Mimecast Outage History

Started Oct 17, 2026, 12:01 PM UTC· resolved Oct 17, 2026, 04:15 PM UTC

1. investigating Oct 17, 2026, 12:01 PM UTC

   We are aware that some customers hosted in our South Africa region may be experiencing intermittent email processing delays and issues accessing some Mimecast services. We are investigating and will provide updates here as soon as more information is available.

2. monitoring Oct 17, 2026, 12:51 PM UTC

   A fix has been implemented for the intermittent email processing delays and service access issues in our South Africa region. We are monitoring the service and will provide updates here as soon as more information is available.

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Started Oct 14, 2026, 06:21 PM UTC· resolved Oct 15, 2026, 01:09 AM UTC

1. investigating Oct 14, 2026, 06:21 PM UTC

   We are aware that some customers may be experiencing issues logging in to the Mimecast Support Center when accessing it directly. We are currently investigating and will post updates here as they become available. Please note that customers can access the Mimecast Support Center by selecting Contact Support in the Administration Console, which is functioning as expected.

2. identified Oct 14, 2026, 10:05 PM UTC

   We have identified the cause of login issues when accessing the Mimecast Support Center, affecting some customers. Our teams are taking mitigating steps to address the issue and are working to deploy a fix. We will provide further updates as they become available. Please note that customers can continue to access the Mimecast Support Center by selecting Contact Support in the Administration Console, which is functioning as expected.

3. monitoring Oct 14, 2026, 11:58 PM UTC

   We have implemented mitigation steps to address the login issues when accessing the Mimecast Support Center and Mimecast University directly. We are no longer seeing errors and services are operating normally. Our Engineering team will continue to closely monitor availability and performance to ensure ongoing stability.

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Started Oct 12, 2026, 02:51 PM UTC· resolved Oct 12, 2026, 06:03 PM UTC

1. identified Oct 12, 2026, 02:51 PM UTC

   We are aware of an issue affecting login to the Mimecast services for some customers globally. Users may see an error after entering a valid username and may be unable to reach the password step. We have identified the cause, and our teams are actively working on a resolution. We apologize for the disruption and will post further updates here as they become available.

2. identified Oct 12, 2026, 03:02 PM UTC

   We are aware of an issue affecting login to the Mimecast services for some customers globally. Users may see an error after entering a valid username and may be unable to reach the password step. We have identified the cause, and our teams are actively working on a resolution. We apologize for the disruption and will post further updates here as they become available. As a workaround, please refer to below article to successfully login via respective regional URLs https://mimecastsupport.zendesk.com/hc/en-us/articles/34000362728979-Administration-Data-Centers-URLs#h_01JA7Q71GA0422N2D8BE4J0Z36

3. monitoring Oct 12, 2026, 05:18 PM UTC

   We have implemented mitigation steps to address the login issues affecting some customers globally. We are no longer seeing errors, and users should now be able to log in through the Mimecast login page as normal. Our Engineering team will continue to closely monitor availability and performance to ensure ongoing stability.

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Started Oct 07, 2026, 08:49 AM UTC· resolved Oct 07, 2026, 11:01 AM UTC

1. identified Oct 07, 2026, 08:49 AM UTC

   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.

2. monitoring Oct 07, 2026, 09:56 AM UTC

   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.

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Started Sep 09, 2026, 01:35 PM UTC· resolved Sep 10, 2026, 08:07 PM UTC

1. investigating Sep 09, 2026, 01:35 PM UTC

   We are aware that some customers may be experiencing an issue with calls to our South Africa (ZA) support line 086 not ringing. In the meantime, customers can alternatively contact us on (011) 722-3700. We are currently investigating and will post updates here as they become available.

2. identified Sep 09, 2026, 03:34 PM UTC

   We have identified the cause of the issue preventing calls from connecting on our South Africa (ZA) support line 086. Our teams are actively working towards a resolution, and we will share further updates here as they become available. In the meantime, customers can continue using the alternative number, (011) 722-3700.

3. identified Sep 09, 2026, 05:08 PM UTC

   We have identified the cause of the issue preventing calls from connecting on our South Africa (ZA) support line 086, and our teams are actively working towards a resolution. In the meantime, please use the alternative number, (011) 722-3700, until further notice. We expect to share our next update during normal ZA business hours.

4. identified Sep 10, 2026, 10:36 AM UTC

   We continue to work actively towards a resolution for the issue preventing calls from connecting on our South Africa (ZA) support line 086. We will share further updates here as soon as we have more information. In the meantime, please continue using the alternative number, (011) 722-3700, until further notice.

