Article ID: 2579982 - View products that this article applies to.
When you send a signed email message in a Microsoft Exchange Server 2010 environment, you cannot view the message delivery report by using Microsoft Office Outlook or Microsoft Outlook Web App (OWA). Additionally, you receive the following error message on the Delivery Reports page:
Delivery Reports don’t support tracking messages of this type.
This issue occurs because the delivery report does not support the IPM.Note.SMIME.MultipartSigned message class.
To resolve this issue, install the following update rollup:
(https://support.microsoft.com/kb/2645995/ )Description of Update Rollup 1 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the MessageClass element, visit the following Microsoft website:
General information about the MessageClass element
Article ID: 2579982 - Last Review: February 13, 2012 - Revision: 1.0