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Date: Sun, 15 Jun 2008 12:19:35 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: perryh@pluto.rain.com
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Cc: freebsd-questions@freebsd.org
Subject: Re: sendmail's outgoing IPs
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>
> Pardon my lack of imagination, but how could anyone -- other
> than a spammer -- be generating enough outbound email traffic
> to *need* to load-balance it, and yet have little enough
> total Internet traffic to be using DSL rather than something
> oriented to commercial use (like a T1)?

the reason is simple

something like "T1" here costs far too much to dedicate it just for mails.

for the same price i can get four "4Mbit/s" ADSL's (which i have now), 
that actually gives 4Mbit/s download speed, but only 512kbps upload.
if you substract ACK's needed for 4Mbit/s download, little is left.
my ipfw rules manages all this so web browsing works fine, but mail output 
is a problem now.