My client using Thundebird for Ubuntu, roundcube default from iRedOS 0.6 64bit, domain is same with the sender.

Below is the message header:

From - Mon Feb 14 16:21:42 2011
X-Account-Key: account1
X-UIDL: 0000e86a4bf0fae3
X-Mozilla-Status: 0001
X-Mozilla-Status2: 10000000
X-Mozilla-Keys:                                                                                 
Return-Path: <aaa@mydomain.org>
Delivered-To: bbb@mydomain.org
Received: from localhost (localhost.localdomain [127.0.0.1])
    by localhost.localdomain (iRedMail) with ESMTP id 405EBF8814D
    for <bbb@mydomain.org>; Mon, 14 Feb 2011 16:05:42 +0700 (WIT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.org; h=
    message-id:in-reply-to:x-mailer:content-type:mime-version:date
    :subject:to:from:x-virus-scanned:x-virus-scanned; s=dkim; t=
    1297674341; x=1298538341; bh=gu0+OfjYTD520GUghARhLgB3l8/vHzUcTDH
    RMljBKz0=; b=qSRt9ba9zlgejBClbgmCo0T8THrHG81YdseuqPl9W/tQlAa4XrH
    uXgvASd3MMVtCMA1uzHzVldneGx+tWNhMo6yPRfXFqMO6lQlqCLB1+dYczFvrGp0
    CBPppHvCPykOzsTeOsT3m4HZHvxU2SPjCysB4nYY8kTzQ2ePlaxij5AY=
X-Amavis-Modified: Mail body modified (using disclaimer) - mail2.mydomain.org
X-Virus-Scanned: amavisd-new at mydomain.org
Authentication-Results: mail2.mydomain.org (amavisd-new); dkim=softfail
    (invalid, public key: not available) header.i=@mydomain.org
Received: from localhost.localdomain ([127.0.0.1])
    by localhost (mail2.mydomain.org [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id r3+d4SXjdLoQ for <bbb@mydomain.org>;
    Mon, 14 Feb 2011 16:05:41 +0700 (WIT)
Received: from mail2.mydomain.org (localhost.localdomain [127.0.0.1])
    by localhost.localdomain (iRedMail) with ESMTP id A7471F88152
    for <bbb@mydomain.org>; Mon, 14 Feb 2011 16:05:37 +0700 (WIT)
Received: from 123.456.123.789
    by mail2.mydomain.org with POP3 (fetchmail-6.3.6)
    for <bbb@mydomain.org> (single-drop); Mon, 14 Feb 2011 16:05:37 +0700 (WIT)
Received: from localhost (colo.mydomain.org [127.0.0.1])
    by colo.mydomain.org (iRedMail) with ESMTP id 7BCEE211826C;
    Mon, 14 Feb 2011 16:26:14 +0700 (WIT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.org; h=
    message-id:in-reply-to:x-mailer:content-type:content-type
    :mime-version:date:date:subject:subject:to:from:from; s=dkim; t=
    1297675572; x=1298539572; bh=d8b23zrkejTT0/2kzDolpytAuMvpc72uxZA
    9bVGs4uI=; b=PdHTaLhI9yvst1TL0hHc3MqWFZ4ENw6dQNdg/zAjHKlMayslrwG
    tJXrjOHjd/mEbcrvoFVN+RqK8wWeUIfjjXbRXGZRJ/kprW1a6Dq6PO128y/6sM+T
    u/7jEZtP61dFYw0GDzmJuFBH/PAAOnDJTLfNqomgsfsSZ91wCPYwqh40=
X-Virus-Scanned: amavisd-new at mydomain.org
Received: from colo.mydomain.org ([127.0.0.1])
    by localhost (colo.mydomain.org [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id IjhMs-AOA+H7; Mon, 14 Feb 2011 16:26:12 +0700 (WIT)
Received: from openfire.mydomain.org (unknown [111.111.111.111])
    by colo.mydomain.org (iRedMail) with ESMTP id 12C672118239;
    Mon, 14 Feb 2011 16:26:06 +0700 (WIT)
Received: from ESBYPCH02 (unknown [192.168.31.184])
    by openfire.mydomain.org (Postfix) with ESMTP id 28FEF12857D;
    Mon, 14 Feb 2011 16:20:39 +0700 (WIT)
From: "aaa" <aaa@mydomain.org>
To: "bbb" <bbb@mydomain.org>,
Subject: Monitoring Chart dd Feb 14, 2011
Date: Mon, 14 Feb 2011 16:23:05 +0700
MIME-Version: 1.0
Content-Type: multipart/mixed;
    boundary="----=_NextPart_000_03C0_01CBCC63.75B3B010"
X-Mailer: Microsoft Office Outlook, Build 11.0.5510
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
In-Reply-To: <5ACACB497A384FD18158149A113F1DDE@AlbertPC>
X-MS-TNEF-Correlator: 0000000050A7BD0CC06E214D9E16C1581ADEB29944A84C00
Thread-Index: Acu+zSZHWmvIOPppS02wkRV9zYUj0QADEjJQAI/R6iAABTPWQAAyN6BAACsIkhAA/Iz5IAADtKWQAC3voDAABrtcMAABFCLAAC2NKgAAA9EugAAs2zTAAAA3ISAAM0Z0UAAAjwuwAAPlsjAAhd+PsAAPfNOg
Message-Id: <20110214092039.28FEF12857D@openfire.mydomain.org>

This is a multi-part message in MIME format.

------=_NextPart_000_03C0_01CBCC63.75B3B010
Content-Type: text/plain;
    charset="big5"
Content-Transfer-Encoding: quoted-printable