How often should Mimecast security settings be reviewed?

The frequency of reviewing Mimecast security settings is crucial for maintaining an effective security posture. The correct answer emphasizes that reviews should occur at least annually, or whenever there are changes in organizational risk profiles. This approach recognizes that security is not a static process; rather, it must adapt continuously to the evolving threat landscape and any changes that may affect an organization's risk.

Changes in the business environment, such as new regulations, shifts in operational practices, or vulnerabilities introduced by new technologies, can significantly impact security needs. Therefore, reviewing settings in response to such changes ensures that an organization is not only compliant but also protected against emerging threats.

In contrast, the other options suggest a fixed timeframe for reviews without considering the dynamic nature of organizational risks. Relying on a strict schedule without accounting for changes may lead to vulnerabilities going unaddressed, undermining the overall effectiveness of security measures in place.