mailprotector incident
Microsoft 365 service disruption affecting Shield and CloudFilter
Ongoing since 06:35 PM UTC, affecting Shield and CloudFilter and SafeSend Email Security.
Microsoft has begun redistributing connection traffic and restarting affected servers to reduce the impact of its ongoing service disruption. Some connectivity issues and email delivery delays may continue while Microsoft works to restore service. We’re continuing to monitor the impact on Shield and CloudFilter and will share updates as we learn more.
Affected components
Update timeline
- identified Nov 12, 2026, 06:35 PM UTC
Microsoft is investigating an Exchange Online issue affecting mailbox access in the Americas. Microsoft is tracking the issue as EX1550543. We’re seeing Microsoft Graph API errors that are affecting Shield’s ability to access Microsoft 365 mailboxes. We’re also seeing Microsoft’s servers temporarily defer messages from Shield and CloudFilter, resulting in email delivery delays for affected Microsoft 365 customers. This issue originates with Microsoft and is not caused by Shield or CloudFilter. Our team is monitoring the impact and investigating options to mitigate delivery delays. We’ll share updates as we learn more.
- identified Nov 12, 2026, 07:42 PM UTC
Microsoft has begun redistributing connection traffic and restarting affected servers to reduce the impact of its ongoing service disruption. Some connectivity issues and email delivery delays may continue while Microsoft works to restore service. We’re continuing to monitor the impact on Shield and CloudFilter and will share updates as we learn more.
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