Mimecast Outage History

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Mimecast had 10 outages in the last 2 years totaling 65h 30m of downtime — averaging 0.4 incidents per month.

There were 10 Mimecast outages since April 19, 2026 totaling 65h 30m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.mimecast.com

Minor June 9, 2026

Email Delivery Delays | ZA Grid

Detected by Pingoru
Jun 09, 2026, 09:42 AM UTC
Resolved
Jun 09, 2026, 01:08 PM UTC
Duration
3h 25m
Affected: South African GridOffshore Grid (Email Processing)
Timeline · 3 updates
  1. investigating Jun 09, 2026, 09:42 AM UTC

    We are aware that customers in ZA grid may be experiencing email delivery delays. We are currently investigating the issue and updates will be posted here as they become available.

  2. identified Jun 09, 2026, 09:57 AM UTC

    We have identified the cause of the email delivery delays affecting customers in ZA. Engineering are working to resolve this. Further updates will be posted here as they become available.

  3. monitoring Jun 09, 2026, 10:09 AM UTC

    The email delivery delays affecting customers in ZA have been resolved. We are monitoring to ensure full stability. Further updates will be posted here as they become available.

Read the full incident report →

Minor June 9, 2026

Email delivery delays on US grid

Detected by Pingoru
Jun 09, 2026, 01:45 AM UTC
Resolved
Jun 09, 2026, 04:04 AM UTC
Duration
2h 19m
Affected: United States GridUnited Kingdom GridSouth African GridOffshore Grid (Email Processing)
Timeline · 3 updates
  1. investigating Jun 09, 2026, 01:45 AM UTC

    We are aware of a service disruption that is impacting email delivery to Office 365 tenants for a subset of US hosted customers. We are investigating this issue and will post further updates here.

  2. identified Jun 09, 2026, 02:31 AM UTC

    We have identified the issue impacting email delivery to Office 365 tenants for a subset of US hosted customers and are working to resolve it. We will provide further updates as they become available.

  3. monitoring Jun 09, 2026, 03:26 AM UTC

    We have resolved the email delivery issue affecting Office 365 tenants for US-hosted customers. Mitigation efforts are ongoing for UK and ZA hosted customers, and we will provide further updates as work continues.

Read the full incident report →

Minor June 6, 2026

Degraded performance on US grid

Detected by Pingoru
Jun 06, 2026, 03:41 AM UTC
Resolved
Jun 06, 2026, 08:22 AM UTC
Duration
4h 40m
Affected: United States GridOffshore Grid (End User Applications)Offshore Grid (Remediation)
Timeline · 3 updates
  1. investigating Jun 06, 2026, 03:41 AM UTC

    We are aware that a small subset of customers hosted on our US grid may be experiencing a degraded service. We are currently investigating the issue and updates will be posted here as they become available.

  2. identified Jun 06, 2026, 05:04 AM UTC

    We believe we have identified the issue affecting a small subset of US-hosted customers and are working to resolve it. We will provide further updates as they become available.

  3. monitoring Jun 06, 2026, 05:54 AM UTC

    We have taken mitigation steps and continue to see improved services for previously impacted customers hosted on our US grid. We are continuing our resolution and further updates will be posted here.

Read the full incident report →

Minor June 1, 2026

Degraded Service – Partner Portal Access

Detected by Pingoru
Jun 01, 2026, 09:32 PM UTC
Resolved
Jun 02, 2026, 12:29 AM UTC
Duration
2h 57m
Affected: Points of ContactPoints of Contact (Mimecaster Central Community)
Timeline · 1 update
  1. investigating Jun 01, 2026, 09:32 PM UTC

    We are aware of a service disruption impacting access to the Partner Portal for some customers. Users may be unable to log in or may experience errors when attempting to access the portal. We are currently investigating the issue and will post further updates here as they become available.

Read the full incident report →

Minor May 26, 2026

German (DE) Mail Processing Degraded

Detected by Pingoru
May 26, 2026, 01:37 PM UTC
Resolved
May 26, 2026, 02:26 PM UTC
Duration
48m
Affected: German GridOffshore Grid (Email Processing)
Timeline · 2 updates
  1. investigating May 26, 2026, 01:37 PM UTC

    We are aware that some customers hosted on the German (DE) grid may be experiencing degraded service affecting email processing. We are currently investigating the issue, and updates will be posted here as they become available.

  2. monitoring May 26, 2026, 01:54 PM UTC

    We have taken mitigation steps and believe impact to the service has been addressed. While recovery continues, some small mail flow delays may persist as the backlog clears. Our Engineering team is closely monitoring performance and investigating the cause of the high load. Further updates will be provided as needed.

