Microsoft KB Archive/910272

= The &quot;Sender ID Filtering&quot; feature does not work correctly in an Exchange Server 2003 SP2 server =

Article ID: 910272

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
Consider the following scenario. An external server sends e-mail messages to a server that is running Microsoft Exchange Server 2003 Service Pack 2 (SP2). The Exchange Server 2003 SP2 server has the Sender ID Filtering feature enabled. In this scenario, the following symptoms may occur:
 * E-mail messages are rejected even though the sending server is included in the Sender Policy Framework (SPF) record.
 * E-mail messages are accepted even though the sending server is not included in the SPF record.



CAUSE
This problem occurs because of a problem in the way that the Exchange Sender ID engine applies subnet masks that are defined in the SPF records. The problem may occur if one or more non-class full subnets are defined in the SPF record of the sending domain. The following list contains two examples of non-class full subnets that may be defined in the SPF record of the sending domain:
 * v=spf1 ip4:10.0.0.128/25
 * v=spf1 ip4:10.0.63.0/18 -all

Note Generally, this problem does not occur when class full subnets are defined in the SPF record of the sending domain. The following list contains two examples of class full subnets:
 * 10.0.0.0/16
 * 10.0.0.0/24



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
Because of file dependencies, this software update requires Microsoft Exchange Server 2003 Service Pack 2 (SP2)

Restart requirement
Microsoft Internet Information Services (IIS) and IIS-dependent services are stopped when you install this software update

Hotfix replacement information
This hotfix does not replace any other software updates.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

817903 New naming schema for Exchange Server software update packages

Keywords: kbqfe kbfix kbbug kbexchange2003presp2fix kbpubtypekc KB910272

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