XCON: Message to SMTP Address Fails with Reason 0 (176128)

SYMPTOMS

When you attempt to send a message to a one-off SMTP address from a Microsoft Mail client and the SMTP address does not exist in the Exchange Server Global Address List or in the user's Personal Address Book, the following non-delivery report (NDR) may occur:

   Your Message
   To:  <SMTP recipient name>
   Subject: <Text of message subject line>

   Was not delivered for the following reasons:

   Delivery failed due to unknown address
   Reason: 0 (transfer failed)
   Diagnostic: -1 (no diagnostic)
   MSEXCH:IMS:<Organization Name>:<Site Name>:<Server Name> No proxy for
   Recipient

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0. This problem has been corrected in the latest U.S. Service Pack for Microsoft Exchange Server version 5.0. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

MORE INFORMATION

If the one-off address is found as a proxy address in the Exchange Server Global Address List or the user's local PAB, the message will be delivered without failure.