How do I block individual email addresses and send a bounceback message using Symantec Mail Security 5.0.1?

We use Symantec Mail Security 5.0.1.

I want to block some individual email addresses and send a bounce back message telling them they have been blocked.

I have tried to go into Policies --> Sender Groups and use the Blocked Senders (Domain Based) but it continues to allow the email messages to be received.

Can anyone help explain how to get this accomplished?
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MikeinMilwAuthor Commented:
I was able to find some solutions/information on the Symantec forums.  Here is the thread in case anyone else has this issue:

after you added the domain....did you deployed the changes?
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