Microsoft KB Archive/189999

= XADM: BCC Recipients Are Visible in an Embedded Message =

Article ID: 189999

Article Last Modified on 10/28/2006

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APPLIES TO

 Microsoft Exchange Server 5.0 Standard Edition Microsoft Exchange Server 5.5 Standard Edition Microsoft Exchange Client 5.0 Microsoft Exchange Client 5.0 for Macintosh Microsoft Outlook, Exchange Server Edition, when used with:  Microsoft Windows 3.1 Standard Edition

 Microsoft Windows 3.11 Standard Edition</li></ul> </li> Microsoft Outlook 8.0 Exchange Server Edition for Macintosh</li></ul>

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This article was previously published under Q189999

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SYMPTOMS
When a recipient of message that has been sent as a BCC to other recipients embeds this message in another message, the BCC recipients become visible in the embedded message. This only occurs with the Windows 3.x or Macintosh clients. 32-bit Windows clients do not display this behavior.

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CAUSE
Attachments (including embedded messages) do not have the delivered flag set during a CopyTo operation. Because BCC display is based on whether the message has been delivered, this causes the BCC recipients to be shown at all times. Outlook 32-bit Windows clients are using a fast transfer mechanism that strips off the BCCs during the copy (instead of a CopyTo as the Windows 3.x and Macintosh clients are using). This explains the discrepancy between the client behaviors.

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RESOLUTION
For Exchange Server version 5.5: To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

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STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0.

A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next service pack that contains this fix. Contact Microsoft Technical Support for more information.

This fix has been posted to the following Internet location:

ftp://ftp.microsoft.com/bussys/exchange/exchange-public/fixes/Eng/Exchg5.0/Post-SP2-STORE/

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5.

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MORE INFORMATION
During the message Config, the delivered flag is set according to the message flags. During a CopyTo, if the destination is an embedded message, the delivered flag is based off of the source item.

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB189999

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