Notes/Domino 4 and 5 Forum

Hi, I have a old problem again. In other case, somebody helped me with Principal property, I need change user remitance (From), and tip worked good. But I changed my server, old server was Fortin_SRV01/MEX/Bellota, my new server is Fortin_SRV01/MEX/Bellota, in a new equipment. So now, From es equal that user that is working the document, and isn´t user that I put in my code. This my Code:

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Dim vserverfuente As String
Dim fileNum As Integer
fileNum% = Freefile()
Open "c:\infoNC.txt" For Input As fileNum% 'Where infoNC.txt contains Fortin_SRV02/MEX/Bellota
Line Input #1, vserverfuente$
Close fileNum%

Dim db As New NotesDatabase ( vserverfuente, "NC.nsf" )
Set newDoc = New NotesDocument( db )
'... This rest code
newDoc.Principal = vNCmail 'Where VNCmail contains ncmexico@mex.bellota.com

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Result is a mail send to user target, but with jorge.sanchez@mex.bellota.com as From.

Can somebody help me please?, Thanks, best regards.