Lesson 1 in Visual C#

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Lesson 1
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Exchange Servers
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Configuring ISA Server to Secure SMTP Traffic
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9-17
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IIS Server running SMTP Message Screener
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ISA Server
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Deploying the SMTP Message Screener on a protected IIS Server computer
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Important Exchange Server 2003 enables the option to block an SMTP connection based on the IP address of the connecting SMTP server. If you configure the SMTP Message Screener, you will not be able to use this feature on Exchange Server 2003, because all messages will come from the computer that is running Message Screener.
The second design question is whether to scan inbound messages only or both inbound and outbound messages. Here again, you have two options:
Use Message Screener for inbound messages only In this configuration, you configure ISA Server to publish the server running Message Screener, and configure Message Screener to forward all allowed messages to the computers running Exchange Server on the internal network. You also configure the access rule on ISA Server to allow the internal computers running Exchange Server to send SMTP messages to the Internet. Use this configuration if your organization has no requirement to scan outbound message contents. Use Message Screener for inbound and outbound messages In this configuration, you configure ISA Server to publish the server running Message Screener, and configure Message Screener to forward all approved messages to the computers running Exchange Server on the internal network. You also configure the internal computers running Exchange Server to send all SMTP messages to the server running Message Screener. Message Screener scans outbound messages and then forwards the messages through ISA Server to the Internet. In this scenario, the server running Message Screener must be able to use DNS to locate the mail servers for both the internal and external DNS domains. Use this configuration to ensure the security of outbound e-mail. For example, you can use Message Screener to scan outbound messages for specific content or to block messages with specified attachments.
9-18
9
Integrating ISA Server 2004 and Exchange Server
Real World
Keeping Unwanted E-Mail Out of Your Organization
If you are using Internet e-mail, it is virtually inevitable that you will be exposed to unwanted e-mail. If you are responsible for managing a messaging infrastructure for your organization, one of your biggest headaches will be keeping such unwanted e-mail out of your organization. Although you can use ISA Server to provide some protection against spam and viruses, the ISA Server Message Screener just doesn t provide enough functionality for most organizations. There are much better options available for keeping unwanted e-mail out of your organization. One option is to make use of the spam-filtering features included with Exchange Server 2003. One of the options available in Exchange Server 2003 is the use of a real-time block list (RBL). To configure RBL support, configure the Exchange Server computer to send a query to an RBL provider. The RBL provider maintains a list of all the IP addresses for known sources of spam. When you enable RBL filtering, the Exchange Server computer will send a query to the RBL provider to check if the IP address of the SMTP server that is attempting to make a connection is on the RBL. If the address is on the list, the connection is dropped. Exchange Server 2003 also supports Intelligent Message Filter, which allows you to configure what levels of spam will be blocked at the Exchange Server computers and what messages will be sent to the Junk E-Mail folder in Outlook 2003. There are also excellent third-party products available for message screening using SMTP gateway servers. These products provide RBL support, advanced message scanning functionality and advanced management options so that administrators and users can configure white lists (e-mail senders whose messages should never be blocked) and black lists (e-mail senders whose messages should always be blocked). Many of these products integrate smoothly with ISA Server. (For a list of these products, see http://www.microsoft.com/isaserver/partners.) A critical component in your efforts to keep unwanted e-mail out of your network is to implement multiple-level antivirus scanning. You should configure an antivirus scanner to scan all SMTP messages on the ISA Server or SMTP server through which the e-mail enters your organization. You should also enable an Exchange-specific antivirus product on your Exchange Server computers. Finally, make sure that the antivirus software on every user s desktop is functioning and up-to-date.
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