[EXIM] Remove _header

Hi,

i want to remove some part of the Received-Header

Received: from bla.bla.de ([10.10.10.10] helo=bla.de)
                by my.host.de with esmtp (Exim 2.05 #2) <------ i want
to remove this

my config:
Transport-Config:
     remote_smtp:
         headers_remove = "Received"  <----it remove the whole Received
Header

I tried this :
    remote_smtp:
         header_remove = "Received-by"

and
         header_remove = "by"

......any hints.....i dont want to remove the whole header :-)

Thanks
 "Life is like a box of choclate, u never know what u
  gonna get"     --Forrest Gump--
 ---------------------------------------------------------
 Lars Koschin                   | deltacity.NET GmbH & CO
 Systemadministration & Support | http://www.deltacity.net

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