Which of the following best describes the purpose of Mailbox Auditing?

Mailbox Auditing is primarily designed to track and record access to mailboxes as well as the actions taken by users within those mailboxes. This functionality is crucial for several reasons, including enhancing security, accountability, and the ability to investigate unauthorized access or suspicious activities. By maintaining an audit trail of who accessed a mailbox and what operations were performed (such as reading emails, deleting messages, etc.), administrators can respond promptly to any breaches or compliance inquiries.

The focus on recording mailbox access and actions supports organizational security policies by allowing for checks and balances regarding access to sensitive information. This auditing process not only helps in identifying potential misuse but also provides insights that may be valuable for internal audits or investigations.

In contrast, the other options refer to different aspects of email management that are not directly related to the primary function of Mailbox Auditing. Improving email sending speed, ensuring compliance with regulations, and optimizing email storage capacity touch on different functionalities within an email system, but they do not align with the primary purpose of Mailbox Auditing, which centers on monitoring and recording access and user actions.