These are the message headers from what I sent. (I've removed my actual domain names for security reasons.)
Return-Path: <me@mydomain.com>
Received: from localhost (mail.mydomain.com [127.0.0.1])
by mail.mydomain.com (Postfix) with ESMTP id EBFD37AD8
for <user@domain.com>; Fri, 23 Aug 2013 08:34:33 -0400 (EDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=
mydomain.com; h=content-language:x-mailer:content-type
:content-type:mime-version:message-id:date:date:subject:subject
:to:from:from; s=dkim; t=1377261273; x=1378125273; bh=NH4iohQTfP
+CEMGgAgOq6cl4xxZ+gFh6a5FyfdS6PT8=; b=MZxxBa11Ajgf6Tl1hTMxOVxEUP
IHQStG4j16v4MbvuIVy9JNp1RZDNZ0Pu1dCejRBUN/1UwdN4kLUmUJbNClRo4enu
8S3DpnWQzjGLReqmO3GpDCtSMzU/FXZ3oq/Dn51bLMeM4hrHOPFsZAFhVjG0DOQy
1b/GNFfFAK8yP4tE0=
X-Virus-Scanned: amavisd-new at mail.mydomain.com
Received: from mail.mydomain.com ([127.0.0.1])
by localhost (mail.mydomain.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id 2LzkRzaNkTWn for <tdalloo@allwaystel.com>;
Fri, 23 Aug 2013 08:34:33 -0400 (EDT)
Received: from MACHINE (unknown [192.168.1.114])
by mail.mydomain.com (Postfix) with ESMTPA id 24D3D373D
for <user@domain.com>; Fri, 23 Aug 2013 08:34:33 -0400 (EDT)
From: "Me" <me@mydomain.com>
To: <user@domain.com>
Subject: Test
Date: Fri, 23 Aug 2013 08:34:33 -0400
Message-ID: <001301ce9ffd$1ed10480$5c730d80$@mydomain.com>
MIME-Version: 1.0
Content-Type: multipart/related;
boundary="----=_NextPart_000_0014_01CE9FDB.97C11230"
X-Mailer: Microsoft Outlook 14.0
Thread-Index: Ac6f/RVnwu34iM9qQ6y4pF8j7QCI8w==
Content-Language: en-us