Some users’ email messages may not be quarantined and fail to be stored in the quarantine folder
ID: EX1478331
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’ email messages may not be quarantined and fail to be stored in the quarantine folder
User impact: Users’ email messages may not be quarantined and might fail to be stored in the quarantine folder.
More info: The following error appears in message trace: '550 5.1.10 Failed to deliver to Quarantine store'.
Current status: We've identified a recent service-side update that introduced an impacting code error that's causing some email messages to not be quarantined and fail to be stored in the quarantine folder. As we develop a code fix to remediate the impact, we're exploring a secondary potential mitigation option involving moving affected service traffic. We're expecting more clarity into our mitigation action plan by our next scheduled communication update.
Scope of impact: This issue may impact users attempting to have email messages quarantined in Exchange Online. This section may be updated as the investigation progresses.
Root cause: A recent service-side updated unintentionally introduced a code error that has caused this impacting event.
Next update by: Thursday, October 1, 2026, at 1:00 AM UTC
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