The EXPN command is not supported by Exchange Internet Mail Service
Article ID: 175842
Article Last Modified on 10/25/2007
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
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