EX13-CA-000100 - Exchange POP3 service must be disabled.
The POP3 protocol is not approved for use within the DoD. It uses a clear text based user name and password and does not support the DoD standard for PKI for email access. User name and password could easily be captured from the network allowing malicious users to access other system features. Uninstalling or disabling the service will prevent the use of the POP3 protocol.
Open the Windows PowerShell and enter the following command: services.msc Navigate to and double-click on Microsoft Exchange POP3 Backend. Click on the General tab. In the Startup Type: dropdown, select Disabled. Click the OK button.