Warning Visual C++ will not
create a new ATL object if more than one .idl file is included in
your project. Delete all the .idl files except SMTPFLTR.idl from
the project, add the ATL object as described, and then replace the
.idl files that you removed.
Follow cleanup steps similar to those taken to create the COM
object that implemented IFWXSessionFilter. This includes the
copying and restoration of files, removal of specific files, and
removal of several lines of code. See the topic Create an IFWXSessionFilter COM
Object to review the cleanup procedures.