LotusNotes, change from value

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C#

LotusNotes

Hello Everyone,
I am trying to send a mail with a hidden "from" value, but having troubles doing that.
So far I have managed to change the name in "From" field, but in the document properties it still shows my name as of sender. That name is under property "$UpdatedBy". I have tried setting that too prior to sending mail, but it still shows my name....
I assume this is added during the sending process.... any idea for a workaround?

Thanks a lot!