What does this message means "554 Invalid data in message"?

I have a customer who receives a message from the Internet Mail Administrator. It has the following delivery faliure message:

Your message has encountered delivery problems
to the following recipient(s):

bernasconip@coned.com
Delivery failed
554 Invalid data in message

Sent:    (message data)
Received:554 Invalid data in message
The mail client is Outlook 2000. I check and verify the email address and was able to send a test email to the email address with no problem. Only when the customer sends a email with a MSWord attachment is when they received the delivery failure. Is it something within the email or the attachment?

waveryiiiAsked:
Who is Participating?
 
jlevieCommented:
That looks like it is your mail server that is objecting to the message content. What version of Sendmail are you running and has your email system been extended with any sort of anti-spam/anti-virus filters?
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jlevieCommented:
Does this happen with any attachment this user sends? If thats is the case I'd supect that his Outlook or OS is hosed and isn't correctly building a MIME/multi-part message.
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waveryiiiAuthor Commented:
It only happens when the customer is using the email address in question, indicated in the error log, and just one particular email with a word attachment.
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jlevieCommented:
If it only happens with that particular address and then only when the message includes a word doc attachment I'd be inclined to think that the problem is at the receiving MTA. Seeing the actual error bounce (including all headers) would help in diagnosing the problem.
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waveryiiiAuthor Commented:
Here is the actual error log:

Reporting-MTA: dns; mail2.paconsulting.com
Received-From-MTA: dns; loncon01.paconsulting.com (unverified [193.123.60.43])
Arrival-Date: Wed, 12 Nov 2003 16:27:09 +0000

Final-Recipient: rfc822; bernasconip@coned.com
Action: failed
Status: 2.0.0 (Success - no additional status information available)
Remote-MTA: dns; m020-fw2.coned.com
Diagnostic-Code: smtp; 554 Invalid data in message
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