> -----Original Message-----
> From: ntisp-request@iea-software.com
> [mailto:ntisp-request@iea-software.com]On Behalf Of David Payer
> Sent: Sunday, March 07, 1999 8:43 AM
> To: ntisp@iea-software.com
> Subject: Re: [NTISP] Spam Filtering
>
>
> >As for reverse DNS, the only thing I have seen where it is even remotely
> >useful is for companies who use a reverse lookup in conjunction with a
> whois
> >trace to determine whether or not you are eligible to download a strong
> >encryption product. And even then, all one needs is a shell
> account in the
> >U.S. to get around that.
> >
>
> You are correct that those who know how to can easily bypass the issue of
> screening against reverse lookups. But my point is this: the MAJORITY of
> spam comes from those marketers who want to find a quick way to send out
> multiple thousand emails. I did a review of logs for rejected
> addresses and
> tested many by telnetting back to port 25. Over 95% of those
> tested did not
> respond on that port. For the more dedicated spammers, the Real Time
> Blackhole List filters will be helpful.
>
> My problem when I do filtering is that some corps use firewalls
> and don't do
> inverse addressing and then their workers send mail back to their home
> account on our service and we reject it due to inverse addressing
> filters. I
> find that there are administrators who will reject you out of
> hand regarding
> setting up their network with this one precaution.
>
> I again assert, if we don't make efforts to stop spam ourselves, we will
> have governmental assistance in doing that. This will come with an
> accompanying tax to pay for administrating it. Once that mechanism is in
> place, the influence will grow (remember: income tax was
> originally never to
> exceed 3%).
>
> OK </republican-jargon>
>
> David Payer
>
>
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