Mimecast is an international company specializing in cloud-based email management for Microsoft Exchange and Microsoft Office 365, including security, archiving, and continuity services to protect business mail.

The service uses a massively-parallel grid infrastructure for email storage and processing through geographically dispersed data centers, enabling it to offer a 100% uptime service level agreement on all services. Its Mail Transfer Agent provides intelligent email routing based on server or user mailbox location.