XFOR: Restricting Routing in the Internet Mail Service
ID: Q196626
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The information in this article applies to:
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Microsoft Exchange Server, version 5.5
SYMPTOMS
The Exchange Server Internet Mail Service allows you to configure the
server to allow mail relaying. This allows ALL mail to be routed if the
functionality has been enabled in the Internet Mail Service 'Routing'
property page. Exchange Server 5.5 Service Pack 1 allows the administrator
to impose restrictions on routing.
RESOLUTION
To enable these restrictions on routing functionality, perform the
following steps:
- Install Exchange Server 5.5 Server Pack 1 (or greater).
- Open the properties on the Exchange Server Internet Mail Service and
select the 'Routing' page. After SP1 installation, this page will have
an additional button called <Routing Restrictions...>.
- Click Routing Restrictions to bring up a dialog box with additional
Restrictions.
STATUS
MORE INFORMATION
Exchange Server 5.5 Service Pack 1 adds 'Routing Restrictions' to the
Internet Mail Service. This allows the administrator to specify who can
relay mail off of your Exchange Server computer.
The following Restrictions have been added:
Specify the hosts and clients that can route mail when the following
conditions have been met.
- Hosts and clients that successfully authenticate
Messages sent from hosts and clients with valid
logon information are relayed.
- Hosts and clients with these IP addresses
Messages sent from host whose IP addresses and
subnet mask fall within the range to be allowed
to relay.
To only allow a single host or client, enter in the
format, IP=>full IP address of client< (i.e 1.1.1.1),
MASK=255.255.255.255
To allow a range of IP address to relay, enter in the
format, IP=>scope to allow< (i.e 1.1.1.0>,
MASK=255.255.255.0. This will allow the address
range of 1.1.1.1 - 1.1.1.254 to relay.
- Hosts and clients connecting to these internal addresses
Messages sent by hosts and clients that connect to the specified IP
address on the Microsoft Exchange Server computer are relayed. This
allows multihomed servers to restrict message relay based on the IP
address to which the client connects. If you select this option, you
must disable IP forwarding on the Networking property pages in
Control Panel.
Specify the hosts and clients that can NEVER route mail.
- Messages sent from the specified IP addresses and
subnet mask are NOT relayed.
Additional query words:
rerouting spam spoof IMS SMTP
Keywords :
Version : WinNT:5.5
Platform : winnt
Issue type : kbprb