Fwd: Re: Digital Island sponsors DoS attempt?
Adam McKenna
adam-nanog at flounder.net
Mon Oct 29 05:53:24 UTC 2001
On Sun, Oct 28, 2001 at 09:26:39PM -0800, JC Dill wrote:
> >Since most of what MAPS is about is reducing complaints from customers to
> >their ISP, and thereby reducing support costs, I guess the question is
> >answered. If no one complains, there is no problem. Since no one can
> >complain about unseen messages, that means that collateral damage is not
> >really a problem, since it does not increase support costs.
>
> Hi, Bob? This is Susan. I haven't received a reply from you regarding the
> email I sent yesterday, did you get it? You didn't? Hmmm. Let me try
> resending it.
>
> Hi Bob? This is Susan again. Did you get that second email
> yet? No?! Maybe you should call your ISP to find out why! Yes, I
> already called mine, they don't have any info, they say the mail server
> logs show that both the messages were delivered to your ISP.
>
> Hi, Mr. ISP support guy? This is Bob. It seems that I'm not getting all
> of my email....
You're assuming that the filterer is silently discarding the message and not
bouncing it. If a site is blocked from sending mail via MAPS or any other
method, the receiver must send a bounce message to the sender to avoid
breaking SMTP.
Assuming the filterer is not breaking SMTP by silently discarding messages,
Bob will receive a message saying that his message couldn't be delivered,
with an explanation.
--Adam
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Adam McKenna <adam at flounder.net> | GPG: 17A4 11F7 5E7E C2E7 08AA
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