Question : Postfix Virtual Domains setup

Hi

I am configuring postfix server to send mail for 8 differnet domains.  I configured it using virtual_alias_domains and virtual_alias_maps parameters.  I am able to send mail as FROM any of these 8 domains.  

I am facing issue with the header of mail being sent from any of the virtual domain, please refer to the header of one of the mail as below:

Please refer to the 7th line in the header:
"Received: from CentOS52.localdomain ([])"

CentOS52.localdomain is the hostname of the system postfix is hosted on.

If I am sending from domain tmails.com then why is it showing hostname "CentOS52.localdomain " in the header, is there any way to replace hostname in the header with the domain name.

like if I am sending mail as [email protected] then it should show in header at 7th line:

"Received: from tmails.com ([])"

and if the second virtual domain configured in my postfix is "xmails" and if I am sending mail as [email protected] then it should show in header at 7th line:

"Received: from xmails.com ([])"


Header:
Delivered-To: [email protected]
Received: by 10.220.74.19 with SMTP id s19cs55809vcj;
        Wed, 10 Jun 2009 11:33:24 -0700 (PDT)
Received: by 10.142.232.7 with SMTP id e7mr637135wfh.164.1244658804206;
        Wed, 10 Jun 2009 11:33:24 -0700 (PDT)
Return-Path:
Received: from CentOS52.localdomain ([])
        by mx.google.com with SMTP id 3si1551335pzk.134.2009.06.10.11.33.22;
        Wed, 10 Jun 2009 11:33:23 -0700 (PDT)
Received-SPF: fail (google.com: domain of [email protected] does not designate as permitted sender) client-ip=;
Authentication-Results: mx.google.com; spf=hardfail (google.com: domain of [email protected] does not designate as permitted sender) [email protected]om
Received: from indiaws145 (unknown [192.168.2.72])
      by CentOS52.localdomain (Postfix) with SMTP id CD778781E5
      for ; Thu, 11 Jun 2009 00:03:19 +0530 (IST)
Message-ID: <6A5120BB1FEC46B9AA851EA2DC295A62@rapidcorp.com>
Reply-To: "Ashwani Jain"
From: "Ashwani Jain"
To:
Subject: Test-5
Date: Thu, 11 Jun 2009 00:03:14 +0530
MIME-Version: 1.0
Content-Type: multipart/alternative;
      boundary="----=_NextPart_000_005D_01C9EA28.03CC93A0"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.5512
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579

This is a multi-part message in MIME format.

------=_NextPart_000_005D_01C9EA28.03CC93A0
Content-Type: text/plain;
      charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

hi!
------=_NextPart_000_005D_01C9EA28.03CC93A0
Content-Type: text/html;
      charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable



charset=3Diso-8859-1">

hi!

</BODY>ML>

------=_NextPart_000_005D_01C9EA28.03CC93A0--

Answer : Postfix Virtual Domains setup

Just set different smtp_helo_name in configuration files for each instance.