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Consider the following scenario. You create a Sender of Policy Framework (SPF) record in Microsoft Windows Server 2003 Domain Name System (DNS). You enable Sender ID Filtering on a Simple Mail Transfer Protocol (SMTP) virtual server in Microsoft Exchange Server 2003 Service Pack 2 (SP2). In this scenario, the Sender ID filter may reject e-mail that is sent from an IP address that is associated with an SPF record that contains the following text:
v=spf1 mx -all
A supported hotfix is 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 software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
You must have Exchange Server 2003 SP2 installed to apply this hotfix.
You do not have to restart the computer after you apply this hotfix. However, Microsoft Internet Information Services (IIS) Admin Service and all dependent services are stopped and then restarted when you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfix.
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.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
After you apply this hotfix, you may notice a small increase in DNS query traffic.
MX records must not point to CNAME records.
For more information about how to configure Sender of Policy Framework records in the Windows Server 2003 Domain Name System, click the following article number to view the article in the Microsoft Knowledge Base:
912716 How to configure Sender of Policy Framework records in the Windows Server 2003 Domain Name System
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
817903 New naming schema for Exchange Server software update packages