Some users' legitimate email messages are being marked as phish and quarantined in Exchange Online
ID: EX1227432
Issue type: Incident
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Status
Service Degradation
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Impacted services
Exchange Online
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Details
Title: Some users' legitimate email messages may be marked as phish and quarantined in Exchange Online
User impact: Users' legitimate email messages may be marked as phish and quarantined in Exchange Online.
Current status: We're continuing to release the quarantine messages for the affected users to fully resolve this problem. In parallel, we're actively working to evaluate additional remediation actions to perform in order to expedite the process of recovery.
Scope of impact: Some users attempting to send or receive Exchange Online email messages may be impacted.
Root cause: The email messages are getting incorrectly marked as phish and quarantined in Exchange Online due to ever-evolving criteria aimed at identifying suspicious email messages, as spam and phishing techniques have become more sophisticated in avoiding detection.
Next update by: Saturday, February 7, 2026, at 12:30 AM UTC
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