Microsoft small business knowledge base

Article ID: 316204 - Last Review: October 24, 2013 - Revision: 4.1

This article was previously published under Q316204
This article has been archived. It is offered "as is" and will no longer be updated.


When the Forward all messages with unresolved recipients to host option is set on a virtual server, if you send a message to an unknown EX or X500 address similar to the following
an event ID 4000 is written to the Application event log with the following error:
Handle file is invalid
Other unresolved messages may also back up in the queue.

An example of this scenario may be when a user replies to an old mail message from another user who has been recreated or migrated, and who no longer has the same legacyExchangeDN or X.500 proxy address.


The RCPT TO command is not issued to the remote host because the recipient has not been encapsulated in SMTP format.


To resolve this problem, obtain the latest service pack for Microsoft Exchange 2000 Server. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
301378  ( ) XGEN: How to Obtain the Latest Exchange 2000 Server Service Pack
The English version of this fix should have the following file attributes or later:

Collapse this tableExpand this table
File nameVersion

NOTE: Due to file dependencies, this update requires Microsoft Exchange 2000 Server Service Pack 2.


Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server. This problem was first corrected in Microsoft Exchange 2000 Server Service Pack 3.

  • Microsoft Exchange Server 2000 Service Pack 1
  • Microsoft Exchange 2000 Server Service Pack 2
kbnosurvey kbarchive kbbug kbexchange2000presp3fix kbexchange2000sp3fix kbfix KB316204
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