Barracuda experienced a notice incident on January 22, 2026 affecting Mail Delivery, lasting 18h 25m. The incident has been resolved; the full update timeline is below.
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.