Additional Resources
Understanding Header Firewall: http://technet.microsoft.com/en-us/library/bb232136.aspx
Understanding Anti-Spam Stamps: http://technet.microsoft.com/en-us/library/aa996878.aspx
Sender Policy Framework – Project Overview: http://www.openspf.org/
Sender ID Framework SPF Record Wizard: http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/
Understanding Safelist Aggregation: http://technet.microsoft.com/en-us/library/bb125168.aspx
Publish certificates for external contacts in Active Directory: http://msexchangeteam.com/archive/2008/04/23/448761.aspx
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