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inbound messages to an external service provider. The advantage of outsourcing message hygiene to a specialized third party is that you take advantage of their expertise in combating viruses and spam. Specialized providers have deep probes into the dark side of email and are always able to react quickest to new attacks when they develop across the Internet. In addition, you don t waste valuable administrator, network, and computing resources to deal with the vast amount of unwanted email that appears on your company s doorstep.

Deploy systems to cleanse inbound mail as it arrives at the company s network. The usual approach is to remove as many obvious problem items as early as possible by dropping any message that is not addressed to a recipient who can be found in Active Directory, and then apply a series of tests to determine whether items are spam, contain viruses, or have attachments with unwanted content. Suspicious items can be dropped or stripped of problematic content, and the cleansed stream is passed through to hub transport servers for delivery. The Exchange 2010 Edge transport server is designed to perform email cleansing, but you do not have to deploy Exchange Edge servers for this purpose, as many other solutions exist for the problem.

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Of course, security is best attained through multiple lines of defense. Client-side junk-mail features also make an important contribution to suppressing unwanted content arriving in user inboxes. It s tremendously difficult to protect users to a point where they never see spam or a virus never gets through. Spammers and hackers expend enormous amounts of time and effort to concoct new techniques to mask bad content so that it penetrates the defenses erected by companies to protect users. It therefore follows that user education must provide the final layer of defense, and users must be informed about the danger that spam and viruses represent and the actions that they should take if suspicious messages make it into their inbox. We ll discuss all these questions in this chapter.

The Microsoft proposition is that you should deploy Edge servers to protect Exchange organizations. This is certainly a valid option, but it s important to understand that alternatives exist that should be considered before you decide to deploy Edge servers. An Edge server is an attractive proposition to many companies that have a Windowscentric infrastructure. The major advantages of using an Exchange 2010 Edge server as the entry point to the organization are as follows: Because it s based on Microsoft Windows 2008 and Exchange 2010, the Edge server is a familiar place for administrators to work. The Edge server supports a comprehensive set of transport agents that examine inbound messages in different ways to detect problematic content.

The Edge server enjoys a close integration with Microsoft Forefront Protection for Exchange 2010 (FPE). If you have paid for enterprise Client Access Licenses (CALs), you can use FPE at no further expense to add sophisticated antivirus processing to the basic antivirus capabilities provided by the Content Filter agent. Automatic updates ensure that the antivirus data are always current. The synchronization mechanism allows the Edge server to share configuration and user information with the Exchange organization. Sharing configuration data eases the administrative load and access to aggregated data such as safelists collected from user mailboxes helps to reduce the number of false positives generated during antispam checking.

However, some companies might consider it better to deploy a non-Windows server in the perimeter network. This could be because they already have bastion servers deployed to process inbound email; it could be that they outsource message hygiene to a specialized vendor and receive a cleansed message stream from that vendor and so don t need to use a bastion server (a server designed to act as the initial entry point for email into a domain); or they might simply prefer to use a non-Windows platform for all computers deployed in the perimeter network because the company supports heterogeneous email systems that cannot take advantage of the Edge server capabilities. Every company has its own valid reasons for deciding what computers and operating systems to use for different tasks, and although the Microsoft-centric community might prefer to use the Edge server, it simply might not be possible to move along this route.

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