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Undeliverable emails (with attachment)

Sending an email, including an attachment to a specific recipient generates the following undeliverable. the attachment is basically another email (text only).  however the same email is sent successfullywithout the attachment.   We are running Exchange 2007 on a 2003 server.

Delivery has failed to these recipients or distribution lists:

Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

The following organization rejected your message:


Sent by Microsoft Exchange Server 2007

Diagnostic information for administrators:

Generating server: #550 5.7.1 Your computer still thinks it's 2006. Fix your system clock and try again. ##

Original message headers:

Received: from ([]) by ([]) with mapi; Thu, 24 Jul 2008 08:27:21
From: John Buckley <>
To: "''" <>
Date: Thu, 24 Jul 2008 08:27:20 -0400
Subject: RE: Paper GC info request
Thread-Topic: Paper GC info request
Thread-Index: Acjs6wszH3QR0rznR0Cv606Ly+QwTgACAXXgAATIpHAAIHI7UA==
Message-ID: <>
References: <>
In-Reply-To: <>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
acceptlanguage: en-US
Content-Type: multipart/mixed;
MIME-Version: 1.0
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Can you send e-mail with attachments of any type?
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Yes, i was able to send a .doc and a .pdf file attachment.  could it be related to a block on nested emails?
Is your system time correct?

I have a user getting this error today with no attachments but the error code is 554-5.7.1. "Improper folded header field made up entirely of whitespace".
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