When I have configured the Certification Authority and issued the CA certificate, and then enabled the mail services for it.
But when I used the Outlook 2007 to connect the ebox machine, I got the warning messages like that "The server you are connected to is using a security certificate that cannot to verified". After that, I chose "View Certificate..", in the "General" tab, I got below:
Windows does not have enough information to verify this certificate.
Issue to: ebox
Issued by: Certification Authority Certificate
Valid from 6/6/2010 to 3/1/2013