Some email messages are moved incorrectly to the "Badmail" folder instead of being delivered on a computer that is running Windows Server 2003 if the P2 header fields of the e-mail messages are very large

On a Windows Server 2003-based computer that has SMTP service installed, you configure the message delivery for domains. However, some messages are moved incorrectly to the "Badmail" folder instead of being delivered.

During message processing, the SMTP service checks the P2 headers on a computer that is running Windows Server 2003. If there are multiple lines for a P2 header, the wrong logic is used to check the line separator.

Hotfix Information for Windows Server 2003

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 Service Pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

This hotfix requires Microsoft Windows Server 2003 Service Pack 1 (SP1) or Microsoft Windows Server 2003 SP2 to be installed on the computer.

Restart Requirement

You must restart the Internet Information Services (IIS) Admin service and all dependent services after you apply this hotfix.

Hotfix Replacement Information

This hotfix does not replace any other hotfixes.

File Information

The English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.

Windows Server 2003 with Service Pack 1, X86 version

Windows Server 2003 with Service Pack 2, X86 version

Windows Server 2003, X64 version

Windows Server 2003 with SP2, X64 version

Windows Server 2003 with Service Pack 1, IA64 version

Windows Server 2003 with Service Pack 2, IA64 version

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

The P2 header contains the e-mail addresses for the e-mail message as defined in RFC 822. The P2 header contains the following fields:

• From
• Reply To
• Sender

For more information, visit the following Internet Engineering Task Force (IETF) Web site: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.