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sockching

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Hi,

I am a new user to Kerio Mail. Kerio mail has successfully reduced our spam mail to 50% compared to previous mail system. We are glad and happy with it. Somehow, some users still continue recieving spam mail where the sender from, subject and domain are different everyday, but the contents are almost the same. I found that Kerio Spam filter also using Bayesian, but how do I know it is working? and how it actually work to prevent spam mail?

I hope somebody can help me with this. Our objective to change to Kerio Mail Server is to eliminate the spam mail and viruses.

Need help.
SC Tan
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Zakk

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You can detect that very easy by yourself:

- switch on every log event (right mouse-klick -> set log events in log window)
- switch on backup for every mail

every mail which is sended over KMS you can find in the logs and a copy in the backup folder.

be sure that you your relay only works with authentication.
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jshaw541

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- switch on every log event (right mouse-klick -> set log events in log window)

This does not make sense to me. Can you elaborate on these instructions?

TIA

Kerio MailServer 6.7.1 w/AD
Windows Server 2003 SP 1
Dell PowerEdge 2850 (Dual Xeon 3.2ghz and 2 GB RAM)
~1300 users
~1000+ concurrent IMAPS connections
iPhone users
Outlook 2007 KOFF users
Apple iCal 10.5/10.6 users
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sockching

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Hi Zakk,

Thanks for your suggestion. I did set the log and backup and I found the backup of mail is apply to mails that have been filtered by spam and antivirus. I set spam action whenever >5.00 score will be silently discard.

Yesterday I have tried to add some free DNS blacklist database and it work fantastically. I really love that.It helps reduce about 10% of spam filter's task.

But it still not 100% spam free. Wonder any other ways to ensure 100% spam free mail?

Thanks.

SC.
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Zakk

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you will never get 100% perfect spam filtering without loss of non-spam mails.

the engine has a self-learning logic built in, when you put down the breaking score too much you declare many non-spam mails as spam which must be sorted manual.

if you raise the score you have more spam in your inbox.

try to optimize and find a good balance between the two cases.
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sockching

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Hi Zakk,

I wonder how Bayesian filter work? As I gathered from some online resources, the filter need to learn for spam and ham. Kerio Technical support also mentioned that Kerio Mail already bundle with Bayesian filter, but they recommend me to look for the answer from Kerio Forum on how it works.

As mentioned by you, the engine has a self learning logic, but I don't see that it works! For example, If I put a rule to deny incoming mail with subject viagra, somehow the word viagra will be replaced by vi-agra, via-gra, vi<at>gra and such, Kerio Mail filter failed to detect that as spam when the string substitute with others. So, spam mail continue to flood my mailbox with new string to replace the word viagra.

It seems like the filter did not learn, right? Can you teach me how to actually make the filter learn what is spam and ham?
Thanks.

SC.
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