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Hide internal address (Postfix)

Subject: Hide internal address (Postfix)
Date: 10 Jan 2006 10:11:16 -0000
Hi everyone!

Iam using Postfix for mail delivery.If somebody inside my network send mail 
outside the network, the recipient can see in the message header the internal 
address of the sender host.I would like to hide it, or replace it with the 
external address of my router.
Any suggestion?

best regards
chris

ps.:i appologize for my poorly grammar

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