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Started Sep 04, 2026, 10:55 AM UTC· resolved Sep 04, 2026, 03:51 PM UTC

1. monitoring Sep 04, 2026, 10:55 AM UTC

   We are aware that some customers may be experiencing email delays, with some seeing an increased volume of emails on their delivery queue. Our investigation shows that this issue is impacting emails to Office 365, coinciding with an incident reported by Office 365 on their end. We will continue monitoring and will post updates here as they become available.

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Started Sep 03, 2026, 01:36 PM UTC· resolved Sep 03, 2026, 02:25 PM UTC

1. investigating Sep 03, 2026, 01:36 PM UTC

   We are aware that some customers hosted on our US grid may be experiencing login issues with Aware. We are currently investigating and will post updates here as they become available.

2. monitoring Sep 03, 2026, 01:43 PM UTC

   We have implemented mitigation steps to address login issues for some customers hosted on our US grid, impacting Aware. We are no longer seeing errors and services are operating normally. Our Engineering team(s) will continue to closely monitor availability and performance to ensure ongoing stability.

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Started Sep 02, 2026, 06:51 PM UTC· resolved Sep 02, 2026, 09:45 PM UTC

1. identified Sep 02, 2026, 06:51 PM UTC

   We have identified the cause of a service disruption affecting some customers hosted on our JER grid, which may be impacting authentication and mail flow. We continue to accept mail like normal but processing and delivery may be delayed. Our teams are actively working on a resolution, and further updates will be posted here as they become available.

2. monitoring Sep 02, 2026, 08:31 PM UTC

   We have implemented mitigation steps to address the service disruption affecting some customers hosted on our JER grid, including issues with authentication and mail flow. We are no longer seeing errors and mail processing and delivery are operating normally. Our Engineering team will continue to closely monitor availability and performance to ensure ongoing stability.

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Started Sep 01, 2026, 01:03 AM UTC· resolved Sep 02, 2026, 10:31 AM UTC

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.

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Started Aug 24, 2026, 06:25 PM UTC· resolved Aug 25, 2026, 12:18 AM UTC

1. investigating Aug 24, 2026, 06:25 PM UTC

   We are aware that some customers may be having their external users experience login issues with Secure Messaging. We are currently investigating and will post updates here as they become available.

2. investigating Aug 24, 2026, 08:17 PM UTC

   We are continuing to actively investigate login issues affecting some customers' external users with Secure Messaging. Our teams remain fully engaged in troubleshooting to identify the root cause, and we will post updates here as they become available.

3. identified Aug 24, 2026, 10:55 PM UTC

   We have implemented mitigation steps to address authentication issues for external Secure Messaging users. We are seeing improvements across grids and are continuing to test and apply mitigations to the authentication service. We will provide further updates as they become available.

4. monitoring Aug 24, 2026, 11:01 PM UTC

   We have implemented mitigation steps to address authentication issues for external Secure Messaging users. We are no longer seeing errors and services are operating normally across grids. Our Engineering team will continue to closely monitor availability and performance to ensure ongoing stability.

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Started Aug 24, 2026, 03:08 PM UTC· resolved Aug 24, 2026, 04:47 PM UTC

1. identified Aug 24, 2026, 03:08 PM UTC

   We have identified the cause of authentication issues affecting the Administration Console for some customers globally. 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.

2. identified Aug 24, 2026, 03:09 PM UTC

   We have identified the cause of authentication issues affecting the Administration Console for some customers. Expect to see intermittent failures and high latency. 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 Aug 24, 2026, 03:18 PM UTC

   We have taken mitigation steps and believe we have resolved the issue causing login failures and disruption to Administration Console for some customers across multiple regions. Our Engineering team is closely monitoring the situation as services continue to stabilize and return to normal levels. We will provide further updates here.

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Started Aug 21, 2026, 02:04 PM UTC· resolved Aug 21, 2026, 03:37 PM UTC

1. identified Aug 21, 2026, 02:04 PM UTC

   We have identified the cause of intermittent login and access issues affecting some customers hosted on our AU and CA grids, impacting Aware, Analysis and Response, Human Risk Command Center, Engage, and CyberGraph. Our teams are actively working on the resolution, and further updates will be posted here as they become available.

