On Thu, 2011-01-13 at 22:01 -0500, Genes MailLists wrote:
> Its great to use procmail - however if spamassasin has tagged
> something as spam - there is no point in running sa-learn --spam on the
> what SA has already identified as spam - only use it on things it missed.

Training a bayesian filter with messages that it has classified
correctly is still beneficial.

Imagine a filter that was trained with exactly one ham and one spam
message. It's probably not going to do a very good job - but imagine you
get lucky and it correctly classifies a large number of messages.

Training the filter with those messages will still make it a much better
filter, as it will then have a much better idea of what your ham and
spam look like (i.e. it has a larger statistical sample to analyze).

That's the whole point of Spamassassin's autolearn plugin. It will
automatically train itself as it filters, as long as a message exceeds a
certain spam or ham threshold.

You can configure it with:

bayes_auto_learn 1
bayes_auto_learn_threshold_spam 12.0
bayes_auto_learn_threshold_nonspam 0.1

Those are the default threshold values, you can change them to whatever
you want. Note that autolearning spam requires at least 3 points from
the header, and 3 points from the body, so setting the spam threshold
lower than 6 will be the same as setting it to exactly 6.

You can see if your messages were autolearned by looking at the headers;
you will see one of these:

autolearn=ham
autolearn=spam
autolearn=no


Brian


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On Fri, 2011-01-14 at 00:08 +0000, Timothy Murphy wrote:

> Now I have to confess that the server involved is running Centos-5.5,
> not Fedora.

Later versions of spamassassin for CentOS 5 can be obtained from the DAG
repo (http://apt.sw.be/redhat/el5/en/) I installed version 3.3 from
there and it works quite well on my CentOS 5 boxes.

--Greg


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Greg Woods wrote:

> Later versions of spamassassin for CentOS 5 can be obtained from the DAG
> repo (http://apt.sw.be/redhat/el5/en/) I installed version 3.3 from
> there and it works quite well on my CentOS 5 boxes.

Thanks for that.
Actually, there didn't seem to be an RPM actually called spamassassin
(at least under the x86_64 branch I was looking at).
I wonder if spamass-milter is equivalent, or sufficient?

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s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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On 01/14/2011 06:09 PM, Timothy Murphy wrote:
> Greg Woods wrote:
>
>> Later versions of spamassassin for CentOS 5 can be obtained from the DAG
>> repo (http://apt.sw.be/redhat/el5/en/) I installed version 3.3 from
>> there and it works quite well on my CentOS 5 boxes.
>
> Thanks for that.
> Actually, there didn't seem to be an RPM actually called spamassassin
> (at least under the x86_64 branch I was looking at).
> I wonder if spamass-milter is equivalent, or sufficient?

spamass-milter is the "glue" to run SpamAssassin as a sendmail milter.
It is not SpamAssassin. You must install the SpamAssassin and sendmail
packages separately.

It is available from Fedora repos and ATRPMS. ATRPMS also carries
CentOS versions of its packages.

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On Fri, 2011-01-14 at 23:09 +0000, Timothy Murphy wrote:
> Greg Woods wrote:
>
> > Later versions of spamassassin for CentOS 5 can be obtained from the DAG
> > repo (http://apt.sw.be/redhat/el5/en/) I installed version 3.3 from
> > there and it works quite well on my CentOS 5 boxes.
>
> Thanks for that.
> Actually, there didn't seem to be an RPM actually called spamassassin
> (at least under the x86_64 branch I was looking at).
> I wonder if spamass-milter is equivalent, or sufficient?

Doubtful, that is just the interface to sendmail.

I can't honestly remember where I got it from originally, but a Google
search turns up the RPM at:

http://packages.sw.be/spamassassin/

--Greg



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