Thanks for the clarification. I just received this "reject" notice when sending 
a test msg. So, if I understand correctly, it is non-deliverable from the 
outside world and can simply be used as the "From:" address in my MUA?

<[email protected]>: host mx1.redhat.com[209.132.183.28] said: 550 5.1.1
<[email protected]>: Recipient address rejected: User unknown in
local recipient table (in reply to RCPT TO command)
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