Resolved -
After monitoring and receiving confirmation from previously affected users, Microsoft has confirmed that the issue has been remediated. Email services are now operating as expected.
Additionally, the service will resume periodic attempts to deliver any emails that were sent during the impacted period but delayed.
We’ll continue to monitor to ensure stability, but no further impact is expected.
Aug 29, 17:50 CEST
Monitoring -
Microsoft has identified the root cause as excessive internal service-to-service calls leading to authentication failures. They are currently throttling these calls to stabilize the service and reduce impact.
Microsoft has deployed a new throttling rule to mitigate the issue. Early signals are positive: some previously affected users have confirmed they can now send and receive email, and Microsoft’s telemetry indicates that the rule is reducing failures and delays.
While the fix appears to be having the desired effect, the incident has not yet been fully declared resolved. We’ll continue to monitor closely and provide further updates.
Aug 29, 17:10 CEST
Investigating -
Microsoft is currently experiencing issues delivering emails to tenants within the EU. This is NOT a Teamtel issue and this status is informational.
Impacted emails will be temporarily deferred and we will continue to retry delivery.
Microsoft Status:
"We're investigating an issue in Europe where some users may experience delays when sending and receiving email messages. For more details, please look for EX1144276 in the admin center."
Aug 29, 16:16 CEST