Hit ship, and your electronic mail lands in somebody’s inbox. That’s how most individuals suppose electronic mail works. If you zoom out and study one billion messages, actuality seems to be nothing like that.
That’s what we did. After analyzing nameless information of 1 billion messages that flew by way of our platform, we found that lower than half truly deserved to be delivered to shoppers inboxes. The remaining? Blocked by spam and virus filters for being suspicious, unsafe, or straight-up malicious.
And even among the many inbox-worthy emails, only a few had been written by actual individuals. Solely two classes – private electronic mail suppliers and low-volume senders – often contain somebody truly typing a message and hitting ship. Collectively, they make up below 30% of obtained mail, which is just about 13% of all electronic mail visitors. Almost every little thing else comes from automated methods sending notifications, reminders, promotions, digests, and alerts.
Let’s dive deep into our evaluation to raised perceive how the web truly communicates right this moment.
Contained in the 43.9% that will get by way of
We grouped the obtained messages into 10 classes primarily based on who was sending them and why. This helps present the “regular” electronic mail ecosystem most of us work together with daily.
1. Enterprise instruments and SaaS (21.62% of obtained mail, 9.49% of all mail)
The most important group represents platforms individuals use daily for work:
- Enterprise apps (CRMs, gross sales instruments, and so forth.)
- Mission administration
- File sharing and collaboration
They ship issues like account updates, activity reminders, cart and order notifications, login alerts, password reminders, verification codes, crew messages, and workflow automation emails, to call a number of. These messages are high-volume however professional, forming the spine of on-line work.
2. Private electronic mail suppliers (19.82% of obtained mail, 8.70% of all mail)
This consists of typical on a regular basis senders utilizing companies like Gmail, Outlook, Hotmail, Yahoo, and others for normal person-to-person communication, forwarded messages, and small enterprise communication.
Whereas many individuals nonetheless use private electronic mail accounts to speak, the quantity is modest today. Most day-to-day conversations have shifted to messaging apps, social networks, or crew chats.
3. Advertising and marketing and e-newsletter platforms (15.92% of obtained mail, 6.99% of all mail)
These messages come from companies and organizations utilizing massive electronic mail platforms like Amazon SES, SendGrid, and HubSpot to ship promotions, newsletters, and comparable content material.
Such emails are often allowed so long as the sender follows authentication requirements, and folks aren’t marking their emails as spam.
4. Social networks and communities (15.00% of obtained mail, 6.58% of all mail)
Platforms corresponding to Fb, Instagram, LinkedIn, and TikTok typically fill inboxes with emails about:
- Pal requests
- Login alerts
- Messages and submit notifications
- Neighborhood updates
Some individuals discover these emails pointless, however excessive engagement retains them deliverable.
5. Low-volume electronic mail senders (9.89% of obtained mail, 4.34% of all mail)
This group covers small companies, private domains, and area of interest companies that ship solely occasional messages, corresponding to person-to-person emails, order confirmations, or assist replies from customized domains. Their low quantity means they not often set off spam filters, which helps their messages attain the inbox reliably.
6. Ecommerce and marketplaces (5.46% of obtained mail, 2.40% of all mail)
Amazon, eBay, Mercado Livre, AliExpress, and Shopee are a few of the busiest marketplaces in our shoppers’ inboxes. They ship order confirmations, transport updates, vendor messages, and account alerts.
Even individuals who ignore most advertising emails nonetheless depend on these messages as a result of they assist observe purchases and hold clients up to date on their orders.
7. Monetary companies and funds (3.65% of obtained mail, 1.60% of all mail)
Banks, neobanks, and cost companies like PayPal and Stripe primarily ship:
- Cost receipts
- Fraud alerts
- One-time passwords
- Assertion notifications
These messages are essential for shoppers, however they’re additionally widespread targets for spoofing. That’s why an analogous group exhibits up within the blocked messages as properly.
8. Media and leisure (3.65% of obtained mail, 1.60% of all mail)
Providers like Netflix, Disney+, HBO, and Substack hold inboxes busy with updates about what to look at, learn, or make amends for subsequent. Apart from newsletters and new content material suggestions, additionally they ship billing reminders to their shoppers.
These messages are inclined to get excessive engagement as a result of they level individuals to the content material they genuinely care about.
9. Job and recruitment platforms (2.73% of obtained mail, 1.20% of all mail)
Apply for a job on-line and your inbox fills up quick with job alerts, interview requests, recruiter messages, and updates about your functions.
Emails from Certainly, Upwork, Naukri, JustDial, and different job platforms stand out as a result of individuals don’t wish to miss a possibility that might form their profession path.
