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Windows® Essential Business Server 2008 Administrator's Companion by J. C. Mackin, Charlie Russel

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Task 12: Configure DNS Sender ID

Sender ID is a system that helps counter e-mail spoofing by verifying the e-mail servers from which messages are sent. Sender ID validates the origin of e-mail messages by comparing the IP address of an e-mail message’s sender to the purported owner of the sending domain. Configuring the DNS Sender ID will take approximately 30 minutes.

What is an SPF record?

In Sender ID, each organization registers with the public DNS servers a special Sender Policy Framework (SPF) record that associates the organization’s own DNS domain (such as Fabrikam.com) with its valid e-mail server or servers. When an inbound e-mail server on the Internet receives an e-mail message from a given source, that e-mail server queries public DNS ...

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