What is the name of the local folder in Mimecast that contains email addresses or domain names?

The correct response refers to the "Directory Group/AD Group" within Mimecast, which serves as a local folder for managing email addresses or domain names. This component acts as a crucial organizational tool that allows administrators and users to group users, email addresses, and domains for specific purposes such as policy application, reporting, and efficient management.

This local folder effectively integrates with Active Directory, enabling organizations to streamline their email management processes and enhance efficient communication by categorizing users into relevant groups. Such grouping helps ensure that policies and actions can be applied uniformly and allows for more organized management of user permissions and access within the Mimecast platform.

In contrast, other options do not serve the purpose of specifically containing email addresses or domain names in a structured manner like groups do. The "Address List" might appear relevant but is not the functional term used in Mimecast for this purpose. "Email Vault" refers to the archiving functionality for preserving emails, while "Recipient Archive" typically pertains to saved or archived messages rather than a folder for managing email addresses or domains. Thus, the naming and functionality of Directory Group/AD Group accurately aligns with the task described in the question.