2. monitoring Aug 21, 2026, 02:20 PM UTC

   We have implemented mitigation steps to address login and access issues for some customers hosted on our AU and CA grids, impacting Aware, Analysis and Response, Human Risk Command Center, Engage, and CyberGraph. We are no longer seeing errors and services are operating normally. Our Engineering team continues to closely monitor availability and performance to ensure ongoing stability.

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Started Jul 27, 2026, 06:03 AM UTC· resolved Jul 27, 2026, 04:18 PM UTC

1. investigating Jul 27, 2026, 06:03 AM UTC

   We are aware that some customers on our AU grid may be experiencing outbound mail delivery delays due to MX lookup errors, with messages held in the delivery queue. We are investigating and will post updates here as they become available.

2. identified Jul 27, 2026, 06:40 AM UTC

   We have identified the issue causing outbound MX lookup errors for a subset of AU-hosted customers and are working on a resolution. We'll provide further updates as they become available.

3. monitoring Jul 27, 2026, 07:28 AM UTC

   We have applied mitigation steps to resolve the issue causing outbound MX lookup errors for a subset of AU-hosted customers. Some outbound mail may still be delayed while the backlog clears. We're monitoring closely to confirm full recovery and will provide further updates as they become available.

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Started Jul 23, 2026, 04:11 PM UTC· resolved Jul 24, 2026, 06:54 PM UTC

1. investigating Jul 23, 2026, 04:11 PM UTC

   We are aware that some customers hosted on our USB grid may be experiencing intermittent delivery delays. We are currently investigating and will post updates here as they become available.

2. identified Jul 23, 2026, 04:47 PM UTC

   We have identified the cause of the intermittent delivery delays affecting some customers hosted on our USB grid. Our teams are actively working on a resolution, and further updates will be posted here as they become available.

3. identified Jul 23, 2026, 09:39 PM UTC

   We have implemented mitigation steps to address intermittent delivery delays for some customers hosted on our USB grid. Our teams are seeing improvements and are continuing to work toward full resolution. We will provide further updates as they become available.

4. monitoring Jul 24, 2026, 01:36 AM UTC

   We have implemented mitigation steps to address intermittent delivery delays for some customers hosted on our USB grid. Our processing queues are in a healthier state, and we are observing normal mail delivery operations. Our Engineering teams will continue monitoring to ensure stability in our environment.

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Started Jul 23, 2026, 09:52 AM UTC· resolved Jul 23, 2026, 07:01 PM UTC

1. investigating Jul 23, 2026, 09:52 AM UTC

   We are aware that some customers may be experiencing an issue when attempting to load certain pages within the Mimecast Administration Console, resulting in a redirect back to the Main Page. We are currently investigating the issue and updates will be posted here as they become available.

2. identified Jul 23, 2026, 10:33 AM UTC

   We have identified the cause of the issue affecting the loading of certain pages within the Mimecast Administration Console. Our teams are working on implementing remediation to resolve the issue, and further updates will be posted here as they become available.

3. identified Jul 23, 2026, 12:03 PM UTC

   We continue to work on a resolution for the issue affecting some customers, where attempting to load certain pages within the Mimecast Administration Console redirects back to the Main Page. We will continue to provide updates here as they become available.

4. identified Jul 23, 2026, 02:19 PM UTC

   Our Engineering teams are actively engaged implementing mitigation steps to resolve the issue affecting some customers, where attempting to load certain pages within the Mimecast Administration Console redirects back to the Main Page. We will continue to provide updates here as they become available.

5. monitoring Jul 23, 2026, 05:11 PM UTC

   We have taken mitigation steps and believe we have resolved the issue affecting some customers where attempting to load certain pages within the Mimecast Administration Console redirected users back to the Main Page. Our Engineering team is closely monitoring the situation to ensure continued stability and performance. We will provide further updates here as they become available.

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Started Jul 23, 2026, 05:39 AM UTC· resolved Jul 23, 2026, 11:28 AM UTC

1. investigating Jul 23, 2026, 05:39 AM UTC

   We are aware that some customers hosted on our AU grid may be experiencing intermittent delivery delays, with messages being held in the processing queue. We are currently investigating and will post updates here as they become available.

2. identified Jul 23, 2026, 06:33 AM UTC

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

3. monitoring Jul 23, 2026, 07:09 AM UTC

   Recovery is ongoing for the incident affecting some customers on our AU grid and we continue to see improvements. There may still be some delays in mail flow as the backlog clears. We are closely monitoring performance and will provide further updates as they become available.

