[unisog] spam detection rates

Eric Peters epeters at pcthome.com
Tue Nov 16 22:14:50 GMT 2004

Do you guys plan on releasing the paper if so I would like to give it a
read maybe a step by step guide on getting it setup and your trials and
tribulations in doing so. One question I have though is how did you get
Dspam and SA to play nice with each other? I tried a similar setup but
failed miserably and just stuck with MailScanner which works great.


On Wed, 2004-11-17 at 08:27 +1300, Russell Fulton wrote:
> Hi Folks,
> 	 Recently a colleague (Bojan Zdrnja) and I gave a paper at a local
> Tertiary IT conference about dealing with spam an malware.  Bojan
> described our new mail system that he had designed and implemented
> (postfix, spamassin, amavisd, sophos -- with Dspam and clamav as
> secondary AV and spam detection).
> As part of the preparation for this talk we tried to estimate just what
> the real rate of spam detection was by selecting a few addresses that
> attract a lot of spam (mine was one) and examining a weeks worth of
> mail.
> We were rather chuffed to find that out of nearly 400 spam messages
> delivered to my account only three made it through with out being
> recognised as spam.  There was also a couple false +ve but they were a
> deliberate plant -- I signed up to a the digest of a support group for a
> medical condition that my wife subscribes to.  The digest contains up to
> 30 emails with lots of medical terms and symptom descriptions along with
> urls for useful products.  Her ISP's spam filter regularly tags it as
> spam so we thought we would try it through our system.
> Anyway, to the point of this post.  In our test our system delivered
> over 99% accuracy in identifying spam over the period of a week for a
> few selected accounts. (We have had four complaints in six months about
> false positives).  Does anyone else have figures for their systems that
> they would care to share.
> I now see less than one piece of spam a day (I have had 13 so far this
> month).

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