Mimecast is currently experiencing a minor incident affecting United States Grid and United Kingdom Grid and 1 more component, which began 2h ago. The vendor's full update timeline is below.
Affected components
Update timeline
- 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.
- 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.
- 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.