Re: Throttling mail

[Scott Call <scall () devolution com>]

On Thu, 25 Mar 2004, Adi Linden wrote:

> Does anyone have any resources on building a mail relay that would limit
> the amount of email a single user or ip address can relay over a given
> time period?
>
> I have a spam/virus problem that is getting out of hand.

Depending on your MTA poison of choice there's lots out there.  Personally
I use exim in most of my deployments, and it has a very nice progressive
rate limiting feature (ie accept two MAIL commands with no delay, at 0.5
seconds for the third, scaling at a rate a 1.05 times per message until 5
minute delay per message is reached) that is fully configurable.
(http://www.exim.org/exim-html-4.30/doc/html/spec_14.html#IX1351)

Exim, as well as almost every other MTA out there has support for inline
virus scanning, which may help with your problem as well.

-Scott


> Adi
>
>
>
>
> !DSPAM:4062fb3090826102911420!

-- 
Scott Call      Router Geek, ATGi, home of $6.95 Prime Rib
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