In the last episode (Aug 15), Malcolm Kay said:
> This sort of takes us back one more level -- how does the DNS service decide 
> between responding with NXDOMAIN and a timeout/TRY_AGAIN? And does the
> difference have any real significance?

NXDOMAIN means that a server replied "this domain does not exist", and
usually indicates a forged or mistyped domain.  A timeout is just that. 
No authoritative servers replied, at all.  This is usually due to
misconfiguration or server failure at the domain in question, and
mailers should retry the lookup later.

        Dan Nelson
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