Editor’s note (March 2026): This article is part of the Blog Herald’s editorial archives. Originally published in 2010, it has been revised and updated to ensure accuracy and relevance for today’s readers.
Back in 2010, an infographic made the rounds showing it the evolution of e-mail — from the ARPANET experiment to a system carrying 2 billion messages per day. At the time, this number seemed amazing. Facebook was the dominant webmail address. Spam was already a serious problem. HTML email was only about ten years old.
Fourteen years later, almost everything about this picture has grown beyond recognition. The email connection was not broken. It has quietly become the backbone of the entire internet economy. And understanding how it got here and what it looks like now is still important to anyone building an online audience.
From 2 billion to 376 billion: a change in scale
A 2010 infographic noted that 2 billion emails are sent every day. This figure almost seems strange now. In 2025, an estimated 376.4 billion emails will be sent and received per day globally – and this number is predicted to continue to rise, with some predictions that it will exceed 408 billion by 2027.
The user base has grown to match. There are currently approximately 4.6 billion email users worldwide – more than half of the world’s population. Most of them maintain more than one account, which puts the total number of active email addresses over 8 billion. It is one of the few technologies where the growth curve is not flattening.
Interestingly, this growth has occurred alongside the rise of messaging apps, social platforms, and everything else that was supposed to replace it. WhatsApp, Slack, Instagram DMs: none of them killed email. If anything, they’ve pushed it further into a niche role better than any other: identity infrastructure, transactional communication, and access to owned audiences.
For bloggers and content creators, this last point is worth sitting through. Social platforms rent you an audience. Your email list is the only channel you really own a relationship with.
The spam problem: bigger, smarter, more dangerous
One thing the 2010 infographic was keeping a close eye on was spam – and rightly so. Even then, spam was eating up a significant portion of global email traffic. The original infographic listed Russia, Turkey, South Korea and the United States as the main sources of spam, and noted that anti-spam legislation was codified into law.
Today the situation is more complicated. Spam as a percentage of total email traffic has actually fallen from a peak of 80% in 2011 to around 46.8% at the end of 2024. That sounds like progress. But when you’re dealing with a daily database of 376 billion emails, 46.8% still means about 176 billion spam messages per day. The absolute volume is higher than before.
Of greater concern is what spam becomes. In 2010, spam was mostly a nuisance – ads, adult content, financial gain. Today, approximately 3.4 billion phishing emails are sent every day. About 1 in every 412 emails is a phishing attempt, and AI-generated scams make these attempts significantly more credible. Some platforms reported a 1,265% increase in AI-generated threats detected between 2024 and 2025. The average cost of a phishing breach in 2024 was $4.88 million.
This is especially important for bloggers, as email list integrity is now a matter of security, not just deliverability. A malicious list, a fake domain, or a phishing campaign impersonating your newsletter can destroy the trust you’ve spent years building.
The webmail landscape then and now
In November 2010, an infographic listed the most popular webmail providers visiting websites: Yahoo Mail at about 3.3%, Gmail at 7.18%, and Facebook—then experimenting with a messaging tool that would integrate email—at 10.4%.
That world is unrecognizable today. Gmail currently sends more than 120 billion emails daily and has a market share of around 35% globally. Apple Mail has quietly taken the lead in email opens, with nearly 50% market share in that metric – driven almost entirely by the growth of the iPhone. Outlook still has over 400 million active users.
What this means in practice: the technical realities of email delivery are shaped by a few dominant players, not hundreds of competing services. When Google tightened its sender authentication requirements in 2024 and began implementing DMARC, DKIM, and SPF at scale, it affected every content creator who sent a newsletter. Gmail blocked 265 billion unverified emails in 2024 alone. These aren’t abstract security issues—they’re delivery issues that directly affect whether your content reaches the people who demand it.
What bloggers can actually take away from this
The evolutionary arc of e-mail carries several lessons that may not be obvious at first glance.
The first is sustainability. Email has survived every wave of disruption since 1971 because it’s a protocol, not a platform. No one owns. That structural fact is why it’s still here, and therefore building on it—through newsletters, automations, or direct subscriber relationships—remains one of the most defensible things a content creator can do.
Second, scale creates noise. With 376 billion emails sent every day, attention spans are short and filters are aggressive. The bar for email quality—compliance, trust signals, authentication hygiene—is higher than ever. Inbox access is no longer automatic. You have to win.
The third is more troubling: the same infrastructure that connects you to your audience connects scammers to potential victims. Artificial intelligence is reducing the cost of producing convincing phishing emails at a rate that is hard to keep track of. As a publisher with a recognized name and subscriber relationship, your brand is worth protecting. This means taking domain identification seriously, thinking about list hygiene, and focusing on deliverability as a craft rather than an afterthought.
Email began as a way for researchers to leave messages to each other on a shared network. It has become the connective tissue of the Internet. Fifteen billion spam emails are blocked by Gmail alone every day – and yet 93% of people check their email at least once a day. This is not inertia. It is a medium that has earned its place.
An infrastructure built over five decades is still the most reliable way to reach an audience on your own terms. This has not changed since 2010. It is everything around that changes.
