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Baysian filter little effective

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Alex99 View Drop Down
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    Posted: 15 July 2005 at 4:12pm

Hi, I have configured Baysian filter for many months, and now past 5000 messages learning curve. I have yet to see filter stop a single spam message. Can anyone share how we can all improve Baysian filter? I have tried lowering triger point to 77% the other day and spam never detected.

i have enabled reporting and see activity reported so it works i imagine.

I am concerned that Baysian filter does take lot CPU time and no results!!! Is algorithm weak? or are we doing something wrong?

Any comments welcomed

Alex99

 

 

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LogSat View Drop Down
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Joined: 25 January 2005
Location: United States
Status: Offline
Points: 4066
Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 15 July 2005 at 11:25pm
Alex99,

Please note that the Bayesian filter is the last filter to be used to detect spam. It's used only after all the other filters have tried to test the email from spam. As such, it is less likely to find spam than all the other  filters, since most of it will have been stopped already.

Can you try running the following query on the database? It returns a list of how many emails in the quarantine have been blocked by the various rules

SELECT tblQuarantine.RejectID, tblRejectCodes.RejectDesc,
COUNT(tblQuarantine.RejectID) AS Total
FROM tblQuarantine INNER JOIN
tblRejectCodes ON tblQuarantine.RejectID =
tblRejectCodes.RejectID
GROUP BY tblQuarantine.RejectID, tblRejectCodes.RejectDesc


As a comparison, this is what our own stats look right now for our mailserver:

57819    IP found in MAPS search
19328    IP address is from a blacklisted country
9189    URL in email found in SURBL search
6204    Invalid sender domain MX record
4803    SPF Sender Policy Framework match
1165    Keywords found in content
1154    Exceeded maximum number of RCPT TO
721    Mail From and Mail To domains are equal
397    Virus Found in email
281    IP blocked by honeypot entry
168    Statistical filter match
4    Domain is in local blacklist file
2    Mail From and Mail To are equal


Edited by LogSat
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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Clutcher View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clutcher Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2005 at 4:54am

Since I see posts from other people who can't have the bayes filter to kick in, I would just notice that I'm still not able to, too. Here's my report after a complete db reset some weeks ago on a 2.5.1.441 running on NT server and MS Sql

RejectID,RejectDesc,Total
8,IP address is from a blacklisted country,8752
12,IP found in MAPS search,1958
13,Keywords found in content,4376
15,SPF Sender Policy Framework match,668
16,Invalid sender domain MX record,1932

Ciao

 

MArco

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