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 > > --- > [This E-mail was scanned for viruses by Declude Virus > (http://www.declude.com)] > > --- > This E-mail came from the Declude.JunkMail mailing list. To > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > type "unsubscribe Declude.JunkMail". The archives can be found > at http://www.mail-archive.com. > --- > [This E-mail was scanned for viruses by Declude Virus > (http://www.declude.com)] > > --- > This E-mail came from the Declude.JunkMail mailing list. To > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > type "unsubscribe Declude.JunkMail". The archives can be found > at http://www.mail-archive.com. > --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.