The message body of an SMTP message that is sent to an external recipient is truncated in Exchange Server 2003 (891862)

SYMPTOMS

When you run Microsoft Exchange Server 2003 on a Microsoft Windows Server 2003-based computer, you may experience the following symptom. The message body of a Simple Mail Transfer Protocol (SMTP) message that is sent to an external recipient is truncated.

If you perform additional investigation, you may also notice one of the following symptoms or both the following symptoms:

The message may remain in the Exchange 2003 message delivery queue with a status of Retry, and Exchange 2003 repeatedly tries to resend the message.
If you perform a network monitor trace of the message traffic, you may notice that Exchange sends the following data in the middle of the DATA sequence of the message:
0D 0A 2E 0D 0A

CAUSE

This problem occurs if Exchange puts the "0D 0A 2E 0D 0A" data in the middle part of the DATA sequence when Exchange sends an SMTP message. The "0D 0A 2E 0D 0A" data corresponds to the "Carriage Return Line Feed.Carriage Return Line Feed" (CRLF.CRLF) combination. This combination indicates the end of the DATA command. The following sections describe how the placement of the "0D 0A 2E 0D 0A" data causes each symptom.

The message body is truncated

When Exchange 2003 sends the message that contains the "0D 0A 2E 0D 0A" data in the middle of the DATA part to a receiving SMTP server, Exchange 2003 tries to send the whole message to the receiving SMTP server. However, the receiving SMTP server does not accept data after the "0D 0A 2E 0D 0A" data. The receiving SMTP server then delivers the truncated message to the recipient.

The message remains in the delivery queue

When Exchange 2003 sends the message that contains the "0D 0A 2E 0D 0A" data in the middle of the DATA part to a receiving SMTP server, Exchange 2003 tries to send the whole message to the receiving SMTP server. However, when the receiving SMTP server receives the data that comes after the "0D 0A 2E 0D 0A" data, the receiving SMTP server returns a 500 error to Exchange 2003. The receiving SMTP server then resets the connection. Because the receiving SMTP server resets the connection, Exchange 2003 tries to resend the affected message.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

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

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

You must be running Windows Server 2003 to install this hotfix.

Restart requirement

You do not have to restart your computer 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 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 tool in Control Panel. Windows Server 2003, 32-bit versions

Date         Time   Version            Size    File name
--------------------------------------------------------------
29-Jan-2005  02:26  6.0.3790.260       44,544  Fcachdll.dll

Windows Server 2003, 64-Bit Enterprise Edition

Date         Time   Version        Size     File name      Platform
--------------------------------------------------------------------
29-Jan-2005  02:23  6.0.3790.260   140,288  Fcachdll.dll   IA-64