Mimecast Outage History
Uptime record, past incidents, and downtime history for Mimecast.
Checking current status...
90-Day Trend
Monthly Uptime
| Month | Uptime | Days Tracked | Days with Issues |
|---|---|---|---|
| July 2026 | 100% | 9 | 0 |
| June 2026 | 70% | 30 | 9 |
| May 2026 | 77.4% | 31 | 7 |
| April 2026 | 81% | 21 | 4 |
Uptime is calculated from daily worst-status snapshots. A day with any non-operational status counts as a day with issues.
Daily Status (Last 91 Days)
Apr 10
Today
Operational
Degraded
Partial Outage
Major Outage
Maintenance
No Data
Incident History
June 2026
SMS delivery delays
Started: Jun 25, 12:51 PM
investigating
Our third-party SMS provider has confirmed that the service incident impacting the delivery of Two-Factor Authentication (2FA) SMS messages has been resolved. All SMS messages are now being delivered successfully.
We will continue to monitor the situation to ensure system stability and consistent message delivery.
Jun 25, 1:56 PM
monitoring
Our third-party SMS provider has reported an issue that may impact the successful delivery of SMS messages used for Two-Factor Authentication (2FA). The provider is actively working on a resolution, and we will provide updates as they become available.
Jun 25, 12:51 PM
SMS delivery delays
Started: Jun 24, 3:27 PM
investigating
Our third-party SMS provider has resolved their incident and confirmed full service restoration. SMS delivery, including 2FA codes, should now be back to normal. Any messages delayed during the incident window have been processed.
We are monitoring to confirm full recovery on our end and will close this incident within 60 minutes if no further issues are observed.
Jun 24, 5:20 PM
monitoring
We have identified the root cause of the SMS delivery issue currently affecting some Mimecast customers. Our third-party SMS provider has confirmed the root cause and their engineering team is actively working on a solution.
SMS messages processed during the incident window may experience delays and will be reprocessed once services are fully restored.
Impact: SMS message delivery to recipients may be delayed or unsuccessful, including 2FA authentication codes sent via SMS.
Services affe...
Jun 24, 4:07 PM
monitoring
We are currently investigating an issue affecting the delivery of SMS messages to recipients. Some customers may experience delays or failures when Mimecast attempts to deliver SMS notifications.
We have identified a potential issue with one of our third-party SMS delivery provider and are actively working with them to determine the root cause and restore full service.
Impact: SMS message delivery to recipients may be delayed or unsuccessful.
Services affected: SMS notifications and aler...
Jun 24, 3:27 PM
Degraded service impacting Partner Administration Console access
Started: Jun 18, 4:09 PM
investigating
We have taken mitigation steps and believe we have resolved the issue impacting access to the Administration Console via the Partner Portal globally.
All services should now be functioning normally. Our Engineering team will continue to closely monitor application availability and performance. We will provide further updates here if necessary.
Jun 18, 8:18 PM
monitoring
We are continuing to investigate the service disruption impacting Partner Administrators. Administrators are able to successfully log into the Partner Portal; however, when attempting to access customer Administration Consoles via the Partner Portal, they are being logged out.
Our engineering teams remain actively engaged in the investigation. Further updates will be posted here as they become available.
Jun 18, 7:37 PM
monitoring
We are aware that some Partner Administrators may be experiencing a login loop when attempting to access the Administration Console. We are currently investigating this issue and will post further updates here as they become available.
Jun 18, 4:09 PM
Administration console access issue
Started: Jun 18, 9:51 AM
investigating
We have implemented mitigation steps and believe we have resolved the intermittent issues affecting access to the Mimecast Administration Console for customers hosted on our UK, DE, and ZA grids. Our Engineering team is closely monitoring the situation to ensure a full resolution.
