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When does postfix append a for <> in the Recieved: entry?

From: Eddy Ilg (eddyfericom.net)
Date: Thu Nov 01 2007 - 12:19:22 CDT

Hi,

we are using a spam filter that needs the information in the Recieved
header entry, such as:

Received: from mail2.rz.tu-harburg.de (mail2.rz.tu-harburg.de
[134.28.202.179])
        by smtp3.rz.tu-harburg.de (8.13.8/8.13.8) with ESMTP id l9TFak5e023365
        (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK)
        for <eddyfericom.net>; Mon, 29 Oct 2007 16:36:46 +0100

Sometimes postfix does not append the "for <user>". Can this be
controlled by configuration? When does it append the line and when does
it leave it out?

Best regards

Eddy Ilg