Hi,

I've now set up my a second mailserver at our office.
Both Mailservers run within a VM and both on Debian Squeeze.

I tought I've configured them both the same but actually the
new Mailserver behaves a little bit different.

When I send a mail from the old mailserver, everything looks
like it should and the following line is found within the mailheader:

Received: from mail.mailserver2.de (mail.mailserver2.de [10.11.12.13])
    by mail.mailserver1.de (Postfix) with ESMTP id BBD4CA850D
    for <info@domain2.com>; Mon,  29 Aug 2011 12:14:25 +0200 (CEST)

But when I send a mail from the new mailserver, this line is added
to the mailheader:

Received: from mail.mailserver1.de (static.44.33.22.11.clients.your-server.de [11.22.33.44])
    by mail.mailserver2.de (Postfix) with ESMTP id 7E907175830
    for <info@domain1.com>; Mon,  29 Aug 2011 12:13:06 +0200 (CEST)

where 11.22.33.44 is the IP of the Server on which the Mailserver-VM
is running.
Could you please tell me what I need to change to get

Received: from mail.mailserver1.de (mail.mailserver1.de [11.12.13.14])

instead of

Received: from mail.mailserver1.de (static.44.33.22.11.clients.your-server.de [11.22.33.44])

If you need config-file to dive into this, I will provide them of cause.
I just do not know where to start...