TAILIEUCHUNG - Exxhange SQL And IIS- P93

Exxhange SQL And IIS- P93:The following legacy Exchange features have been de-emphasized in Exchange Server 2007. What does that mean? It means that these features are still included in the Exchange product, but they’re not prioritized anymore, and will most likely disappear in the next Exchange release after Exchange Server 2007 | Managing the Edge Transport Server Chapter 7 437 If you want to see a list of the current settings for AttachmentFilterListConfig type Get-AttachmentFilterListConfig and press Enter see Figure . Figure The Attachment Filter List Configuration Settings For any additional information on how to configure the attachment filtering behavior using the Set-AttachmentFilterListConfig CMDlet see the Exchange Server 2007 Help file or type Get-Help Set-AttachmentFilterListConfig in the EMS. Sender Reputation The Edge Transport server also includes a brand-new antispam feature called Sender Reputation. The Sender Reputation agent which is enabled by default although only for externally received messages is an antispam feature that blocks inbound messages according to characteristics of the sender. The agent actually relies on persistent data about the sender so that it can determine which action to take on inbound messages. 438 Chapter 7 Managing the Edge Transport Server The Sender Reputation agent analyses whether a sender forges the HELO EHLO statement when establishing an SMTP session to the edge transport server. This is done on a per-sender basis which makes it easier to see whether it s a spammer or a legitimate sender. A spammer typically provides many different unique HELO EHLO statements in a specific time period and they often also provide an IP address in the HELO EHLO statement that doesn t match their original IP address that is the IP address from which the connection originated . In addition they often try to provide a local domain name which is the name of the organization to which the Edge Transport server belongs. In most cases the behavior of a legitimate sender is to use a different but more constant set of domains in the HELO EHLO statement. The Sender Reputation agent also performs a reverse DNS lookup when an external SMTP server establishes an SMTP session. This means that the edge transport server verifies that the IP address of the SMTP .

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