Mimecast outage history

September 4, 2026 10:55AM UTC Monitoring - 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. September 4, 2026 3:41PM UTC Resolved - We can confirm that the email delivery delays affecting some customers, resulting from an incident affecting Office 365, have been fully resolved. Delivery queues have returned to normal levels and mail flow is operating as expected. We appreciate your patience during this time.

September 3, 2026 1:36PM UTC Investigating - 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. September 3, 2026 1:43PM UTC Monitoring - 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. September 3, 2026 2:12PM UTC Resolved - We can confirm that the login issues affecting some customers hosted on our US grid, impacting Aware, have been fully resolved. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

September 2, 2026 6:51PM UTC Identified - 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. September 2, 2026 8:31PM UTC Monitoring - 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. September 2, 2026 9:38PM UTC Resolved - We can confirm that the service disruption affecting some customers, including issues with authentication and mail flow, has been fully resolved. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

September 1, 2026 1:03AM UTC Investigating - 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. September 1, 2026 2:04AM UTC Identified - 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. September 1, 2026 3:22AM UTC Monitoring - 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. September 1, 2026 6:34AM UTC Monitoring - 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. September 1, 2026 9:43AM UTC Monitoring - 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. September 1, 2026 1:59PM UTC Identified - 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. September 2, 2026 6:34AM UTC Monitoring - 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. September 2, 2026 10:28AM UTC Resolved - We can confirm that the issue with Administration Console, End User apps and POP3 has been resolved. We appreciate your patience while we resolved this problem.

August 24, 2026 6:25PM UTC Investigating - 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. August 24, 2026 8:17PM UTC Investigating - 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. August 24, 2026 10:55PM UTC Identified - 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. August 24, 2026 11:01PM UTC Monitoring - 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. August 25, 2026 12:13AM UTC Resolved - We can confirm that the authentication issues affecting external Secure Messaging users have been fully resolved. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

August 24, 2026 3:08PM UTC Identified - 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. August 24, 2026 3:09PM UTC Identified - 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. August 24, 2026 3:18PM UTC Monitoring - 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. August 24, 2026 4:45PM UTC Resolved - We can confirm that the login failures and disruption to Administration Console affecting some customers across multiple regions have been fully resolved. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

August 21, 2026 2:04PM UTC Identified - 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. August 21, 2026 2:20PM UTC Monitoring - 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. August 21, 2026 3:34PM UTC Resolved - We can confirm that the 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, have been fully resolved. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

July 27, 2026 6:03AM UTC Investigating - 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. July 27, 2026 6:40AM UTC Identified - 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. July 27, 2026 7:28AM UTC Monitoring - 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. July 27, 2026 4:07PM UTC Resolved - We can confirm resolution of the issue that was causing outbound MX lookup errors for a subset of AU-hosted customers. Mail flow has fully recovered and services are now operating normally. We appreciate your patience while we addressed this issue.

July 23, 2026 4:11PM UTC Investigating - 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. July 23, 2026 4:47PM UTC Identified - 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. July 23, 2026 9:39PM UTC Identified - 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. July 24, 2026 1:36AM UTC Monitoring - 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. July 24, 2026 6:52PM UTC Resolved - We can confirm that email processing and all Mimecast services have been restored for customers hosted on our USB grid. All services should now be functioning normally. We appreciate your patience while we worked to resolve this issue.

July 23, 2026 9:52AM UTC Investigating - 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. July 23, 2026 10:33AM UTC Identified - 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. July 23, 2026 12:03PM UTC Identified - 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. July 23, 2026 2:19PM UTC Identified - 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. July 23, 2026 5:11PM UTC Monitoring - 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. July 23, 2026 6:50PM UTC Resolved - We can confirm that we have resolved the issue for some customers being redirected to the Main Page when attempting to access certain pages within the Mimecast Administration Console. All services should now be functioning normally. We appreciate your patience as we worked to resolve this issue.

July 23, 2026 5:39AM UTC Investigating - 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. July 23, 2026 6:33AM UTC Identified - 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. July 23, 2026 7:09AM UTC Monitoring - 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. July 23, 2026 11:25AM UTC Resolved - The incident affecting some customers on our AU grid has now been resolved. Mail flow has returned to normal and the backlog has fully cleared. Thank you for your patience while we worked to resolve this incident.

