CDONTs is no longer supported on Windows 2003 server.  Microsoft introduced CDO back several years ago to replace CDONTs.

You will need to convert your code to use CDO. 

For more information on CDO, please visit

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_about_cdo_for_windows_2000.asp