Michael Thomas - Mathbox wrote:
> It is an absolute possiblity. If you are using unmodified Windows DNS,
> NET:DNS will tie up CPU resources waiting for Windows DNS to time out on
> non-existent/very slow name servers during MX/A/PTR checks. On the otherhand
> RBLs normally respond in a resonable fashion, so RBL checks are rarely an
> issue.

"unmodified" ?  What do you mean?

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