign isn't just competing with another company's promotion, it could be sitting a client's urgent question, a meeting reminder, an invoice and another 100 emails waiting to be opened. A subject line can help, but there's no substitute for sending something people really want to receive.
There's another number worth paying attention to.
Over 160 billion spam emails are sent each day, representing close to 48% of global email traffic, meaning a huge proportion of what arrives in inboxes isn't necessarily wanted. That's particularly relevant for businesses running email campaigns. There's a big difference between email marketing and sending lots of emails.
About 1 in 5 emails globally (20%) contained phishing or spam content.
| Metric | 2026 DBIR report / APWG | Gartner 2025 |
|---|---|---|
| Human element in breaches | 62% | n/a |
| Phishing attacks observed (latest APWG full-year) | ~3.8M | n/a |
| Phishing as initial access | 16% | n/a |
| Leaders prioritising phishing reporting | n/a | 73% (n=65) |
| Training completion as top metric | n/a | 84% (n=65) |
| Email vs phone sim median click | ~1.4% / ~2% | n/a |
Source - Keepernetlabs and Verizon - Phishing reference stats by source year (headline numbers)
If people don't remember your business, didn't mean signing up to hear from you, or consistently ignore your emails, sending more isn't necessarily going to fix the problem. It can do the reverse.
Spam filters used to do keyword checks. Now, Google's own research shows filters are now steering writers to look for the network & pattern of an entire bulk send, instead of grading the copy in each email individually.
Spam content language produced by AI that is generic & too promotional, and is full of repetitive words and phrases across all sends, is exactly what the new filters are designed to detect. Sending more of the same could trigger a spam flag.
If you're running email marketing for your business, you are also doubting whether there's a limit to how many emails you can actually send, but the answer depends on what you're using to send them.
The daily limits include 500 emails for free Gmail accounts, 300 for free Outlook.com accounts and 1,000 for iCloud Mail. Google Workspace has a reported daily limit of 2,000, while limits for Microsoft 365 can vary depending on the plan. Being allowed to send 2,000 emails doesn't mean sending 2,000 emails is automatically a good idea.
| Provider | Daily Sending Limit | Per Message Recipients | Lockout Penalty |
|---|---|---|---|
| Gmail (free) | 500 | 500 | Up to 24 hours |
| Google Workspace | 2,000 | 2,000 | Up to 24 hours |
| Outlook.com (free) | 300 | 100 | Up to 24 hours |
| Microsoft 365 | 10,000 | 500 | Varies by plan |
| Yahoo Mail | 500 | 100 | Temporary block |
| iCloud Mail | 1,000 | 500 | Temporary block |
Source - Mailsoftly
The most useful takeaway from all these numbers is that we're approaching 400 billion emails every day, but businesses don't need to respond by adding even more noise. Instead, think about the person on the other side of the inbox. Why did they subscribe? What are they expecting from you? Would you open this email if it landed in your inbox? Perhaps most important, is there actually a reason you're sending it?
The same principle applies across digital marketing more content, more posts, more emails and more activity don't automatically create better results. Relevance matters.
AI isn't just helping businesses write more emails. It's starting to change how people read them too.
Klaviyo reports that Gmail and Apple Mail are already using AI to summarise emails, giving people an idea of what a message is about before they decide whether to open and read the whole thing.
That adds another layer to the fight for attention. Your subject line still matters, but it may no longer be the only thing shaping someone's first impression of your email. Klaviyo suggests thinking about how “summarisable” an email is, with a clear topic, useful information and an obvious purpose rather than burying the point beneath several messages or promotions.
For businesses, this makes relevance even more important. If an AI-generated summary can tell someone what your email is about before they open it, the content needs to give them a genuine reason to keep reading.
44% of those already using AI plan to use it to write emails or other content (Constant Contact's 2026 Small Business Now report). That's why it keeps growing, even as that same content is getting more and more value to get in your inbox. More people are sending more of their emails, more quickly, which means each business has to work even harder to get into the inbox.
The numbers suggest email itself isn't going anywhere. Daily email traffic continues to rise, even as people spend more time communicating through social media, messaging platforms and other digital channels but customer journeys don't happen in one channel anymore. Someone will discover your business through Google, read your website, follow you on Instagram and subscribe to your emails before becoming a customer.
Email is one part of that journey.
That's why it makes sense to think about how email works your website, SEO, content and other marketing channels, rather than treating it as a standalone activity.
Approximately 392.5 billion per day, or around 4.5 million every second.
And by 2028? Statista expects the figure to reach 424.2 billion emails per day.
Email isn't gone.
Far from it.
But with hundreds of billions of emails competing for attention every day, sending more isn't the answer for businesses, the better question is, are the emails you're sending actually worth opening?
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