Block IP addresses and DNS in Exchange 2003

You can use the connection filtering and recipient filtering features in Microsoft Exchange

Server 2003 to help reduce unwanted mass e-mail or unsolicited commercial e-mail (UCE) in

your organization.

Connection filtering is used to configure Exchange Server to contact a Realtime Block List

(RBL) provider to determine whether the computer that an e-mail message is sent from

appears in a list of "blacklisted" computers. You can also configure exceptions to these

connection filters........

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