Help with mails from postmaster@

We are using SmallBusiness Server 2003. In Exchange, I notice that there
are some mails going out from postmaster@xxxxxxxxxxxxxx None were
actually sent. So I would like to see what they are. How can I see those
emails ? I tried to create an account postmaster. But exchange server
says it is already inbuilt and is creating postmaster2. Is there anyway
that I check this emails ?

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