Sending mail using MAPI

I try to build the MAPI sending function in VB,but it doesn't work.

The program:
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Dim strShell as String
strShell=App.Path & "\MAPISEND.EXE -u Outlook -p dummy -r ""[email protected]"" -s ""Mail Subject"" "

Shell strShell,vbHide
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The strange thing is when I use telnet to login in the remote server, the program runs well, but when I operate in the server directly, it doesn't work.

So, I'm doubt where the problem is, the permission, the outlook confirguration....

Thanks a lot for your help.