Mimecast Outage History

Mimecast's Aware 1.0 platform experienced performance issues for 8.1 hours, causing delays and retries for some customers due to an underlying Azure platform disruption in the East US region. Mimecast's engineering teams worked with Microsoft to implement mitigation actions, which improved performance though some intermittent delays continued while the environment stabilized. The incident was resolved through Microsoft's platform fixes and ongoing monitoring by Mimecast's engineering team.

Mimecast customers on the Australian Grid experienced intermittent issues accessing the Administration Console for 1.7 hours. The engineering team investigated and resolved the loading problems that prevented administrators from accessing the console interface.

Mimecast's German (DE) grid experienced degraded performance for 1.3 hours, affecting email processing and access to the administration console for customers hosted in that region. The service team identified the root cause of the degradation and worked to resolve the issue. The incident was classified as minor severity and has since been resolved.

Mimecast experienced a 2.3-hour service incident where customers using two-factor authentication (2FA) were unable to log into the administration console across all global grids including the US, UK, Australia, Canada, Germany, and South Africa. The issue was identified as a problem with the 2FA authentication system, and Mimecast implemented mitigation steps that restored login functionality for affected customers.

Mimecast's US-B infrastructure experienced service degradation affecting Administration Console access, Directory Sync, Sync & Recover, and Remediation for Azure connections for 1.6 hours. API-based protection customers also experienced delays in message processing and remediation, potentially leaving threats temporarily in Microsoft 365 inboxes. The team identified the root cause and worked on a resolution.

A small subset of Mimecast customers on the US-B grid experienced email delivery delays, with messages being deferred and held in processing queues. The issue was identified by Mimecast's engineering team and resolved after 56 minutes of service disruption.

Mimecast experienced DNS resolution failures on their US-B grid that caused degraded email deliverability for affected customers. The issue lasted 4.7 hours and impacted customers with temporary DNS record lookup errors. The problem was identified and mitigated, with DNS resolution performance gradually improving as the fixes took effect.

Mimecast experienced SMS verification code delivery failures specifically affecting customers with Belgian and French phone numbers across all global grids. The issue lasted approximately 7 days and was related to problems with their SMS provider. Mimecast worked with the SMS provider to restore delivery and recommended customers use alternative two-factor authentication methods like authenticator apps during the outage.

Mimecast customers on the UK grid experienced intermittent issues accessing the Administration Console for 32 minutes. The engineering team investigated and resolved the loading problems that prevented administrators from accessing the management interface.

Mimecast experienced SMS delivery failures affecting all customers with Canadian phone numbers across all grids, not just the Canadian grid as initially identified. The issue prevented SMS verification codes from being delivered to Canadian phone numbers for 122.7 hours. Mimecast applied a fix and worked with their SMS provider to restore full delivery service.