Registrations are now open. Join us today!
There is still a lot of work to do on the wiki yet! More information about editing can be found here.
Already have an account?

Microsoft KB Archive/931524

From BetaArchive Wiki
< Microsoft KB Archive
Revision as of 10:26, 21 July 2020 by X010 (talk | contribs) (Text replacement - ">" to ">")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Article ID: 931524

Article Last Modified on 11/15/2007


  • Microsoft Solution for Hosted Messaging and Collaboration 3.5


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:

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:

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.


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.

File name File version File size Date Time Platform
Domains.dat Not applicable 11,000 15-Jan-2007 17:50 Not applicable
Sinkreg.vbs Not applicable 587 15-Jan-2007 17:50 Not applicable
Smtpdomx.dll 144,752 15-Jan-2007 17:59 x86
Smtpdomx.reg Not applicable 330 15-Jan-2007 17:50 Not applicable
Hesmtpeventsinkdatgenerator.dts Not applicable 65,024 15-Jan-2007 17:50 Not applicable


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


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 SMTPSVC1 EXFE01 0 EHLO - 250 0 317 16 0 SMTP - - - -

2006-12-18 11:47:59 SMTPSVC1 EXFE01 0 MAIL - +FROM:<> 250 0 41 38 0 SMTP - - - -

2006-12-18 11:47:59 SMTPSVC1 EXFE01  0 RCPT - +TO:<>+NOTIFY=FAILURE,DELAY 0 0 24 45 0 SMTP - - - -

2006-12-18 11:47:59 SMTPSVC1 EXFE01 0 DATA - - 503 0 0 4 0 SMTP - - - -

The presence of NOTIFY=FAILURE,DELAY indicates the problem.

Keywords: kbhotfixserver kbqfe kbfix kbbug kbpubtypekc KB931524