blacklisting a email address

How do I globally  stop an email from being delivered to all domain mailboxes. I am using Exchange 2007 and Symantec version 6.5 Symantec Security for Microsoft Exchange. The email I want to blacklist globally is "postmaster@ourdomaIn.com
sand210Asked:
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OriNetworksConnect With a Mentor Commented:
Specific to exchange 2007 https://technet.microsoft.com/en-us/library/bb123706(v=exchg.80).aspx

Edge Transport->AntiSpam->Sender filtering->Blocked Senders->Add

or from exchange management shell

Set-SenderFilterConfig -BlockedSenders postmaster@domain.com
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