10. Journey and logistics (2.26% of obtained mail, 0.99% of all mail)
Inbox spikes from firms like Uber, Reserving, and Airbnb typically occur proper earlier than individuals journey. These platforms ship:
- Reserving and reservation particulars
- Reminders
- Journey-change alerts
- Receipts
These messages are often welcome as a result of they assist individuals keep organized and keep away from surprising points throughout their journey.
Contained in the 56.1% that will get blocked
Our filtering system blocks way more electronic mail than it delivers – and for good purpose. Malware, phishing makes an attempt, faux senders, unsafe servers, and compromised accounts by no means attain shoppers’ inboxes. This hidden layer of electronic mail visitors exhibits how a lot harmful exercise occurs behind the scenes, and the way we work to maintain you protected.
1. Phishing, scams, malware, botnets (33.87% of rejected mail, 19.00% of all mail)
The largest class can also be probably the most harmful one. These senders attempt to steal data, unfold malware, or imitate trusted web sites to trick customers. They typically depend on automated methods, fast-changing domains, and botnets to keep away from detection.
Luckily, most threats by no means make it by way of, as a result of their patterns match recognized phishing kits, malware loaders, faux outlets, and botnet-driven spam.
2. Suspicious entrepreneurs and aggressive lead-gen senders (21.94% of rejected mail, 12.30% of all mail)
This group behaves extra like spammers than professional companies. They typically use scraped lists and ship massive volumes of undesirable promotional messages.
Their emails aren’t at all times malicious, however they create numerous inbox noise and frustration. They’re blocked on account of excessive criticism charges and bulk campaigns originating from low-reputation domains.
3. Unverified or misconfigured on-line companies (10.82% of rejected mail, 6.07% of all mail)
Generally the message itself is completely superb, however the system sending it isn’t arrange appropriately. If a web based service sends emails from a server with lacking SPF or DKIM data, open relays, weak safety, or uncommon sending patterns, the message seems to be dangerous even when it’s professional.
We block these emails as a result of misconfigured methods are a standard supply of spam, abuse, and compromised exercise.
4. Private mailboxes used suspiciously (9.72% of rejected mail, 5.45% of all mail)
Even messages from Gmail or Outlook can get blocked in the event that they’re being utilized in ways in which don’t look regular. This occurs, for instance, when a private inbox is hacked or when somebody makes use of it to ship a number of messages by way of automation instruments.
We block emails after we see sudden spikes in quantity, or our methods detect spam, phishing, viruses, or unsolicited chilly outreach.
5. E-mail infrastructure and ESPs utilized by dangerous actors (6.83% of rejected mail, 3.83% of all mail)
Trusted platforms like Amazon SES or SendGrid serve tens of millions of professional clients, however spammers additionally attempt to disguise behind them. We block messages when sending patterns clearly present abuse or habits that doesn’t match regular enterprise use.
6. Authorities and public sector (3.61% of rejected mail, 2.03% of all mail)
Emails from authorities businesses and public establishments are often professional, however they’re typically despatched in bulk and generally come from outdated methods or have misconfigured DNS data. We block them when weak authentication or uncommon habits makes them look unsafe or much like phishing makes an attempt that imitate official sources.
7. Monetary establishments and funds (3.44% of rejected mail, 1.93% of all mail)
Banks and cost companies are widespread targets for spoofing, so our filters deal with them very rigorously. We block messages when authentication is weak or the habits seems to be even barely suspicious, since that always alerts an impersonation try.
8. Legit SaaS and B2B manufacturers (3.26% of rejected mail, 1.83% of all mail)
Messages from well-known CRM instruments, productiveness apps, and different enterprise platforms can nonetheless be blocked when one thing on the technical facet isn’t proper. Lacking authentication, dangerous DNS settings, poor shared IP popularity, or clients sending in bulk could make these in any other case professional emails look suspicious.
9. Invalid, native, or non-internet senders (2.79% of rejected mail, 1.56% of all mail)
Some messages by no means had an actual probability to be delivered as a result of they didn’t come from correct internet-facing domains within the first place. These embody inner community hosts, check environments, placeholder domains, or methods configured with non-resolvable addresses like “localhost”.
Normally, these aren’t malicious, simply misconfigured or not meant to ship emails to the surface world.
10. Shopper platforms and social networks (2.71% of rejected mail, 1.52% of all mail)
Not all messages from Fb, Instagram, and Quora attain the inbox. These platforms ship massive volumes of notifications, which might set off filters when customers not often have interaction with them or when sending patterns shift. Low interplay, bulk habits, or technical points could make their emails look extra like spam than helpful updates.
What you are able to do about it
There are two sides to electronic mail: all of us need much less spam, and all of us need our personal messages to achieve the correct individuals. The excellent news is that you may enhance each with a number of easy habits.
