Microsoft KB Archive/931524

= Hosted Messaging and Collaboration version 3.5 users receive a &quot;550 5.1.1 User unknown&quot; NDR message =

Article ID: 931524

Article Last Modified on 11/15/2007

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APPLIES TO


 * Microsoft Solution for Hosted Messaging and Collaboration 3.5

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SYMPTOMS
Microsoft Solution for Hosted Messaging and Collaboration version 3.5 users may receive the following non-delivery report (NDR) message when they send an e-mail message:

550 5.1.1 User unknown

This problem occurs if the SMTP virtual server to which the message is submitted is running the SMTP domains event sink (SMTPDomX.dll). This is the default configuration in Hosted Messaging and Collaboration version 3.5.



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

For information about how to install the SMTP sink that is included in this download package, view the SMTPDomX-readme.htm file that is included in the download package.

Prerequisites
There are no prerequisites for installing this hotfix.

Restart requirement
You must restart the SMTP service on each server after you install this hotfix.

Hotfix replacement information
This hotfix does not replace a previously released hotfix.

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 about the terminology that is used to describe Microsoft software updates, 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



When this problem occurs, the SMTP log records information that is resembles the following: 2006-12-18 11:47:59 120.220.30.11 mail.co.dk SMTPSVC1 EXFE01 180.80.80.80 0 EHLO - +mail.co.dk 250 0 317 16 0 SMTP - - - -

2006-12-18 11:47:59 120.220.30.11 mail.co.dk SMTPSVC1 EXFE01 180.80.80.80 0 MAIL - +FROM: 250 0 41 38 0 SMTP - - - -

2006-12-18 11:47:59 120.220.30.11 mail.co.dk SMTPSVC1 EXFE01 180.80.80.80 0 RCPT - +TO:+NOTIFY=FAILURE,DELAY 0 0 24 45 0 SMTP - - - -

2006-12-18 11:47:59 120.220.30.11 mail.co.dk SMTPSVC1 EXFE01 180.80.80.80 0 DATA - - 503 0 0 4 0 SMTP - - - - The presence of NOTIFY=FAILURE,DELAY indicates the problem.

Keywords: kbhotfixserver kbqfe kbfix kbbug kbpubtypekc KB931524

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