Explore the latest developments concerning Microsoft: Exchange Online.
Microsoft Exchange Online Bug Disrupts Global Email Flow
A new security rule intended to block advanced phishing attacks has led Microsoft Exchange Online to quarantine legitimate emails, leaving users and businesses scrambling as the company works to resolve the issue.
On February 5, 2026, Microsoft Exchange Online users around the world woke up to a digital headache: their inboxes were suddenly quieter than usual, but not for the right reasons. Instead of the usual deluge of work updates and client requests, many found that critical emails—messages that should have sailed through with ease—had been mysteriously quarantined. The culprit? A new security rule, rolled out by Microsoft to bolster defences against ever-more cunning phishing attacks, had backfired, flagging legitimate correspondence as malicious and locking it away from its intended recipients.
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Exchange Online Flags Legit Emails As Spam
Microsoft has acknowledged a problem in Exchange Online that is pushing legitimate emails into quarantine as suspected phishing. The company says a URL-detection rule is overfiring, creating false positives that block some users from sending and receiving routine business messages. A fix is being rolled out, but affected tenants are seeing mixed results as quarantined mail is gradually released.
For organizations that live and die by their inbox, the practical question is simple: how do you recover missing messages now without opening the door to real threats? Here’s what’s happening and how to reduce disruption safely.
In a service alert highlighted by BleepingComputer, Microsoft attributes the issue to a newly applied URL rule that is misclassifying some legitimate links as malicious. That misclassification elevates the risk score and routes messages to quarantine as phish, even when senders and content are trustworthy. Microsoft reports that remediation is underway, with some previously quarantined messages reappearing in inboxes while the broader fix propagates.
For more detailed information, explore updates concerning Microsoft: Exchange Online.
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