You try to add an e-mail address that contains special characters to the list of blocked senders in Microsoft Forefront Threat Management Gateway (TMG) 2010. However, this operation fails and generates the following error message:
The Sender address is empty or not valid. Please enter a valid e-mail address.
For more information about special characters, refer to the "4.1.2. Command Syntax" section of Request for Comment (RFC) 821.
Service pack information
This problem is fixed in Forefront TMG 2010 Service Pack 1.
For more information about how to obtain Forefront TMG 2010 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
List of problems that are fixed in Forefront Threat Management Gateway 2010 Service Pack 1
Hotfix rollup information
To resolve this problem, install the hotfix rollup package that is described in the following Microsoft Knowledge Base article:
Description of the Forefront TMG 2010 hotfix package: February 12, 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Forefront TMG 2010 Service Pack 1.
For more information about RFC 821, visit the following RFC Web site:
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the standard terminology that is used to describe Microsoft software updates