Gmail spam filter malfunction floods inboxes with misclassified emails
Gmail's spam detection system malfunctioned on Saturday, January 25, 2026, causing widespread misclassification of emails and incorrect spam warnings. Google reported the issue began around 5am Pacific time and was fully resolved by Saturday evening.
What happened
According to Google Workspace's official status dashboard, a spam detection malfunction began around 5am Pacific time on Saturday, January 25, 2026, causing emails to be misclassified and triggering additional spam warnings for messages that would normally be considered safe.
Gmail users reported their primary inbox flooded with emails that typically appear under Promotions, Social, or Updates tabs, while some legitimate messages from known senders were incorrectly flagged with spam warnings. Some users reported spam messages bypassed Gmail's filters entirely, landing directly in their inboxes.
Google confirmed awareness of the issue on Sunday and posted that the issue had been fully resolved for all users by Saturday evening. The company noted that misclassified spam warnings from the incident may persist for existing messages received before resolution.
Reported impact
The disruption raised concerns about the reliability of Gmail's automated spam detection system, which millions of users rely on daily to protect against phishing and malicious content.
Users described the situation as Gmail's filtering system being suddenly completely busted, with spam management workflows disrupted across multiple regions.
Index analysis
The malfunction affected email classification logic across Gmail's categorization system, causing the automated filter to both over-flag legitimate messages and under-filter spam content simultaneously.
Governance controls
Google stated that engineers were working to restore normal service and that users should continue to follow standard safety practices when interacting with messages from unknown senders until the problem was fully resolved.
The company said it will publish an analysis of the incident once internal investigation is completed.
Classification
Sources and evidence
Sources not yet published
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