DOCUMENT:Q237927  30-SEP-1999  [exchange]
TITLE   :XIMS: Messages Sent to Encapsulated SMTP Address Are Rerouted
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5
OPER/SYS:
KEYWORDS:exc55 EXC55SP3Fix

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

When a message is sent to an encapsulated Simple Mail Transfer Protocol (SMTP)
one-off address through an Internet Mail Service that is configured so it does
not reroute SMTP messages, the message may still be rerouted. Encapsulated SMTP
one-off addresses contain the IMCEASMTP prefix.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server
version 5.5. For additional information, please see the following article in the
Microsoft Knowledge Base:

   Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or
later:

Component: Internet Mail Service

+---------------------------+
| File name    | Version    | 
+---------------------------+
| Msexcimc.exe | 5.5.2650.1 | 
+---------------------------+


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5. This problem was first corrected in Exchange Server 5.5 Service
Pack 3.

MORE INFORMATION
================

After you apply the fix, if rerouting is disabled, the Internet Mail Service
returns all messages that are sent to an encapsulated SMTP one-off address. If
rerouting is enabled, but one or more routing restrictions have been defined,
the messages are rerouted or returned based on these restrictions.


If you are using the Internet Mail Service as a site connector, rerouting must be
enabled after the fix is applied. The Internet Mail Service must be able to
reroute messages addressed to recipients that are homed on the bridgehead server
in the other site.

In addition, you should check the list of IP addresses that are allowed to relay
through your server and make sure that it's updated. This is because one side
effect of this problem is that it could allow incorrectly-configured sites to
operate correctly in some situations where the Internet Mail Service is used as
a site connector.

For example, suppose you intended to allow a server whose IP address is
192.168.0.1 to relay mail through your server using the Internet Mail Service as
a site connector. This problem would allow the server to relay mail through your
server even if you had not added 192.168.0.1 to the list of IP addresses that
are authorized to do so. If you then apply the fix, you would find that mail
relaying from 192.168.0.1 no longer works. However, you could restore proper
functionality by adding 192.168.0.1 to the list of approved servers. To do so,
view the properties for the Internet Mail Service, click the Routing tab, click
Routing Restrictions, and then add the server's IP address or subnet address.

To configure the Internet Mail Service so it does not reroute SMTP messages:

1. Start the Microsoft Exchange Server Administrator program. To do so, click
   Start, point to Programs, point to Microsoft Exchange, and then click
   Microsoft Exchange Administrator.

2. In the left pane, click the Connections object under the appropriate site. In
   the right pane, click the Internet Mail Service, and then on the File menu,
   click Properties. Note that the Connections object appears under the
   Configuration object.

3. Click the Routing tab, select "Do not reroute incoming SMTP mail", and then
   click OK.

When the Internet Mail Service is configured in this manner, messages addressed
to recipients that are listed in the global address list are delivered, but all
other messages are normally returned with a non-delivery report (NDR).

Additional query words: relay relayed

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Keywords          : exc55 EXC55SP3Fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : winnt:5.5
Issue type        : kbbug
Solution Type     : kbfix

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