From: Scott Nelson <scott(_at_)spamwolf(_dot_)com>
At 08:37 PM 5/8/03 -0400, Yakov Shafranovich wrote:
>
>>From: "Ken Hirsch" <kenhirsch(_at_)myself(_dot_)com>
>>
>>Does anybody have an idea of how many legitimate SMTP servers there are?
>>That is SMTP servers that are not used primarily for spam, have a static IP
>>address, and have been active in the last, say, 12 months.
>
>These might be a starting point:
>
>http://cr.yp.to/surveys.html
>http://www.isc.org/ds/
>
>From the first link, I see that on 2001-10-03,
D. J. Bernstein estimates over 4 million
(estimate made from a sample of 1 million random IPs)
42% ran some flavor of sendmail,
17% ran Microsoft Exchange or IIS.
17% ran qmail
(there were others, see the original survey)
His methodology looks good, I trust these numbers were reasonably
accurate in 2001-10-03. That was over 18 months ago,
a long time in internet years, but I think they probably haven't
changed all that much since then.
Does that means that for every IP address there are four SMTP servers? I
suggest we contact him and perhaps he can give us some more information and
maybe the raw data
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Yakov Shafranovich / <research(_at_)solidmatrix(_dot_)com>
SolidMatrix Research, a division of SolidMatrix Technologies, Inc.
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"One who watches the wind will never sow, and one who keeps his eyes on
the clouds will never reap" (Ecclesiastes 11:4)
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