Microsoft KB Archive/193924

= XFOR: Non-Delivery Report: Unknown Or Illegal User =

Article ID: 193924

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q193924



SYMPTOMS
When sending a message to a Simple Mail Transfer Protocol (SMTP) address, users and administrators of Microsoft Exchange may receive a non-delivery report (NDR) similar to the following:   From:   System Administrator Sent:  Wednesday, March 11, 1998 8:22 AM   To:   Test User:Dekort, Ed   Subject:   Undeliverable: Test Message

Your message did not reach some or all of the intended recipients.

Subject:  Test Message Sent:  03/11/1998 8:21 AM

The following recipient(s) could not be reached:

Testing UpJohn:Dekort, Ed on 03/11/1998 8:22 AM     The recipient name is not recognized MSEXCH:IMC:SciCor:SciCorUS:HAWK 3553 553 5.1.1 unknown or illegal user: my.user.company.com



CAUSE
The SMTP address declared is not a fully qualified SMTP address.

In the example used, the SMTP address,, was probably intended to read.

Keywords: kbprb KB193924

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