Mimecast Outage History
13 incidents recorded over the last 365 days, 13 of them resolved. Durations are measured from when PulsAPI first saw the problem to when it cleared, which is usually longer than the vendor's own figure.
Every Recorded Mimecast Incident
| Date | Incident | Duration | Status |
|---|---|---|---|
| Oct 23, 2026 | SMS Delivery Issue - ZA 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… | 309h 19m | Resolved |
| Oct 17, 2026 | South Africa Region – Email Processing Delays and Service Access IssuesWe 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… | 4h 6m | Resolved |
| Oct 14, 2026 | Degraded access to Mimecast Support CenterWe 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… | 6h 35m | Resolved |
| Oct 12, 2026 | Login issues on the new universal login pageWe 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… | 2h 57m | Resolved |
| Oct 7, 2026 | SMS delivery delaysOur 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… | 1h 34m | Resolved |
| Sep 9, 2026 | ZA Support Line (086) issue 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… | 30h 23m | Resolved |
| Sep 4, 2026 | Email Delivery Delays to O365We 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… | 4h 40m | Resolved |
| Sep 3, 2026 | Degraded Service – Aware login issues on US GridWe 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. | 37 min | Resolved |
| Sep 2, 2026 | Service Disruption and Mail Delivery DelaysWe 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… | 2h 43m | Resolved |
| Sep 1, 2026 | Degraded Service – Mimecast platform authentication and POP3 access issues.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… | 33h 20m | Resolved |
| Aug 24, 2026 | Secure Messaging LoginWe 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. | 5h 6m | Resolved |
| Aug 24, 2026 | Degraded Service – Administration Console Authentication issueWe 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… | 1h 33m | Resolved |
| Aug 21, 2026 | Aware, Analysis and Response, Human Risk Command Center, Engage, and CyberGraph : Login/Access Issues (AU, CA)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… | 1h 9m | Resolved |
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How to Read This Mimecast Incident Log
Each row is an incident PulsAPI observed, not a summary written afterwards. The duration is wall-clock time between the first failing check and the first clean one, so it includes the window before Mimecast acknowledged anything. Vendor post-mortems typically measure from acknowledgement, which is why their numbers are usually shorter.
Incidents still open have no duration yet and are listed as ongoing rather than being given a running total. The archive covers the last 365 days; anything older has aged out of the window rather than never having happened.
The longest single Mimecast outage in this window ran 12d 21h, against a mean recovery of 1d 7h. If you depend on Mimecast in a customer-facing path, the longest figure is the one to design around. The mean is what happens on a normal bad day; the maximum is what happens on the worst one.