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This is my mail log file on my local RHEL5 system:-

From root@achal.com  Mon Jun  4 02:04:23 2012
Return-Path: root@achal.com
X-Original-To: c
Delivered-To: c@achal.com
Received: by www.achal.com (Postfix, from userid 0)
id 9C6C356014; Mon,  4 Jun 2012 02:04:23 -0700 (PDT)

To: c@achal.com
Subject: d
Message-Id: <20120604090423.9C6C356014@www.achal.com>
Date: Mon,  4 Jun 2012 02:04:23 -0700 (PDT)
From: root@achal.com (achal)

I want to change Return-Path: to achal@localdomain.in, I have tried header_ checks in postfix but i am not able to get the proper format.Can anybody tell me how to do this.

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up vote 0 down vote accepted

Check My own hostname, My own domain name & My own network addresses http://www.postfix.org/BASIC_CONFIGURATION_README.html

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