Microsoft KB Archive/312604

= XCON: Messages from Blocked Domain Bypass Global Filtering If Certain Special Characters Are in Address =

Article ID: 312604

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition

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This article was previously published under Q312604



SYMPTOMS
When you configure global message filtering to block messages that originate from a specific domain, some messages from that domain may bypass filtering. The messages that bypass filtering have certain special characters in the P2 From header address.

The following circumstances allow a message to bypass Exchange 2000 Server filtering:  Using quotation marks (&quot;) anywhere in the address itself (the quotation marks correctly appear around the sender's display name)

Example:

From: &quot;DisplayName&quot; 

 Using a square bracket or brackets ([ ]) anywhere in the address

Examples:

From: &quot;DisplayName&quot; 

From: &quot;DisplayName&quot; <[ab]@abc.com>

 Using a period (.) after the @ symbol

Example:

From: &quot;DisplayName&quot; 

 Omitting either or both of the necessary angle brackets (< >)

Example:

From: &quot;DisplayName&quot; ab@abc.com>

 Using more than one &quot;at&quot; symbol (@)

Example:

From: &quot;DisplayName&quot; 

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STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.

Microsoft is researching this problem and will post more information in this article when the information becomes available.

Keywords: kbbug kbnetwork kbpending kbui KB312604

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