Checking connectivity by using Microsoft Exchange Remote Connectivity Analyzer Tool

Fellow Developers,

                        I’m testing TCP Port 25 on host g.mx.mail.yahoo.com to ensure that it is listening.  I get the response ‘Active
Directory does not exist or can not be contacted.’   Any ideas as to why I get, or how can I get around this problem?, I have a brand new HP 17.3in Pavilion dv7t Quad series HDLaptop with Intel’s newest performance Q820M Extreme chip Windows 7 and
MS Office Professional