Microsoft KB Archive/286673

= Event ID 4000 and Messages Are Not Delivered As Expected When You Use IIS 5.0 SMTP Service As Relay Host =

Article ID: 286673

Article Last Modified on 9/12/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Internet Information Services 5.0

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This article was previously published under Q286673



SYMPTOMS
When you use the Microsoft Internet Information Services (IIS) 5.0 Simple Mail Transfer Protocol (SMTP) service to relay messages to Microsoft Exchange Server 5.5 or other SMTP mailers, you may find that some messages take a long time to deliver and some messages are not delivered at all. Additionally, the following event is logged in the Event Viewer:

Type: Warning

Source: Smtpsvc

Event ID: 4000

Description:

Message delivery to the remote domain  failed. The connection was dropped by the remote host.



CAUSE
This behavior occurs because the Exchange Server 5.5 Internet Mail Service does not support the 8bitmime Extended Simple Mail Transfer Protocol (ESMTP) verb.



RESOLUTION
To resolve this behavior, use the MetaEdit 2.2 utility to turn off support for the 8bitmime ESMTP verb in IIS. To do so, follow these steps:  Download and install the MetaEdit 2.2 utility.

For additional information about how do to obtain and install the MetaEdit 2.2 utility, click the following article number to view the article in the Microsoft Knowledge Base:

232068 HOW TO: Download, Install, and Remove the IIS MetaEdit 2.2 Utility

 Click Start, point to Programs, point to Administrative Tools, and then click MetaEdit 2.2. Expand LM, expand SmtpSvc, and then expand 1. In the right pane, double-click SmtpInboundCommandSupportOptions. In the Edit Metabase Data dialog box, note that the default value that appears in the Data box is 7697601. To turn off support for the 8bitmime ESMTP verb, type 3503297 in the Data box, and then click OK.</li> To quit the MetaEdit 2.2 utility, on the File menu, click Exit.</li></ol>

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MORE INFORMATION
The hexadecimal value for 8bitmime is 0x400000H and the corresponding decimal value is 4194304. The hexadecimal values for all verbs that are controlled by the metabase are added together to form a single value that represents the various on or off switches for these verbs. This value in decimal format is stored in the SmtpInboundCommandSupportOptions entry which is equivalent to ID 3699800 in the metabase. The default value for SmtpInboundCommandSupportOptions is 7697601 (0x7574C1H). When you subtract the corresponding decimal value of an ESMTP verb from this number, you can turn on or off the various ESMTP verbs.

To turn off 8bitmime support, subtract the 8bitmime decimal value (41943040) from the default SmtpInboundCommandSupportOptions decimal value (7697601). When you do so, the resulting SmtpInboundCommandSupportOptions value is 3503297 (0x3574C1H).

For additional information about how to turn off ESMTP Verbs, click the following article number to view the article in the Microsoft Knowledge Base:

257569 XFOR: How to Turn Off ESMTP Verbs in Exchange 2000 Server

For additional information about the MetaEdit 2.2 utility, click the following article number to view the article in the Microsoft Knowledge Base:

232068 HOW TO: Download, Install, and Remove the IIS MetaEdit 2.2 Utility

For more information about the IIS metabase, visit the following Microsoft Web site:

http://technet2.microsoft.com/WindowsServer/en/Library/82ed0d68-045b-4016-9b51-85b18e77e1f81033.mspx

Keywords: kbprb KB286673

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