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In Exchange Server 2007, you can customize the Delivery Status Notification (DSN) text, not the numeric SMTP response code.
Use the following shell command to create a new DSN. These can be created in different languages/locales. You can also use different DSN text for a particular response code (for example, 5.7.1) for internal and external senders:
New-SystemMessage -DsnCode 5.7.1 -Language En -Text "Message rejected by the cool content filter" -Internal $false
More details:
How to Create a New DSN Message
http://technet.microsoft.com/en-us/library/aa996803(EXCHG.80).aspx
Last Answered:
Apr 23 2008 11:07 AM GMT by Bsuneja 
615 pts.