In the last few hours, Gmail has experienced one of its most serious email filtering failures . Users worldwide, including in Europe and Spain, have begun to notice their inboxes flooded with messages that previously stayed within the Promotions, Updates, or spam folders.
The problem isn't limited to a simple increase in annoying advertising. Everything points to a fundamental issue with the automatic sorting algorithms , which is causing a dangerous mix: spam and potentially fraudulent emails slipping into the main inbox while legitimate messages, such as purchase confirmations or work communications, end up being labeled as junk mail.
What is known about the Gmail filter failure
According to the Google Workspace status dashboard and various technical reports, the incident is related to a recent update to the machine learning systems responsible for combating spam . This modification reportedly caused a spike in the rate of "false positives" (legitimate emails incorrectly marked as spam) and, at the same time, allowed messages that should have been blocked or filtered to secondary tabs to pass through.
Google has acknowledged that incorrect email classifications and additional warnings are occurring within Gmail . Many users are encountering a banner at the top of some messages warning that "Gmail didn't scan you for spam, untrusted senders, or malware," indicating that certain security checks are not running properly.
The company itself has confirmed that its engineering teams are actively working to resolve the issue and revert the changes that caused this anomalous behavior. In statements sent to specialized technology media outlets, Google emphasizes that this is an ongoing incident and encourages users to follow standard security recommendations in the meantime.
Among the most discussed effects is the delay in the delivery of some emails , something especially problematic for those who rely on quick messages for two-step authentication or to validate sensitive transactions. Some users report that verification codes arrive late or get lost among dozens of marketing notifications.
How the error is affecting inboxes
One of the most visible consequences of the outage is that the traditional inbox structure has been disrupted . Users in various countries report that their Primary tab has been flooded with newsletters, promotions, and even phishing attempts, while the Promotions and Updates tabs remain almost frozen, with no new messages being properly filtered.
Complaints are multiplying on social media, forums, and Google help communities: many users claim that "all the spam goes straight to their inbox" and that spam alerts are appearing even on emails from known senders, such as stores where they regularly shop, subscription services, or professional contacts. This erratic behavior makes it very difficult to distinguish at a glance which messages are important and which should have stayed out of sight.
Added to all this is a matter of trust: those who have used Gmail for years have become accustomed to the filtering system acting as a reliable first line of defense. When that "wall" is lowered, users tend to continue behaving as if nothing has changed , opening emails and clicking on links with the same ease as always. Precisely for this reason, these types of vulnerabilities are perceived as especially dangerous from a security standpoint.
In some cases, the problem works in reverse as well. Order confirmations, shipping notifications, calendar invitations, and even internal company communications are ending up in the spam folder for no apparent reason . Anyone who doesn't check that folder regularly risks missing messages that are crucial to their daily work.
The technical origin: algorithms and machine learning
For years, Gmail has relied on a complex set of technologies to decide what to do with each incoming email. It's not just a blacklist of senders, but also machine learning models that take into account server reputation, typical spam language patterns , user behavior (what is marked as spam or removed from that folder), included links, attachments, and much more.
When any part of that system malfunctions, the symptoms are exactly what we're seeing these days: messages that should be filtered slip through to the main inbox , secondary tabs stop filling up as usual, and internal alerts indicate that the antispam or antimalware scan hasn't completed normally. All of this points to a problem with the update or deployment of these automatic systems.
Google explained in its status dashboard that the incident causes "incorrect sorting of emails in the user's inbox," combined with "delays in email delivery." In practice, this is not only organizational chaos but also a temporary degradation of the security layers that Gmail typically applies in the background.
The company has not publicly detailed the root cause, although the reference to recent changes in its intelligent systems suggests it could be a faulty deployment or a poorly calibrated setting in the spam detection models . The international technology community, including the European one, is awaiting further technical explanations that clarify exactly what went wrong and how it will be prevented from happening again.
Schedules, scope, and official recognition of the problem
The first widespread reports began appearing on the evening of January 24, with initial reports placing the start of the anomalies around 20:00 PM (local time in Vietnam) and a quickly visible impact across other time zones, including Europe and Spain . Shortly thereafter, both the Google Workspace dashboard and various specialized media outlets began reporting on the incident.
In its public statement, Google reiterated that its teams are “actively working to resolve the issue” and urged users to follow standard security practices with messages from unknown senders . Reassuring messages have also been sent to enterprise customers who rely on Gmail and Google Workspace for their daily operations.
Some sources indicate that the bug has caused an unusual surge in notifications on mobile devices and computers, as every promotional or update email that was previously silenced in its tab now triggers an alert . This has led many users to initially suspect a targeted spam attack, when in reality the source lies in Google's own filtering system.
The company later indicated that service should gradually return to normal over the next few hours , with spam filters and sorting tabs functioning properly again. However, users are advised to remain vigilant until the system is fully stabilized.
What can users do while the outage lasts?
While Google finishes adjusting its systems, it's wise to adopt a more cautious approach than usual. In practice, we must accept that the automatic filter may not be working perfectly and that, at least temporarily, the user becomes the last line of defense against spam and phishing; it's advisable to review common email marketing mistakes.
- Use “Mark as spam” and “Report phishing”Whenever a clearly suspicious email slips into your inbox, it's important to label it as such. These actions help retrain the account's signals and contribute to the system correcting its behavior.
- Check your spam folder more frequentlySince legitimate messages may be ending up there by mistake, it's a good idea to periodically check that folder and retrieve any important emails by marking them as "Not spam".
- Check the sender and domain carefully.In messages that appear to be from banks, courier companies, or well-known platforms, it is essential to check the sender's actual address and domain before clicking on any links.
- Avoid impulsive clicks on banners and linksIf Gmail displays warnings that a message has not been fully scanned, this should be interpreted as a warning sign and the email should be opened with great caution, if at all.
- Manually adjust the classification of some emailsMoving messages from Primary to Promotions (or vice versa) is still a valid way to tell Gmail where it should place similar communications in the future.
For individual users in Spain and the rest of Europe, these measures can make the difference between falling victim to a scam exploiting a flawed filter and detecting an identity theft attempt in time. In professional environments, manually reviewing certain critical inboxes—such as those for customer service or support—can prevent the loss of important messages from suppliers or clients.
As the hours passed, the volume of complaints seemed to be moderating, a sign that Google's fixes were beginning to take effect and the filters were returning to their normal behavior . Even so, the incident made it clear just how much millions of people depend on the proper functioning of automated systems that, most of the time, operate invisibly.
The experience with this Gmail filter failure highlights the fragility of entrusting the entire organization and security of email to algorithms that, although highly sophisticated, can also make mistakes and generate serious problems in a matter of minutes . For the user, the best defense remains combining these automatic filters with a healthy dose of skepticism, checking the spam folder from time to time, and never assuming that if something arrives in the main inbox, it is safe by default.