Microsoft KB Archive/175842

= The EXPN command is not supported by Exchange Internet Mail Service =

Article ID: 175842

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange 2000 Server Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition
 * Microsoft Exchange Server 2003 Standard Edition

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This article was previously published under Q175842



SUMMARY
The RFC 821 EXPN (expand) command is used to identify and return members of a named mailing list. This option is not supported by the Microsoft Exchange Internet Mail Service. If you attempt to use this command against an Exchange Internet Mail Service via a Telnet session or SMTP client session, you will receive the following error:

Exchange 4.0, 5.0, and 5.5: 502 command not implemented Exchange 2000, 2003: 500 5.3.3 Unrecognized command



STATUS
This behavior is by design.

Additional query words: imc connector XFOR

Keywords: kbinfo KB175842

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