> 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.

Lucky you.  We have a 1500/256kbps link for up to 20 boxes, though
there's talk of upgrading to (nominally) 8M/384kbps.

i have 300 users. and all works quite fast :)

> if you substract ACK's needed for 4Mbit/s download, little is left.

Slight exaggeration, though TCP downloads do need say 5-10% of download

count 10 as HTTP requests can be large. that's 400kbit/s from 512 available!

bandwidth upstream.  Sure, as soon as you use all upload bandwidth (your
mail example, torrents of course, youtube uploads etc) your download

ipfw rules make sure upload bandwidth isn't saturated. it's just a problem that few is left for something else

> is a problem now.

Why not add dummynet pipes and suitable rules to limit the outbound
bandwidth for mail (or torrents, whatever's a problem) to a maximum of
say 80% of upload, so for 512k set upload limit to maybe 400k, leaving

i am already doing this.
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