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The EXPN command is not supported by Exchange Internet Mail Service

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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:
500 5.3.3 Unrecognized command

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Status

This behavior is by design.

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Properties

Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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Keywords: KB175842, kbinfo

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Article Info
Article ID : 175842
Revision : 11
Created on : 4/26/2011
Published on : 4/26/2011
Exists online : False
Views : 514