Thanks Andrew -
Nick
From: "Colbeck, Andrew" <[EMAIL PROTECTED]>
To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
Subject: RE: [Declude.JunkMail] [IMail Forum] Continuous statistical
filte
r updates?
Date sent: Wed, 4 Feb 2004 09:21:04 -0800
Send reply to: [EMAIL PROTECTED]
> It is more precise to say that Bayesian filters are best suited to
> individual mailboxes, and on the opposite scale they are not effective
> when the message base is random.
>
> Bayesian filters need to be trained, and for that you need a corpus of
> messages that is spam and another that is ham. The better the
> training, the better the result, and the reverse is true: garbage in,
> garbage out. Likewise, you need something or someone to keep feeding
> the algorithm: what were the false positives and what were the false
> negatives.
>
> This makes Bayes ideal for a single user yet makes it poorly suited to
> an ISP.
>
> If you want to implement Bayes for a corporation, you will do better,
> because more messages will be "on topic" and more and more we are all
> receiving similar spam. The catch is in training.
>
> You may find that Bayes is not worth using, but that the filters in
> SpamAssassin are worth keeping.
>
> Andrew 8)
>
> -----Original Message-----
> From: Nick Hayer [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, February 04, 2004 8:05 AM
> To: [EMAIL PROTECTED]
> Subject: Re: [Declude.JunkMail] [IMail Forum] Continuous statistical
> filter updates?
>
>
> <thread originally from imal list>
>
> Scott - & others regarding SpamAssassin
>
> In your opinion:
>
> > Correct. That's why for statistical filtering to be effective, you
> > need to have very small "groups" that receive similar E-mails.
> > Ideally, each user will have their own statistical database. If
> > not, per-domain can sometimes be acceptable. Server-wide
> > statistical databases fare worse.
>
> I have baynesian filtering enabled on Sandy's implimentation of
> SpamAssassin server wide. Am I just wasting cpu cycles/decreasing SA
> effectiveness by including this?
>
> Thanks
>
> -Nick Hayer
>
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