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Once a message has passed the IP address scrutiny of the connection filter, Exchange focuses on who the sender claims to be, based on e-mail address The Blocked Senders
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Microsoft Exchange Server 2007: A Beginner s Guide
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Figure 9-14 Sender ID validates the sender s IP with the claimed domain
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tab on the Sender Filtering properties, shown in Figure 9-15, allows you to enter both individual e-mail addresses as well as entire domains that should be blocked (you can include subdomains with a single entry) You can use this feature if there is a domain you feel you are receiving spam from (even though the sender believes their own messages to be legitimate); the sender may not meet the criteria of an IP Block list provider and their IP addresses may change periodically (a symbol of the sender being a spammer), so blocking based on sender address makes sense
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Managing Edge Transport Servers
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Figure 9-15 Block e-mail by individual addresses and domains
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This feature is useful when you don t want specific internal addresses to receive external messages As shown in Figure 9-16, you can block messages sent to addresses hidden from the global address list, as well as identify those recipients that should not receive external messages
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Microsoft Exchange Server 2007: A Beginner s Guide
Figure 9-16 Block e-mail sent to specific recipients
Sender Reputation (Protocol Analysis)
As previously mentioned in this chapter, Exchange calculates an SRL based on a few tests: HELO/EHLO analysis Reverse DNS lookup Analysis of SCL ratings on messages from the same domain Sender open-proxy tests
9:
Managing Edge Transport Servers
The first three tests happen without any configuration on your part The sender open-proxy test can be separately enabled or disabled on the Server Confidence tab of the Sender Reputation Properties dialog box Like the SCL, the SRL for a given sender is value from 0 to 9 You can establish the threshold level of a non-reputable sender and choose what Exchange should do on the Actions tab of the Sender Reputation Properties dialog box, shown in Figure 9-17 The only action Exchange takes based on SRL is to move the sender to the IP Block list (which, oddly enough, can contain more than just IP addresses) for the period you specify The range is from 0 to 48 hours The premise behind not making the block permanent is that this is an issue of reputation (which can change over a period of time) Don t worry if a sender continually is sending spam that triggers a high SRL, the sender will continually remain on the IP Block list
Figure 9-17 Determining the action to take based on SRL
Microsoft Exchange Server 2007: A Beginner s Guide
Figure 9-18 Adding an attachment filter
Attachment Filtering
This feature is last because the outcome of this filter is the removal of the attachment and not the message Therefore, all of the message-specific filters will determine if a given message can enter the organization, and then the attachment filter determines if the attachments are allowed Exchange allows you to block attachments based on either file name or MIME type File names can be either exact matches (such as maliciousfileexe ) or simply an extension (such as *mp3 ) You can find a list of MIME file types at www ianaorg/assignments/media-types To add an attachment filter, you will need to open the Exchange Management Shell and use the Add-AttachmentFilterEntry cmdlet An example of both commands can be found in Figure 9-18
SUMMARY
Microsoft has gone to great lengths to keep Exchange a productive messaging solution by introducing the Edge Transport server role By moving many of the functions previously accomplished internally on an Exchange server to a dedicated external server, internal messaging will function more efficiently and more securely This is the last server role focused chapter in the book In the next chapter, I ll switch gears and focus the next two chapters on administering Exchange clients
Administering Clients
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Administering Exchange 2007 Clients
Microsoft Exchange Server 2007: A Beginner s Guide
ntil now, I have focused on the server side of Exchange 2007 Server because this book is about administering Exchange However, it would do us well to go over the various clients that exist for Exchange 2007 Server and that you might find in your environment: Microsoft Outlook 2007 Previous versions of Microsoft Outlook Microsoft Outlook Express and other Post Office Protocol version 3 (POP3)/ Internet Messaging Access Protocol 4 (IMAP4) clients
While each of these clients can be used in an Exchange 2007 environment, I suspect that eventually most of you will be using Microsoft Outlook 2007 Now there is not enough room in this book to cover each of these clients in depth, so I will first cover the various types of supported clients and then spend most of this chapter focusing on Outlook 2007 and some of its new Exchange-specific features You ll also notice that Outlook Web Access and Outlook Anywhere (formerly RPC over HTTP) are not present in the list of clients covered in this chapter; these clients will be covered in 11
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