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Started Jul 22, 2026, 04:28 PM UTC· resolved Jul 22, 2026, 10:04 PM UTC

1. investigating Jul 22, 2026, 04:28 PM UTC

   We are aware of a service disruption that is preventing customers from completing S&R migrations. We are currently investigating the issue and will post further updates here as they become available

2. identified Jul 22, 2026, 05:29 PM UTC

   We have identified the root cause of the issue preventing customers from completing Sync and Recover (S&R) migrations. Our engineering team is actively working on a resolution. We will post further updates here as they become available.

3. monitoring Jul 22, 2026, 07:28 PM UTC

   We can confirm that we have taken mitigation steps and believe we have resolved the earlier issue that prevented customers from completing Sync and Recover (S&R) migrations. Our Engineering team is closely monitoring the environment, and services are operating as expected.

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Started Jul 17, 2026, 02:56 PM UTC· resolved Jul 20, 2026, 04:15 PM UTC

1. investigating Jul 17, 2026, 02:56 PM UTC

   We are aware that some customers hosted on our USB 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.

2. identified Jul 17, 2026, 03:47 PM UTC

   We have identified the cause of the intermittent issues affecting customers hosted on our USB 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.

3. monitoring Jul 17, 2026, 04:30 PM UTC

   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 USB grid. Our Engineering team is closely monitoring the situation to ensure a full resolution.

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Started Jul 14, 2026, 03:49 PM UTC· resolved Jul 15, 2026, 10:36 AM UTC

1. investigating Jul 14, 2026, 03:49 PM UTC

   We are aware of a service disruption impacting outbound email processing for some customers across multiple grids. Some outbound messages delivered to external recipients may contain a blank or incorrect message body. Our Engineering team is actively investigating to mitigate the issue. Further updates will be posted here as they become available. All other Mimecast services are operating as normal.

2. investigating Jul 14, 2026, 04:05 PM UTC

   We are aware of a service disruption impacting outbound email processing for some customers across multiple grids. Some outbound messages delivered to external recipients may contain a blank or "null" display in the body. Our Engineering team is actively working to determine the root cause and scope of impact. Further updates will be posted here as they become available. All other Mimecast services are operating as normal.

3. identified Jul 14, 2026, 05:43 PM UTC

   We believe we have identified the issue affecting customers across multiple grids, where some outbound messages were delivered with a blank or "null" message body. We have taken initial mitigation steps and are seeing error rate improvements in impacted regions. The Engineering team will continue the mitigation process while closely monitoring performance. Customers may still experience intermittent issues while mitigation work continues. We will provide further updates here as they become available.

4. monitoring Jul 14, 2026, 09:40 PM UTC

   We have taken mitigation steps and believe we have solved the issue of our recent service disruption that impacted outbound email processing across all regions. The Engineering team will closely monitor as the error rates have returned to normal levels. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

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Started Jul 14, 2026, 06:07 AM UTC· resolved Jul 14, 2026, 09:30 AM UTC

1. investigating Jul 14, 2026, 06:07 AM UTC

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

2. investigating Jul 14, 2026, 06:27 AM UTC

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

3. monitoring Jul 14, 2026, 06:34 AM UTC

   We can confirm that email processing services in the Australia region have been restored. We will continue to closely monitor performance but email services should now be functioning normally.

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Started Jun 25, 2026, 12:51 PM UTC· resolved Jun 25, 2026, 03:05 PM UTC

1. identified Jun 25, 2026, 12:51 PM UTC

   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.

2. monitoring Jun 25, 2026, 01:56 PM UTC

   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.

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Started Jun 18, 2026, 04:09 PM UTC· resolved Jun 18, 2026, 09:02 PM UTC

1. investigating Jun 18, 2026, 04:09 PM UTC

   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.

2. investigating Jun 18, 2026, 07:37 PM UTC

   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.

3. monitoring Jun 18, 2026, 08:18 PM UTC

   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.

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Started Jun 18, 2026, 09:51 AM UTC· resolved Jun 18, 2026, 03:13 PM UTC

1. investigating Jun 18, 2026, 09:51 AM UTC

   We are aware that some customers hosted on our UK and DE 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.

2. identified Jun 18, 2026, 11:08 AM UTC

   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.

3. monitoring Jun 18, 2026, 11:43 AM UTC

   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.

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Started Jun 09, 2026, 09:42 AM UTC· resolved Jun 09, 2026, 01:08 PM UTC

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.

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Started Jun 09, 2026, 01:45 AM UTC· resolved Jun 09, 2026, 04:04 AM UTC

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.

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