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According to the Cisco Secure Email Threat Defense User Guide, the No Authentication option is only available if you are using a Cisco Secure Email Gateway (SEG) as your message source. This option allows visibility only, no remediation1.

The other options are not valid because:

• A. Basic Authentication is not a visibility and remediation mode for Cisco Secure Email Threat Defense. It is a method of authenticating users with a username and password2.
• C. Microsoft 365 Authentication is a visibility and remediation mode that allows you to use Microsoft 365 credentials to access Cisco Secure Email Threat Defense. It has two sub-options: Read/Write and Read. This mode is available for both Microsoft 365 and Gateway message sources1.
• D. Cisco Security Cloud Sign On is not a visibility and remediation mode for Cisco Secure Email Threat Defense. It is a service that manages user authentication for Cisco security products, including Cisco Secure Email Threat Defense3.

The safelist/blocklist (SLBL) is a feature that allows Cisco ESA to accept or reject messages from specific email addresses or domains, based on the configuration of mail flow policies or end user preferences.

The action that provides direct access to view the SLBL on Cisco ESA is to export the SLBL to a .csv file, which can be done from the web user interface by selecting Security Services > Safelist/Blocklist and clicking Export.

The other options do not provide direct access to view the SLBL on Cisco ESA.

References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 6-13 and page 6-14.

Enabling End-User Quarantine Access and pointing to an LDAP server for authentication is the action that must be taken to meet this requirement. End-User Quarantine Access is a feature that allows users to access their personal quarantine on Cisco ESA using their email address and password, without requiring an administrator account or access to Secure Email and Web Manager.

To enable End-User Quarantine Access on Cisco ESA, the administrator can follow these steps:

• Select Security Services > IronPort Anti-Spam > End User Safelist/Blocklist Settings and click Edit Settings.
• Under End User Quarantine Access, select Enable End User Quarantine Access.
• Under Authentication Server, select LDAP Server from the drop-down menu and choose an LDAP server profile from the drop-down menu.
• Click Submit.