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Blocking spam with Exchange Server 2003

Written by IT News on 10:08 PM

Microsoft Exchange Server 2003 now has built-in Open Relay Filter (ORFilter) or DNS Blacklist and Realtime Blackhole List (DNSBL, RBL) capabilities, which releases us from the need to rely on 3rd party software for the spam filtering.

Update - Exchange Intelligent Message Filter

Microsoft Exchange Intelligent Message Filter (IMF) was first released at the end of May 2004.

Microsoft Exchange Intelligent Message Filter is a product developed by Microsoft to help companies reduce the amount of unsolicited commercial e-mail (UCE), or spam, received by users.

Intelligent Message Filter is based on Microsoft SmartScreen Technology from Microsoft Research. By using e-mail characteristics tracked by SmartScreen technology, Intelligent Message Filter can help determine whether each incoming e-mail message is likely to be spam. Based on this likelihood, you can choose to block e-mail messages at the gateway or at the mailbox store.

Note: The Intelligent Message Filter is not supported in a clustered environment. Therefore, Intelligent Message Filter updates are not offered to Exchange Server 2003 servers in a clustered environment.

Exchange Server 2003 SP2 Update Note: IMF used to be a stand-alone tool downloadable from Microsoft. Although one can still download and install it separately (here, if you insist, but you don't need it anymore), IMF is now an integral part of Exchange Service Pack 2 (SP2). You can learn how to configure it on SP2 by reading Configure Intelligent Message Filter in Exchange 2003 SP2.

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