Bitdefender GravityZone incident

Slow email delivery inbound/outbound to Office 365

Minor Resolved View vendor source →

Bitdefender GravityZone experienced a minor incident on September 4, 2026 affecting Email Security, lasting 4h 27m. The incident has been resolved; the full update timeline is below.

Started
Sep 04, 2026, 10:48 AM UTC
Resolved
Sep 04, 2026, 03:16 PM UTC
Duration
4h 27m
Detected by Pingoru
Sep 04, 2026, 10:48 AM UTC

Affected components

Email Security

Update timeline

  1. investigating Sep 04, 2026, 10:48 AM UTC

    We're seeing slower delivery only to Office 365 and we are currently investigating

  2. 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

  3. 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.

  4. 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.