Notes/Domino 6 and 7 Forum : Sending MIME messages using LotusScript

I'd like to know how I can stop Notes from inserting the "From" header in the message. I am setting it using the following code (both don't work, and you can only use one at a time or else you get errors) but I receive the email message with the From header looking like

From: MYNotes_Name/ORG%ORG@mydomain.com
(where MyNotes_Name is my Notes common user name and ORG is my organization in the Domino directory)

CODE:
Dim mailDoc As NotesDocument
Dim body As NotesMIMEEntity
Dim header As NotesMIMEHeader

Set mailDoc = New NotesDocument(db)
Set body = mailDoc.CreateMIMEEntity

' use the doc to set From

Call mailDoc.ReplaceItemValue("From", "NOREPLY@mydomain.com")

'or
' use the MIME header to set From

Set header = body.CreateHeader("From")
Call header.SetHeaderVal("NOREPLY@mydomain.com")

Is there a setting I need to enable to tell Domino to keep it's hands out of the message? Or is it because I'm using the NotesDocument.send() method? Is there a way around this so I can set the From header?

Thanks,
Shawn