sorry - I've been testing this from many different accounts. Here is the correct header from my zimbra hosted email
Code:
Return-Path: <xxx@kelmitgroup.com>
Authentication-Results: mta146.mail.ac4.yahoo.com from=kelmitgroup.com; domainkeys=neutral (no sig); from=kelmitgroup.com; dkim=neutral (no sig)
Received: from 74.63.66.50 (EHLO mail.snapshotit.com) (74.63.66.50) by mta146.mail.ac4.yahoo.com with SMTP; Thu, 29 Jan 2009 19:07:15 -0800
Received: from localhost (localhost [127.0.0.1]) by mail.snapshotit.com (Postfix) with ESMTP id 232744C08C for <xxx@yahoo.com>; Thu, 29 Jan 2009 21:07:13 -0600 (CST)
Received: from mail.snapshotit.com ([127.0.0.1]) by localhost (mail.snapshotit.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VxKc5qKckHwM for <xxx@yahoo.com>; Thu, 29 Jan 2009 21:07:12 -0600 (CST)
Received: from mail.snapshotit.com (mail.snapshotit.com [74.63.66.50]) by mail.snapshotit.com (Postfix) with ESMTP id 743CE4C054 for <xxx@yahoo.com>; Thu, 29 Jan 2009 21:07:12 -0600 (CST)
Date: Thu, 29 Jan 2009 21:07:12 -0600 (CST)
From:
"Drew A. Friestedt" <xxx@kelmitgroup.com>
Add sender to Contacts
To: xxx@yahoo.com
Message-ID: <1441639072.3071233284832367.JavaMail.root@mail.snapshotit.com>
Subject: call me
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Content-Length: 13