True or False: Internal and external addresses are interchangeable in Mimecast.

In Mimecast, internal and external email addresses are not interchangeable, which is why the answer is false. Internal addresses refer to those users within an organization, typically ending with the company’s domain name, and are managed through the company’s domain settings and Mimecast's internal directory. On the other hand, external addresses encompass all other email addresses outside the organization's domain.

This distinction is crucial because internal and external communications often require different handling, policies, and security measures. For example, certain security policies may apply only to external communications to prevent phishing and spoofing attacks while allowing wider access and collaboration for internal communications. Consequently, the different infrastructures and compliance requirements for internal and external emails emphasize that they function within separate realms, thus establishing that they are not interchangeable.