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Old 06-29-2008, 06:59 AM
John R Pierce
 
Default spam filtering with centos 5.2

In the past I've used a combination of spamhaus combined RBL's and
Spamassassin with Mailscanner as my spam recipe, but this stopped
working very well for me well over a year ago. As many of the users of
the couple small/personal mail servers I run are NOT technical people,
and use POP to read their mail, 'training' spamassassin is difficult at
best. Once upon a time, using the Rules Du Jour scripts from the SARES
project worked pretty well, but that has been shut down, and really
hasn't been functional in over a year.


I've just rebuilt a friends mail server with centos 5.2 (it was running
FC3 or something before) and would like to setup them up with a decent
anti-spam recipe that doesn't require extensive tinkering or training.

does anyone have a good recipe for this? Ideally I'd like something
purely RPM based that doesn't require extensive configuration and
tuning. I've never setup razor before, how well does that work if
the mail users aren't in a position to feed it training data?



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Old 06-29-2008, 08:31 AM
Kai Schaetzl
 
Default spam filtering with centos 5.2

John R Pierce wrote on Sat, 28 Jun 2008 23:59:38 -0700:

> In the past I've used a combination of spamhaus combined RBL's and
> Spamassassin with Mailscanner as my spam recipe, but this stopped
> working very well for me well over a year ago.

How come? I have several MailScanner machines with differing versions and
all are fine. About training: you don't really need to have manual
training. With the correct settings you get enough automatic training.
About SARE: spamassassin is getting updated own rules for a while now.

Kai

--
Kai Schätzl, Berlin, Germany
Get your web at Conactive Internet Services: http://www.conactive.com



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Old 06-29-2008, 10:46 AM
Ned Slider
 
Default spam filtering with centos 5.2

John R Pierce wrote:
In the past I've used a combination of spamhaus combined RBL's and
Spamassassin with Mailscanner as my spam recipe, but this stopped
working very well for me well over a year ago. As many of the users of
the couple small/personal mail servers I run are NOT technical people,
and use POP to read their mail, 'training' spamassassin is difficult at
best. Once upon a time, using the Rules Du Jour scripts from the SARES
project worked pretty well, but that has been shut down, and really
hasn't been functional in over a year.


I've just rebuilt a friends mail server with centos 5.2 (it was running
FC3 or something before) and would like to setup them up with a decent
anti-spam recipe that doesn't require extensive tinkering or training.
does anyone have a good recipe for this? Ideally I'd like something
purely RPM based that doesn't require extensive configuration and
tuning. I've never setup razor before, how well does that work if
the mail users aren't in a position to feed it training data?




John,

I wrote the Wiki pages on Postfix with restrictions and greylisting here:

http://wiki.centos.org/HowTos/postfix_restrictions
http://wiki.centos.org/HowTos/postgrey

I've found this setup to be highly effective in filtering spam (~99.6%)
without the need for any post-filtering such as SpamAssassin.


Helo restrictions alone take out about a third of spam on my mail server
and then I use the following RBL's:


zen.spamhaus.org
dnsbl-1.uceprotect.net,
dnsbl-2.uceprotect.net,
dnsbl-3.uceprotect.net,
psbl.surriel.com,
bl.spamcop.net,

followed up by greylisting to catch the remainder.

I've only seen a few false positives and they have mostly come from
using the dnsbl-3.uceprotect.net RBL. If you don't want to be too
aggressive, maybe drop this one from the list and see how you get on.


The only other recommendation I would make is to avoid catchall accounts
where ever you can and only accept mail for actual users.


If you then still find you want to run SpamAssassin and/or ClamAV to
filter the very small amount of spam that makes it through, check out
this Wiki page:


http://wiki.centos.org/HowTos/Amavisd

although I really haven't found the need to use any post-filtering with
the above setup.


Obviously the above is based on Postfix but equally applies to other MTA's.

Regards,

Ned

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