How can I hide internal server names from outbound mail headers?

I need to be able to hide my internal server names from the headers on external bound mail.  

I have an Exchange 2007 CCR cluster on 2 servers and another server with hub transport/client access roles.

I've tried specifying the FQDN in the send connector but it doesn't change anything.

Any help would be appreciated. Thanks.
odddballAsked:
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kieran_bCommented:
In Exchange 2003 I know it was the case that you cannot change this, I doubt it has changed in 2007, and am looking for an article that agrees.
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