Microsoft Outlook - Sending / Receiving Emails
Affected
Major outage from 12:58 PM to 2:38 PM
- Resolved · UTCThis incident has been resolved. We have received confirmation from some of our previously affected users that they can now send and receive emails. After referencing this with Microsoft, they have also confirmed that this issue should now be resolved. If you continue to have any issues with this, please do contact us and we will look into this for you as soon as possible.
- Identified · UTC
Users may experience delays sending and receiving email messages
Issue ID: EX1144276
Affected services: Exchange Online
Status: Service degradation
Issue type: Incident
Start time: 29 Aug 2025, 11:36 BST - First reported failure to Total IT at 13:58.
Scope of impact
Some users who are located in Europe attempting to send or receive Exchange Online email messages may be impacted.
Root cause
An increase in internal service-to-service calls resulted in authentication failures, causing email delays and failures
Current status
29 Aug 2025, 14:06 BST
After analyzing diagnostic date we determined that excessive internal service-to-service calls resulted in authentication failures, causing email delays and failures. We’re throttling these calls to mitigate the issue and provide relief.
Next update by:
Friday 29 August 2025 at 16:00 BST
- Investigating · UTC
We are currently investigating this incident.
This appears to be a global outage on Microsoft 365