This is the message I got form the system not sure if it helps:
From MAILER-DAEMON Thu Sep 17 16:15:36 2009
X-Original-To:
shawn@www.mydomain.com
Date: Thu, 17 Sep 2009 16:15:36 -0700 (PDT)
From:
MAILER-DAEMON@www.mydomain.com (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To:
shawn@www.mydomain.com
Auto-Submitted: auto-replied
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="93C0F16842FD.1253229336/www.mydomain.com"
Content-Transfer-Encoding: 7bit
This is a MIME-encapsulated message.
--93C0F16842FD.1253229336/www.mydomain.com
Content-Description: Notification
Content-Type: text/plain; charset=us-ascii
This is the mail system at host
www.mydomain.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<devin@www.mydomain.com>: unknown user: "devin"
--93C0F16842FD.1253229336/www.mydomain.com
Content-Description: Delivery report
Content-Type: message/delivery-status
Reporting-MTA: dns;
www.mydomain.com
X-Postfix-Queue-ID: 93C0F16842FD
X-Postfix-Sender: rfc822;
shawn@www.mydomain.com
Arrival-Date: Thu, 17 Sep 2009 16:15:36 -0700 (PDT)
Final-Recipient: rfc822;
devin@www.mydomain.com
Original-Recipient: rfc822;devin@www.mydomain.com
Action: failed
Status: 5.1.1
Diagnostic-Code: X-Postfix; unknown user: "devin"
--93C0F16842FD.1253229336/www.mydomain.com
Content-Description: Undelivered Message
Content-Type: message/rfc822
Content-Transfer-Encoding: 7bit
Received: from localhost (localhost [127.0.0.1])
by
www.mydomain.com (Postfix) with ESMTP id 93C0F16842FD
for <devin@www.mydomain.com>; Thu, 17 Sep 2009 16:15:36 -0700 (PDT)
X-Virus-Scanned: Debian amavisd-new at
www.mydomain.com
Received: from
www.mydomain.com ([127.0.0.1])
by localhost (
www.mydomain.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id SKS9HYIY1bSR for <devin@www.mydomain.com>;
Thu, 17 Sep 2009 16:15:23 -0700 (PDT)
Received: by
www.mydomain.com (Postfix, from userid 1000)
id 343281684304; Thu, 17 Sep 2009 16:15:23 -0700 (PDT)
To:
devin@www.mydomain.com
Subject: Test
Message-Id: <20090917231523.343281684304@www.mydomain.com>
Date: Thu, 17 Sep 2009 16:15:23 -0700 (PDT)
From:
shawn@www.mydomain.com (Name)
Test 1234
--93C0F16842FD.1253229336/www.mydomain.com--