In a Microsoft Exchange Server 2007 environment, you send an e-mail message to an external user. However, the e-mail address is not correctly encoded according to RFC 2047. This problem occurs if the following conditions are true:

•	The display name of the recipient or of the sender is in the Lastname, Firstname format.
•	The display name of the recipient or of the sender contains an umlaut.

For example, a display name such as "Jürgen, Müller" is displayed as follows in the header of the received message: A comma is missing. The display name in the header should be displayed as follows:Note This problem may cause some third-party applications such as an SMTP relay server or a POP3 client not to work successfully when the application parses the e-mail address.

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To resolve this problem in Exchange Server 2007 Service Pack 1, install Update Rollup 1 for Exchange Server 2007 Service Pack 1. For more information, click the following article number to view the article in the Microsoft Knowledge Base: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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

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For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: For more information about the naming schema for Exchange Server software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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For more information about RFC 2047, visit the following Internet Engineering Task Force (IETF) Web site:The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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