The EXPN command is not supported by Exchange Internet Mail Service (175842)
The information in this article applies to:
- Microsoft Exchange Server 4.0
- Microsoft Exchange Server 5.0
- Microsoft Exchange Server 5.5
- Microsoft Exchange 2000 Server
- 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.
| Modification Type: | Minor | Last Reviewed: | 4/28/2005 |
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| Keywords: | kbinfo KB175842 |
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