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You may experience a problem when Exchange 2000 receives a message over the Simple Mail Transfer Protocol (SMTP) and the message ends the data frame with:
CRLF.CRLF QUIT CRLF
Exchange server responds to the pipelined QUIT command with “500 5.3.3 Unrecognized Command.” Exchange server responds with a 250 in response to the CRLF.CRLF, and then responds with “500 5.3.3 Unrecognized Command” in response to the QUIT command. The same behavior occurs with other pipelined commands such as RSET.
Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
A supported hotfix is 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.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English version of this fix 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.
Date Time Version Size File name ------------------------------------------------------- 14-Jan-2003 21:56 5.0.2195.6621 322,320 Aqueue.dll 14-Jan-2003 21:56 5.0.2195.6620 66,832 Mailmsg.dll 14-Jan-2003 21:56 5.0.2195.6620 38,160 Ntfsdrv.dll 14-Jan-2003 21:56 5.0.2195.6654 442,640 Smtpsvc.dll
NOTE: Because of file dependencies, this update requires Microsoft Exchange 2000 Server Service Pack 3 (SP3). For additional information about how to obtain Exchange 2000 Server SP3, click the following article number to view the article in the Microsoft Knowledge Base:
301378 How to Obtain the Latest Exchange 2000 Server Service Pack
Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.