Error message in Outlook when you click the signature icon of a signed e-mail message that an Exchange Server 2007-based Edge server receives: "The digital signature is invalid"

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Article ID: 949703 - View products that this article applies to.
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SYMPTOMS

When a Microsoft Exchange Server 2007-based Edge server receives signed e-mail messages that have an attachment from the Internet, the Microsoft Outlook MAPI users receive the messages. However, the digital signature is invalid. If you click the signature icon in Microsoft Outlook, you receive the following error message:
The digital signature is invalid

CAUSE

This problem occurs because the Attachment Filter agent adds the Content-Description field together with the file name of the attachment to the message. For the messages that are signed, this modification invalidates the digital signature.

RESOLUTION

Update information

To resolve this problem, install Update Rollup 2 for Exchange Server 2007 Service Pack 1 (SP1) on the Exchange server. For more information about Update Rollup 2 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
Description of Update Rollup 2 for Exchange Server 2007 Service Pack 1
For more information about how to install the latest Exchange service pack or update rollup, see the following Exchange Help topic:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007
After you install Update Rollup 2 for Exchange Server 2007 SP1, add the following line in the Edgetransport.exe.config file in the <AppSettings> section:
<add key="SkipDigitalSignedMessageFromAttachmentFilterAgent" value="true" />

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about the Attachment Filter agent, visit the following Microsoft Web site:
http://technet.microsoft.com/en-us/library/aa998012(EXCHG.80).aspx
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
824684 Description of the standard terminology that is used to describe Microsoft software updates

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Article ID: 949703 - Last Review: January 19, 2009 - Revision: 3.2
APPLIES TO
  • Microsoft Exchange Server 2007 Enterprise Edition
  • Microsoft Exchange Server 2007 Standard Edition
Keywords: 
kbbug kbfix kbqfe kbhotfixrollup KB949703

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