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Subject: Re: MTA's (was: VERY large mailing lists.)
From: Rich Pieri <rich . pieri @ prescienttech . com>
Date: 14 Jul 1998 12:41:47 -0400
To: majordomo-users @ greatcircle . com
In-reply-to: Dave Sill's message of "Tue, 14 Jul 98 10:20:13 EST"
Mail-copies-to: never
References: <19980714120307.27531.qmail@sws5.ctd.ornl.gov> <Pine.BSI.3.95.980714071401.19162G-100000@queernet.queernet.org> <19980714142013.29684.qmail@sws5.ctd.ornl.gov>

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Dave Sill writes:

> I think it's kinder to spread the load out than to concentrate it at
> the point where the system is most loaded.

Say you have 20 messages you need to deliver to AOL.  sendmail and exim
create one SMTP connection and deliver the 20 messages sequentially; the
AOL MX needs one instance of its MTA to handle this traffic.  qmail creates
20 simultaneous SMTP connections and delivers all 20 messages
simultaneously; the AOL MX needs 20 instances of its MTA to handle this
traffic.

In plain English, qmail generates 20 times the instantaneous load on the
remote machine as either sendmail or exim.  In plain English, qmail
deliberately hammers a remote system at the point it is most loaded.

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-- 
Rich Pieri <rich.pieri@prescienttech.com> / Do not use Happy Fun Ball on
Sysmonster, Unix Wrangler                / concrete.
Prescient Technologies, Inc.            / 
I speak for myself, not PTI or SWEC    / 



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