Mimecast is a cybersecurity vendor focused on protecting enterprise communications, particularly email and collaboration tools, along with the human layer around those channels. Its products are designed to reduce risk from threats that target users and messaging workflows.

The suite spans email security, threat detection, archiving, continuity, and security-awareness workflows used in business environments. In practice, it fits into how organizations manage and secure inbound and outbound communications, preserve records, maintain availability during disruptions, and train employees as part of broader enterprise security operations.