Which type of messages help in the functionality of populating Internal Directories?

Journaled messages contribute significantly to the functionality of populating internal directories because they are essentially records of email communications. When these messages are created, they capture detailed information about the sender, recipient, timestamps, and any relevant metadata. This information aids in the construction of the internal directory by providing a historical account of communications, which helps to maintain an updated and comprehensive view of the organization's email interactions.

Moreover, journaled messages are often utilized for compliance, auditing, and security purposes, ensuring that the internal directory reflects accurate and up-to-date information about users and their email activity. By archiving these messages, organizations can efficiently track changes in their internal communications and adapt their directories accordingly. The other options, while they may play roles in email communication or alerts, do not primarily serve the function of populating internal directories as effectively as journaled messages do.