Resolved after 18 hours 25 minutes, affecting Mail Delivery, on January 22, 2026.
Barracuda Networks is aware of reports of deferred email deliveries to Microsoft 365 (Exchange Online). Microsoft is currently returning a temporary error on inbound connections. Messages are queued by the sender's mail servers and will be retried automatically. Once Microsoft's service recovers, the messages should be delivered—no action needed from you. We're monitoring and will update when normal delivery resume. Status on Microsoft: status.cloud.microsoft
Affected components
Update timeline
- investigating Jan 22, 2026, 07:49 PM UTC
We're seeing deferred email deliveries to Microsoft 365 (Exchange Online). Microsoft is returning a temporary error on inbound connections. Messages are queued by the sender's mail servers and will be retried automatically. Once Microsoft's service recovers, the messages should be delivered—no action needed from you. We're monitoring and will update when normal delivery resumes. More info on Microsoft global status: status.cloud.microsoft
- monitoring Jan 22, 2026, 07:50 PM UTC
Barracuda Networks is aware of reports of deferred email deliveries to Microsoft 365 (Exchange Online). Microsoft is currently returning a temporary error on inbound connections. Messages are queued by the sender's mail servers and will be retried automatically. Once Microsoft's service recovers, the messages should be delivered—no action needed from you. We're monitoring and will update when normal delivery resume. Status on Microsoft: status.cloud.microsoft
- resolved Jan 23, 2026, 02:14 PM UTC
This incident has been resolved.
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