Hello,

On Thu, Oct 11, 2001, 20:53:58 GMT
  Stefan Jeglinski, <[EMAIL PROTECTED]> wrote:

>header:
>
>>Received: from opt20.edirectnetwork.net ([198.139.238.246] verified)
>
>Using the same resolver as the SIMS box is pointed to, I see:
>
><nslookup:opt20.edirectnetwork.net/A>
>Non-authoritative answer:
>opt20.edirectnetwork.net A 198.139.238.246
>
><nslookup:246.238.139.198.in-addr.arpa/*>
>Non-authoritative answer:
>246.238.139.198.in-addr.arpa PTR u-198-139-238-246.classichosting.net
>
><nslookup:u-198-139-238-246.classichosting.net/A>
>Authoritative answer:
>   Name Error - domain name referenced does not exist.
>
>
>I'm not concerned about the A and PTR not matching up or the A record
>not existing - these are pretty standard fare - but how does SIMS
>figure certain things out?
>
>I assume it starts with the HELO and looks up that domain name. If
>the HELO is "correct" and all is copasetic, it is "verified" and
>we're done.

And the connection's source IP matches the forward lookup result.

>If the HELO is not "real," SIMS still has an IP with which to do a
>reverse lookup. Does it do this reverse lookup and try to resolve the
>matter further, or does it always just stop there and place the IP
>and HELO in the header?

SIMS does not do reverse lookups.

Best regards,
Dmitry Akindinov

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