Abnormal Security incident
Inbound Email Security Message Processing Delays for Microsoft Customers in EU
Abnormal Security experienced a major incident on June 25, 2025 affecting Inbound Email Security (IES), lasting 19h 16m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Jun 25, 2025, 08:31 PM UTC
Starting at 19:00 UTC, Abnormal began experiencing message processing delays affecting Inbound Email Security for EU customers using Microsoft email systems due to Microsoft issue. During this time, some messages may experience delayed remediation. Abnormal's engineering team is actively working with Microsoft to resolve this issue and restore full functionality. Abnormal will provide the next update within 60 minutes or sooner as more information becomes available.
- investigating Jun 25, 2025, 09:24 PM UTC
Abnormal engineers continue to work closely with Microsoft engineers to resolve the message processing issues impacting Inbound Email Security for customers using Microsoft email systems in EU. The issue remains on Microsoft's platform, and Abnormal is actively collaborating with Microsoft to restore full functionality. Abnormal will provide the next update within 60 minutes or when significant progress is made.
- investigating Jun 25, 2025, 11:03 PM UTC
Microsoft has acknowledged the message processing issue affecting Inbound Email Security for customers using Microsoft email systems impacting EU customers and is actively working to resolve it on their platform. Abnormal will provide the next update when more information is available from Microsoft regarding their progress.
- identified Jun 26, 2025, 12:33 AM UTC
Microsoft has acknowledged the message processing issue affecting Inbound Email Security for customers using Microsoft email systems in EU and is working to roll back a recent change on their platform that caused this issue. Once Microsoft completes the rollback, Abnormal engineers will work to reprocess any messages that were impacted during this period. Abnormal will provide the next update when Microsoft's rollback is complete or when significant progress is made.
- monitoring Jun 26, 2025, 01:19 AM UTC
Microsoft has completed the rollback on their platform and Abnormal remediation services have recovered. Abnormal engineers are now working to reprocess messages that were impacted during the service disruption, which is expected to take several hours to complete. Abnormal will monitor the reprocessing and a final note will be sent out once this completes.
- resolved Jun 26, 2025, 03:48 PM UTC
Message reprocessing for impacted customers completed at 05:00 UTC. This issue is fully resolved. Thank you for your patience while Microsoft worked to resolve their issues. If you experience any further issues, please reach out to customer support at [email protected]