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Exchange Server 2003 has a rich set of filtering options to let you control what e-mail you allow. You can t stop all the spam sent to your organization with Exchange filtering, but you can definitely put a dent in it. Exchange Server supports three basic types of filtering:

Sender filtering Messages are blocked based on who the sender is. Connection filtering Messages are blocked based on the connection

MSN Calendar, where you can keep track of appointments, tasks, and reminders. MSN Explorer can send a reminder to you via e-mail, MSN Messenger, or your cell phone. MSN Communities, where you can interact online with others who share common interests. You can join an existing community or start your own. MSN Custom Web Sites, which makes it easy to create your own Web site to share photos and files with other people around the world. MSN eShop, where you can research products, compare prices, and make online purchases from hundreds of retailers. MSN Hotmail, which you can use to send and receive e-mail messagesfor free. MSN Messenger Service, which you can use to send instant messages and files to your friends who are online, or even converse with them over the Internet, using a microphone. MSN MoneyCentral, where you can track your accounts and pay your bills online. MSN Music, which helps you find online radio stations that suit your taste, based on favorite songs, artists, albums, or just your general mood.

Sender Filtering By default, no domains or senders are filtered. You can add individual senders or entire domains that will be blocked. You can also control how blocked messages are treated.

1. Select your Exchange server under the Advanced Management section of the Server Management console. 2. Double-click Global Settings in the details pane. 3. Right-click Message Delivery and select Properties to open the Message Delivery Properties dialog box. Click the Sender Filtering tab, as shown in Figure 14-35.

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4. Click Add to open the Add Sender dialog box where you can type the sender s e-mail address. You can use wildcards to block an entire domain, as shown in Figure 14-36. After typing the new address, click OK to return to the Sender Filtering tab.

Figure 14-36.

MSN Explorer also integrates with Windows Media Player, so you can listen to music or watch a video while you're surfing the Web or sending e-mail. When you sign in to MSN Explorer, you are automatically signed in to the other services that are password-protected, so you don't have to retype your password when moving between them. Important Don't confuse MSN Explorer with MSN Internet Access. The Microsoft Network (MSN) spans a number of services including all of those listed above. MSN is also an ISP through which you can configure a local dial-up account from almost any lo-cation in the world. Along with your Internet access, you can also get an MSN e-mail address (someone@msn.com) that is part of the Passport program.

5. Click Edit to modify a current blocked sender, or click Remove to remove the sender from the list. 6. Select the Archive Filtered Messages check box if you want to archive messages that you ve blocked. Caution

If you archive filtered messages, there is no automatic process to clean up the archive, which can grow very large very quickly. Make sure that cleaning up this archive is part of your regular Exchange maintenance.

7. Select the Filter Messages With Blank Sender check box to disallow messages that have a blank From field. 8. Clear the Drop Connection If Address Matches Filter check box if you don t want to automatically drop the SMTP connection when you recognize that a message should be blocked. Tip

The Drop Connection If Address Matches Filter check box is selected by default and we think that s a good thing.

9. Click Apply to apply your filters. You get the message shown in Figure 14-37, warning you that the filtering won t actually happen until you enable it for specific SMTP virtual servers. Click OK, and then click the Connection Filtering tab to configure filtering by IP address and block list service providers.

MSN Explorer is available in specialized versions for many international locations. The versions that are available at the time this book is being written, or that are under development, include:

Figure 14-37.

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Connection Filtering By default, connection filtering is not configured. To configure blocking by block lists and by specific IP addresses, use connection filtering.

1. Make sure the Message Delivery Properties dialog box is open and click the Connection Filtering tab, as shown in Figure 14-38.