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Re: [Asrg] A New Plan for No Spam / Velocity Indicator

2003-05-01 13:10:34
From: J C Lawrence <claw(_at_)kanga(_dot_)nu>

...
Requiring separate transactions for each addressee would increase the
load on the system by 10 times.

...
  Loose summary as I recall them: The optimal number of RCPT TOs per
  message for best performance outbound delivery is approximately 5, and
  is most definitely below 10.

Ok, requiring separate transactions would increase the load by 5 times.

...
Given a $2,000US commodity machine its just not that hard to sustain
2,500 outbound deliveries a minute these days.

Agreed, today the CPU and disk costs are far lower.  However, if you 
can run 2,500 outbound deliveries/minute at 5 addressees/transaction,
you'll only be able to run 500/minute at 1 addressee/transaction.

If each transaction involves a 5 KByte body and an ignored ~200 bytes
of SMTP commands and TCP/IP headers, then a T1 can carry about 38
deliveries/second or 2280 deliveries/minute.  That does not quite jibe
with 2500 deliveres/minute at 5 addressees/delivery, but it's the
right order of magnitude.  Perhaps the fact that I ignored DNS traffic
as as the TCP/IP headers and SMTP commands and responses is part of
the discrepancy.


Vernon Schryver    vjs(_at_)rhyolite(_dot_)com
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