Re: [Exim] Final Peer Review Sought: "Spam Filtering for MXs…

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Autor: Kjetil Torgrim Homme
Fecha:  
A: Tony Finch
Cc: exim-users
Asunto: Re: [Exim] Final Peer Review Sought: "Spam Filtering for MXs" HOWTO
On Fri, 2004-07-16 at 11:27 +0100, Tony Finch wrote:
> I note that on the page
>     http://slett.net/spam-filtering-for-mx/x519.html
> you say: "Bayesian Filters. These require training before they are useful"

>
> This is not the case: SpamAssassin in auto-learn mode and without
> additional training is better than plain SpamAssassin, so is suitable for
> an unsupervised site-wide installation without per-user configuration.


it didn't take long before the site-wide Bayesian database was seriously
detrimental to SpamAssassin's performance here at the University of
Oslo. a site-wide database will only work if your user base is
reasonably homogenous, I think. we have students and professors from
all over the world, discussing all kinds of subjects in all kinds of
languages, and the database ended up giving most spam -4.90 points.
(this was around New Year, things may have improved.)

> I thoroughly recommend the following paper for a very thorough analysis of
> the leading open-source anti-spam software.
>     http://plg.uwaterloo.ca/~gvcormac/spamcormack1.pdf


thank you for the link!

--
Kjetil T.