Jun 18, 11:43 AM
monitoring
We have identified the cause of the intermittent issues affecting customers hosted on our UK, DE, and ZA grids experiencing difficulty accessing the Mimecast Administration Console. Our Engineering team is actively working on implementing a fix and we will provide further updates as they become available.
Jun 18, 11:08 AM
monitoring
We are aware that some customers hosted on our UK, DE and 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.
Jun 18, 9:51 AM
Email Delivery Delays | ZA Grid
Started: Jun 9, 9:42 AM
investigating
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.
Jun 9, 10:09 AM
monitoring
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.
Jun 9, 9:57 AM
monitoring
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.
Jun 9, 9:42 AM
Email delivery delays on US grid
Started: Jun 9, 1:45 AM
monitoring
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.
Jun 9, 3:26 AM
monitoring
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.
Jun 9, 2:31 AM
monitoring
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.
Jun 9, 1:45 AM
Degraded performance on US grid
Started: Jun 6, 3:41 AM
monitoring
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.
Jun 6, 5:54 AM
monitoring
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.
Jun 6, 5:04 AM
monitoring
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.
Jun 6, 3:41 AM
Degraded Service – Partner Portal Access
Started: Jun 1, 9:32 PM
monitoring
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.
Jun 1, 9:32 PM
May 2026
German (DE) Mail Processing Degraded
Started: May 26, 1:37 PM
investigating
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.
May 26, 1:54 PM
monitoring
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.
May 26, 1:37 PM
Degraded service for SAML authentication on US, USB and UK Grids
Started: May 19, 4:38 PM
investigating
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.
May 19, 5:23 PM
monitoring
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.
May 19, 4:58 PM
monitoring
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.
May 19, 4:38 PM
TTP URL and Browser Isolation Errors on US and USB Grids
Started: May 19, 1:59 PM
investigating
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...
May 19, 3:05 PM
monitoring
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.
May 19, 1:59 PM
Administration Console Loading Issues
Started: May 13, 12:48 AM
monitoring
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.
May 13, 12:48 AM
DE Grid - Degraded service impacting Cybergraph and other services
Started: May 9, 8:45 AM
investigating
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.
May 9, 7:31 PM
monitoring
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.
May 9, 10:34 AM
monitoring
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.
May 9, 9:40 AM
monitoring
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.
May 9, 8:45 AM
April 2026
Aware 1.0 Performance Issue
Started: Apr 24, 3:38 PM
investigating
We are observing sustained service improvements, and Mimecast telemetry is showing the error rate has returned to baseline. Customers should see normal processing and application accessibility, although there may be minor delays as any residual backlog clears.
Our Engineering team continues to closely monitor availability and performance.
Apr 24, 11:45 PM
monitoring
Following our earlier update, mitigation actions have been implemented by Microsoft in relation to the underlying platform disruption impacting the East US region.
We are seeing improved performance for customers on the Aware 1.0 platform; however, there may still be intermittent delays or retries while the environment fully stabilises.
Our Engineering team continues to closely monitor performance and recovery. We will provide further updates here as they become available.
Apr 24, 8:51 PM
monitoring
We have identified an issue affecting some customers on the Aware 1.0 platform, resulting in delays and retries. This has been attributed to an underlying Azure platform disruption. Our Engineering teams are actively engaged with Microsoft to remediate this as quickly as possible.
Apr 24, 3:38 PM
Administration Console Loading Issues
Started: Apr 23, 3:06 AM
monitoring
We are aware that some customers hosted on our AU 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.
Apr 23, 3:06 AM
Automatic Threat Remediation non-actionable alerts
Started: Apr 10, 10:24 PM
investigating
We are aware that some customers have been receiving alerts for Threat Remediation jobs that do not correspond to actionable items in the Administration Console. Customers in this situation can consider these non-actionable alerts, with no existing threats to remediate. We have identified the underlying cause and have deployed a corrective update. There will continue to be some alerts based on previously identified patterns that will be cleared over time.
Apr 10, 10:24 PM