July 22, 2026 4:28PM UTC Investigating - 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 July 22, 2026 5:29PM UTC Identified - 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. July 22, 2026 7:28PM UTC Monitoring - 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. July 22, 2026 9:56PM UTC Resolved - We can confirm that we have resolved the earlier issue that prevented customers from completing Sync and Recover (S&R) migrations. All regions are now operating normally, and services have been fully restored. We appreciate your patience while we worked to resolve this issue.

July 17, 2026 2:56PM UTC Investigating - 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. July 17, 2026 3:47PM UTC Identified - 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. July 17, 2026 4:30PM UTC Monitoring - 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. July 20, 2026 4:07PM UTC Resolved - We can confirm that we have resolved the issue affecting access to the Mimecast Administration Console for customers hosted on our US-B grid. Following continued monitoring throughout the weekend, no further issues have been observed and services are operating as expected. All services should now be functioning normally. We appreciate your patience while we worked to resolve this problem.

July 14, 2026 3:49PM UTC Investigating - 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. July 14, 2026 4:05PM UTC Investigating - 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. July 14, 2026 5:43PM UTC Identified - 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. July 14, 2026 9:40PM UTC Monitoring - 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. July 15, 2026 10:31AM UTC Resolved - We can confirm that email processing have been restored across all regions. All services should now be functioning normally. We appreciate your patience while we resolved this problem.

July 14, 2026 6:07AM UTC Investigating - 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. July 14, 2026 6:27AM UTC Investigating - 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. July 14, 2026 6:34AM UTC Monitoring - 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. July 14, 2026 9:24AM UTC Resolved - We can confirm that we have resolved the issue of email delivery delays for customers in the Australia region. We appreciate your patience during this issue.

June 22, 2026 6:45PM UTC Scheduled - We will be performing scheduled maintenance on our AU grid on Friday, 10th July 2026, from 10:00 AM – 02:00 PM UTC. During this maintenance window, we do not anticipate any disruption to your service, and all services should continue to operate as normal. However, in the unlikely event of any brief interruption, please be assured that no emails will be lost. Our teams will be working to complete all activity within the scheduled timeframe. Should any updates be required, they will be posted here on the Mimecast Service Status Page. If you have any questions, please contact the Mimecast Support team. July 10, 2026 10:00AM UTC Active - Scheduled maintenance is starting. July 10, 2026 2:00PM UTC Completed - Scheduled maintenance is complete.

June 25, 2026 12:51PM UTC Identified - 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. June 25, 2026 1:56PM UTC Monitoring - 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. June 25, 2026 2:59PM UTC Resolved - Our third-party SMS provider has confirmed that the service incident affecting delivery of Two-Factor Authentication (2FA) SMS messages has been resolved, and that SMS messages are now being delivered successfully. We appreciate your patience while we worked to resolve this issue.

June 24, 2026 3:27PM UTC Investigating - 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 alerts Other Mimecast services are not affected by this issue. June 24, 2026 4:07PM UTC Identified - 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 affected: SMS notifications and 2FA via SMS Other Mimecast services are not affected by this issue. We will provide a further updates here. June 24, 2026 5:20PM UTC Monitoring - 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. June 24, 2026 6:17PM UTC Resolved - This incident has been resolved. Our third-party SMS provider confirmed full restoration of their service, and we have verified that SMS delivery, including 2FA codes, is operating normally on the Mimecast side. We apologise for any inconvenience this may have caused.

June 18, 2026 4:09PM UTC Investigating - 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. June 18, 2026 7:37PM UTC Investigating - 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. June 18, 2026 8:18PM UTC Monitoring - 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. June 18, 2026 9:00PM UTC Resolved - We can confirm that we have resolved the issue of degraded access to the Administration Console via the Partner Portal. All services should now be functioning normally. We appreciate your patience as we worked to resolve this issue.

June 18, 2026 9:51AM UTC Investigating - 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. June 18, 2026 11:08AM UTC Identified - 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. June 18, 2026 11:43AM UTC Monitoring - 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. June 18, 2026 3:03PM UTC Resolved - We can confirm that we have resolved the issue affecting access to the Mimecast Administration Console for customers hosted on our UK, DE, and ZA grids. We appreciate your patience while we resolved this problem.