Microsoft's Exchange Online quarantines legitimate emails mistakenly flagged as phishing — disrupting worldwide inboxes

Feb 10, 2026 - 02:00
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Microsoft's Exchange Online quarantines legitimate emails mistakenly flagged as phishing — disrupting worldwide inboxes
Microsoft Exchange Online mistakenly flags safe emails as phishing threats, sending them into quarantine. The company has confirmed a faulty detection rule as the cause.

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