Turn on recipient validation in Exchange 2007
Configure SpamHaus or other RBL provider with Exchange 2007
June 10, 2009Changing Exchange 2007 receive connector timeout
June 10, 2009Open the exchange management shell and run the following commands
Run this command to view your current configuration
Get-RecipientFilterConfig | fl
Then run this command to turn on recipient filtering
Set-RecipientFilterConfig -RecipientValidationEnabled:$true
Turning on this feature will filter recipients who are not in the directory. This can unlload a ton of processing requests from your Exchange server.
