Bitdefender GravityZone incident
Slow email delivery inbound/outbound to Office 365
Resolved after 4 hours 27 minutes, affecting Email Security, on September 4, 2026.
We're no longer observing live deferred events. We're continuing to monitor the situation, but at this point we consider the situation resolved.
Affected components
Update timeline
- investigating Sep 04, 2026, 10:48 AM UTC
We're seeing slower delivery only to Office 365 and we are currently investigating
- identified Sep 04, 2026, 11:53 AM UTC
This appears to be related to an ongoing issue on Microsoft 365 infrastructure. It can be tracked via the below link. https://admin.cloud.microsoft/?#/servicehealth/:/alerts/EX1467029
- monitoring Sep 04, 2026, 01:03 PM UTC
We're beginning to see improvements with delivery into Microsoft 365's infrastructure. We are still seeing some messages being given a deferral by them. They have acknowledged the issue publicly and that they are applying mitigations: https://x.com/MSFT365Status/status/2095853672643072434 We'll continue to monitor https://x.com/MSFT365Status and post updates.
- resolved Sep 04, 2026, 03:16 PM UTC
We're no longer observing live deferred events. We're continuing to monitor the situation, but at this point we consider the situation resolved.
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