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Turn on recipient validation in Exchange 2007

Open 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.