The best way to scale back inbox noise
Right here’s how one can hold undesirable mail out of your inbox:
- Keep non-public. Keep away from posting your electronic mail publicly and be selective with newsletters or giveaways. Spammers scrape the online and commerce mailing lists, so as soon as your deal with leaks, undesirable mail can comply with you for years.
- Practice your supplier. Use electronic mail filters and report spam. This helps your electronic mail supplier be taught your preferences and block comparable messages sooner or later.
- Separate accounts. Use completely different addresses or electronic mail aliases for private life, buying, and work. Clear boundaries make inboxes simpler to handle and scale back muddle.
- Clear up. Unsubscribe from something you don’t learn, and revisit outdated signups commonly. However bear in mind: don’t click on “unsubscribe” in suspicious emails – it confirms your deal with is lively. Delete these as an alternative.
- Restrict alerts. Flip off notifications you don’t want. Social networks and apps ship way more electronic mail by default than most individuals count on.
The excellent news is that sensible instruments can do many of the heavy lifting for you. In Hostinger Mail, you may ask your AI agent Kodee to report spam in bulk, clear up your mailbox, create filters and guidelines, arrange aliases, or unsubscribe from undesirable senders at scale. On high of that, the built-in AI can summarize threads, spotlight what issues, and allow you to discover what you want quick, with none guide work.
How to ensure your personal messages are obtained
Good deliverability isn’t luck; it comes from a number of habits that sign to inbox suppliers that you just’re a reliable sender.
Let’s see the precise the reason why emails get blocked – and how one can keep away from every problem.
- Poor sender popularity (33.9% of rejected mail). Popularity drops while you ship to outdated lists, get marked as spam, or generate numerous undeliverable mail. These alerts add up throughout your entire web, not only one system. Don’t electronic mail individuals who by no means requested to listen to from you, take away inactive subscribers, and keep related along with your content material to maintain your popularity excessive. Use instruments like Google Postmaster or your supplier’s analytics to regulate supply, spam charges, and area well being.
- Domains that don’t resolve (21.73% of rejected mail). If a site doesn’t exist or hasn’t totally propagated but, the e-mail gained’t get by way of. This typically occurs with brand-new domains or spoofed domains utilized by spammers. In case you simply purchased a site identify, wait a number of hours for the receiving methods to verify who you’re.
- Mailbox doesn’t exist (17.29% of rejected mail). Hitting too many invalid inboxes is a quick observe to a nasty popularity. This typically occurs with outdated lists or bought databases. When suppliers see repeated makes an attempt to achieve nonexistent customers, they assume you’re sending blindly – and begin blocking you.
- Exceeded charge limits (10.67% of rejected mail). Large bursts of electronic mail can appear like bot exercise. In case you’re sending too many messages directly, suppliers sluggish you down or briefly block the visitors. Heat up steadily and keep away from sudden spikes that resemble spam.
- Technical or protocol points (6.98% of rejected mail). When the system can’t confirm who you’re, it may possibly deal with you as an impersonator. Lacking SPF, DKIM, or DMARC data, incorrect server identification, and improper headers can all trigger rejections.
- Dangerous message content material (6.21% of rejected mail). Generally the issue isn’t the sender – it’s the message itself. Phishing-style hyperlinks, ALL-CAPS topics, lacking headers, mismatched sender particulars, and strange formatting all elevate purple flags. The extra alerts in an electronic mail, the larger the possibility it would get rejected. Emails with virus attachments additionally fall into this class.
- Mailbox full (3% of rejected mail). The difficulty may be on the different finish of the road: the recipient’s inbox has no room left. These bounces aren’t dangerous on their very own, however they add up for those who hold sending to the identical full mailbox with out pausing.
Closing ideas
E-mail might really feel easy from the surface, however behind the scenes, it’s one of the crucial advanced – and most abused – communication methods on-line.
Our evaluation of 1 billion messages exhibits a transparent divide: professional work and private communication make up most obtained mail, whereas scammers, botnets, and misconfigured methods generate nearly all of blocked visitors.
Understanding who’s sending what and why messages get rejected helps everybody keep safer and talk extra successfully.
With higher habits and smarter instruments, you may reclaim your inbox – and the time it silently takes from you daily.
Methodology
This evaluation relies on anonymized information from one billion emails processed by way of Hostinger’s infrastructure in January 2026. We don’t learn message content material – solely technical metadata corresponding to sender domains, authentication outcomes, popularity alerts, and supply outcomes.
Gediminas is a communications specialist enthusiastic about applied sciences and their prospects. His essential accountability is to assist individuals perceive Hostinger merchandise and their options. He likes spending his free time bathing within the sizzling tub, grilling, taking part in poker, fishing, and different actions.
