mailprotector incident
Microsoft Exchange Online experiencing intermittent mail flow issues
mailprotector is currently experiencing a minor incident affecting Issue Notice, which began 57 min ago. The vendor's full update timeline is below.
Affected components
Update timeline
- identified Jun 03, 2026, 03:46 PM UTC
Microsoft is experiencing intermittent issues with mail flow. Please see their notice for reference. https://admin.cloud.microsoft/#/servicehealth/:/alerts/EX1331830 Mailprotector is monitoring the situation. However, mail flow with CloudFilter and Shield appears to be normal. Please check logs to identify bounces or delays from Microsoft hosts to confirm potential effects from their systems.
- identified Jun 03, 2026, 04:33 PM UTC
Microsoft Defender is restricting connectors due to false-positive reports. Please go to Microsoft Defender > Restricted Entities and unblock the listed connectors. (https://security.microsoft.com/restrictedentities) You will need to monitor and check on this restriction for the time being. We have observed that Microsoft restricts the connector after a short time, and the unblock request must be made again. We are continuing to monitor and investigate possible mitigation options.