We've recently been having problems with "Unknown user" emails being
returned even though I know that the email address is valid. Here is the
header that is returned:

=============================================

Unknown user: [EMAIL PROTECTED]


Original message follows.

Received: from MY_PC [66.37.132.32] by xo.com
  (SMTPD32-6.04) id A59114A074A; Thu, 14 Jun 2001 11:17:37 -0400
From: "Mike Smith" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Subject: Hello!!
Date: Thu, 14 Jun 2001 11:34:36 -0700
Message-ID: <[EMAIL PROTECTED]>
MIME-Version: 1.0
Content-Type: text/plain;
        charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0)
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400

============================================

If I try to send the same message from an outside email client i.e. YAHOO,
the message goes thru just fine. Any ideas where I can start to look for a
solution for this problem? Any help would be greatly appreciated.

Greg
303-598-1865
[EMAIL PROTECTED]


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