Mimecast incident

Degraded Service – Mimecast platform authentication and POP3 access issues.

Minor Resolved View vendor source →

Mimecast experienced a minor incident on September 1, 2026 affecting United States Grid and United States B Grid and 1 more component, lasting 1d 9h. The incident has been resolved; the full update timeline is below.

Started
Sep 01, 2026, 01:03 AM UTC
Resolved
Sep 02, 2026, 10:31 AM UTC
Duration
1d 9h
Detected by Pingoru
Sep 01, 2026, 01:03 AM UTC

Affected components

United States GridUnited States B GridUnited Kingdom GridSouth African GridAustralian GridGerman GridCanadian GridOffshore GridOffshore Grid (Administration Console)Offshore Grid (End User Applications)

Update timeline

  1. investigating Sep 01, 2026, 01:03 AM UTC

    We are aware that some customers may be experiencing issues authenticating to the Administration Console and end user applications. We are currently investigating the issue and updates will be posted here as they become available.

  2. identified Sep 01, 2026, 02:04 AM UTC

    We have identified the cause of authentication issues affecting the Administration Console and end user applications for some customers across multiple regions. Email flow and other services are not impacted. Our teams are actively working on a resolution, and further updates will be posted here as they become available.

  3. monitoring Sep 01, 2026, 03:22 AM UTC

    We have taken mitigation steps and believe we have resolved the issue causing login failures on the CA Grid (Canada region). Our Engineering team is deploying the fix to other regions and will continue closely monitoring the situation as services stabilize. We will provide further updates here.

  4. monitoring Sep 01, 2026, 06:34 AM UTC

    We can confirm that the login issue affecting the Administration Console has have been resolved. Our team has identified that a small subset of end users applications may continue to experience authentication issues. Our teams are actively working on a resolution, and further updates will be posted here as they become available.

  5. monitoring Sep 01, 2026, 09:43 AM UTC

    We continue to monitor the issue affecting login to the Administration Console. Our team continues to investigate the issue affecting a subset of end user applications and POP3 email, and further updates will be posted here as they become available.

  6. identified Sep 01, 2026, 01:59 PM UTC

    We can confirm that the issue with Administration Console and End User apps has been resolved. However, a fix for the issue with POP3 is currently in development and will be deployed as soon as possible. Further updates will be posted here as they become available.

  7. monitoring Sep 02, 2026, 06:34 AM UTC

    We have taken mitigation steps and believe we have resolved the issue affecting POP3 emails. Our Engineering team is closely monitoring the situation as services continue to stabilize and return to normal levels. We will provide further updates here as they become available.