On Wednesday 29 March 2006 09:07, Roy Souther wrote:
> I use three steps.
> 1) Black lists from http://www.spamhaus.org/ ( blocks about 10% of
> spam )

http://www.email-policy.com/Spam-black-lists.htm

Has many more.

As for spamhaus,  I would say 10% is low ... even if just for the SBL list 
alone.  There is also the XBL list which incorporates :

- the CBL (Composite Block List) from cbl.abuseat.org
- the BOPM (Blitzed Open Proxy Monitor) from opm.blitzed.org
- the NJABL open proxy IPs list from www.njabl.org. 

And the sbl-xbl list which incorporates both.

sbl-xbl.spamhaus.org for the RBL entry in your mail server.

With that RBL entry and a couple of others (like open relays, and 
spamcop.net), your spam reduction would be much much greater than 10% for 
sure.

> 2) SpamAssassin ( identifies about 30% of spam )

I would suspect that would be correct using the default installation, and 
settings.  It becomes a much more efficient, and powerful tool if you add 
additional rule sets :

http://wiki.apache.org/spamassassin/CustomRulesets
http://www.rulesemporium.com/rules.htm

It also depends on how SA is setup.  Whether running globally, or per user, or 
through a milter (like amavis).  Amavis overrides the SA globals, and has 
it's own configurations (which are defaulted to higher values than SA 
distributed).  You have to tweak things for your setup ... there is no one 
answer.

In addition to that SA provides learning system.  You can "teach" SA to learn 
better what is SPAM by forcing a read, and also changing your false-positive 
matches into HAM by running a cron job, or some other means.  It is somewhat 
self learning by default as I recall.  

> 3) Spam bait ( blocks about 40% of spam )
>

never used it, can't say.




Andy

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