Read the full incident report →

Minor May 19, 2026

Degraded service for SAML authentication on US, USB and UK Grids

Detected by Pingoru
May 19, 2026, 04:38 PM UTC
Resolved
May 20, 2026, 03:00 AM UTC
Duration
10h 21m
Affected: United States GridUnited States B GridUnited Kingdom GridOffshore Grid (Authentication)
Timeline · 3 updates
  1. investigating May 19, 2026, 04:38 PM UTC

    We are aware that some customers hosted on our US-B grid may be experiencing issues with SAML login attempts to the Administration Console and associated applications. Other authentication methods are functioning normally. We are currently investigating the issue and updates will be posted here as they become available.

  2. identified May 19, 2026, 04:58 PM UTC

    We believe we have identified the issue affecting some customers hosted on our US-B grid who are experiencing failures with SAML login attempts to the Administration Console and associated applications. Our Engineering team is actively investigating the underlying cause and is currently testing a change to validate the suspected configuration issue. We will provide further updates as they become available.

  3. monitoring May 19, 2026, 05:23 PM UTC

    We have taken mitigation steps and believe we have resolved the issue affecting SAML authentication for customers hosted on our US, USB and UK grids. Successful authentication attempts are now being reported, and we are no longer seeing related errors in our monitoring systems. Our Engineering team is closely monitoring the situation to ensure continued stability. Further updates will be posted here as they become available.

Read the full incident report →

Minor May 19, 2026

TTP URL and Browser Isolation Errors on US and USB Grids

Detected by Pingoru
May 19, 2026, 01:59 PM UTC
Resolved
May 19, 2026, 06:27 PM UTC
Duration
4h 28m
Affected: United States GridUnited States B GridOffshore Grid (Threat Protection)
Timeline · 2 updates
  1. investigating May 19, 2026, 01:59 PM UTC

    We are aware that some customers hosted on our US and USB grids may be experiencing issues accessing rewritten links, where URLs are being redirected through Browser Isolation and may result in an error. We are currently investigating this issue and will post updates here as they become available. All other Mimecast services are operating as normal.

  2. monitoring May 19, 2026, 03:05 PM UTC

    We have taken mitigation steps and believe we have resolved the issue that caused certain TTP URL links to be incorrectly redirected through Browser Isolation for customers. This was caused by TTP URL links being incorrectly categorized as unknown, resulting in clean links being redirected through Browser Isolation and, in some cases, returning an error. We are now seeing a sustained reduction in Browser Isolation requests and believe service should be returning to normal. We will continue to monitor performance closely and provide further updates as they become availab

Read the full incident report →

Minor May 13, 2026

Administration Console Loading Issues

Detected by Pingoru
May 13, 2026, 12:48 AM UTC
Resolved
May 13, 2026, 02:01 AM UTC
Duration
1h 13m
Affected: South African GridOffshore Grid (Administration Console)
Timeline · 1 update
  1. investigating May 13, 2026, 12:48 AM UTC

    We are aware that some customers hosted on our ZA grid may be experiencing intermittent issues accessing the Mimecast Administration Console. Our engineering team is actively investigating the issue and we will provide further updates as they become available.

Read the full incident report →

Minor May 9, 2026

DE Grid - Degraded service impacting Cybergraph and other services

Detected by Pingoru
May 09, 2026, 08:45 AM UTC
Resolved
May 10, 2026, 08:00 PM UTC
Duration
1d 11h
Affected: German GridOffshore Grid (Email Processing)
Timeline · 4 updates
  1. investigating May 09, 2026, 08:45 AM UTC

    We are aware that some customers hosted on our German (DE) grid may be experiencing degraded service affecting Cybergraph and other services. We are currently investigating the issue, and updates will be posted here as they become available.

  2. identified May 09, 2026, 09:40 AM UTC

    We have identified the issue affecting Cybergraph and other services in the German (DE) grid and are working to resolve it. We will provide further updates as they become available.

  3. monitoring May 09, 2026, 10:34 AM UTC

    We have taken mitigation steps and believe the service degradation issue affecting Cybergraph and other services in the German (DE) grid has been resolved. We are closely monitoring performance and will provide further updates as they become available.

  4. monitoring May 09, 2026, 07:31 PM UTC

    We have taken mitigation steps and believe the service degradation issue affecting Cybergraph and other services in the German (DE) grid has been resolved. We are closely monitoring performance and will provide further updates as they become available.

Read the full incident report →