XFOR: EXPN Command Not Supported By Exchange Internet Mail Service

ID: Q175842

The information in this article applies to:

Microsoft Exchange Server, versions 4.0, 5.0, 5.5

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:

502 command not implemented

This is by product design.

Additional query words: imc connector

Keywords : XFOR
Version : WINDOWS:4.0,5.0,5.5
Platform : WINDOWS
Issue type : kbinfo