XFOR: NDR: Unknown or Illegal User

ID: Q193924

The information in this article applies to:

Microsoft Exchange Server, versions 5.0, 5.5

SYMPTOMS

When sending a message to a Simple Mail Transfer Protocol (SMTP) address, you 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 is missing the at symbol (@) between the user name and the fully qualified domain name.

For example, the SMTP address, my.user.company.com, should read my.user@company.com.

Keywords :
Version : WINDOWS:5.0,5.5
Platform : WINDOWS
Issue type : kbprb