[Dovecot] Spam filtering

[Patrick Nagel]

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On 2009-12-11 13:14, Timo Sirainen wrote:
> On Dec 10, 2009, at 11:51 PM, Patrick Nagel wrote:
> 
>> Of course initial training is necessary. For ongoing training /
>> feedback I have set up a Spam/Learn-Spam and Spam/Learn-Ham mailbox
>> into which I move false negatives/positives.
> 
> Then again there are people like me who get mostly english mails, and
> a couple of legitimate finnish ones per month. And all of those
> finnish ones get 99% bayesian spamness from SpamAssassin so I can't
> rely on just that.. But anyway, SA works pretty nicely. Just today I
> looked through several months of my Spam mailbox and there was just
> one false positive (someone wanted urgent Dovecot support a month
> ago, seemed like a bad idea to reply to it).

I think if you trained a couple hundred (non-Spam) Finnish mails as ham,
the Bayesian filter would work fine for you. But yes, having that kind
of imbalance between two (or more) "classes" of mails certainly makes
Bayesian filtering less reliable.

Patrick.

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