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Old 06-04-2008, 08:53 PM
Alain Terriault
 
Default sendmail and spam

Hi,

What is todays most effective combination to filter spam ?

On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
good, but with the current setup we are getting way to much spam.

Looking around I found new players, well some I did not know then and
they are very interesting..

MailScanner .. http://www.mailscanner.info/
Sagator .. http://www.salstar.sk/sagator/
Smf .. http://smfs.sourceforge.net/index.html
dspam .. http://dspam.nuclearelephant.com/index.shtml

I am tempted to go with smfs because it is familiar .. but, mailscanner
seems popular

thanks,
alain

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Old 06-04-2008, 09:02 PM
Kirk Bocek
 
Default sendmail and spam

Alain Terriault wrote:
> Hi,
>
> What is todays most effective combination to filter spam ?
>
> On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
> good, but with the current setup we are getting way to much spam.
>
> Looking around I found new players, well some I did not know then and
> they are very interesting..
>
> MailScanner .. http://www.mailscanner.info/
> Sagator .. http://www.salstar.sk/sagator/
> Smf .. http://smfs.sourceforge.net/index.html
> dspam .. http://dspam.nuclearelephant.com/index.shtml
>
> I am tempted to go with smfs because it is familiar .. but, mailscanner
> seems popular

I've been very happy using the RBLs with Sendmail. In sendmail.mc add:

dnl #
dnl # dnsbl - DNS based Blackhole List/Black List/Rejection list
dnl # See http://www.sendmail.org/m4/features.html#dnsbl
dnl #
FEATURE(`dnsbl', `bl.spamcop.net', `"Spam blocked see:
http://spamcop.net/bl.shtml?"$&{client_addr}')dnl
FEATURE(`dnsbl', `cbl.abuseat.org', `"Spam blocked see:
http://cbl.abuseat.org/lookup.cgi?ip="$&{client_addr}')dnl
FEATURE(`dnsbl', `sbl.spamhaus.org', `"Spam blocked see:
http://spamhaus.org/query/bl?ip="$&{client_addr}')dnl
FEATURE(`dnsbl', `list.dsbl.org', `"Spam blocked see:
http://dsbl.org/listing?"$&{client_addr}')dnl
FEATURE(`dnsbl',`dnsbl.sorbs.net',`"554 Spam blocked " $&{client_addr} " found
in dnsbl.sorbs.net"')dnl
dnl #
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Old 06-04-2008, 09:07 PM
Scott Silva
 
Default sendmail and spam

on 6-4-2008 1:53 PM Alain Terriault spake the following:

Hi,

What is todays most effective combination to filter spam ?

On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
good, but with the current setup we are getting way to much spam.

Looking around I found new players, well some I did not know then and
they are very interesting..

MailScanner .. http://www.mailscanner.info/
Sagator .. http://www.salstar.sk/sagator/
Smf .. http://smfs.sourceforge.net/index.html
dspam .. http://dspam.nuclearelephant.com/index.shtml

I am tempted to go with smfs because it is familiar .. but, mailscanner
seems popular

thanks,
alain
I really like MailScanner. You can add it to your current system with very
little effort, and add virus scanning very easily.
You will still need to spend time training and maybe write an occasional
spamassassin rule, but that is just the nature of the game anymore. Spam
changes constantly, and you have to change with it.


--
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

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Old 06-04-2008, 09:08 PM
Craig White
 
Default sendmail and spam

On Wed, 2008-06-04 at 16:53 -0400, Alain Terriault wrote:
> Hi,
>
> What is todays most effective combination to filter spam ?
>
> On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
> good, but with the current setup we are getting way to much spam.
>
> Looking around I found new players, well some I did not know then and
> they are very interesting..
>
> MailScanner .. http://www.mailscanner.info/
> Sagator .. http://www.salstar.sk/sagator/
> Smf .. http://smfs.sourceforge.net/index.html
> dspam .. http://dspam.nuclearelephant.com/index.shtml
>
> I am tempted to go with smfs because it is familiar .. but, mailscanner
> seems popular
----
I use MailScanner but it still uses spamassassin.

I use postfix and greylisting and block e-mails that coming from hosts
that don't resolve by reverse dns or for that matter don't have valid
hostnames. I also use some rbl's.

Those things alone and greylisting knock down most of it so spamassassin
has a much lighter load and MailScanner is awesome.

Craig

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Old 06-04-2008, 09:17 PM
Paul Heinlein
 
Default sendmail and spam

On Wed, 4 Jun 2008, Alain Terriault wrote:


What is todays most effective combination to filter spam ?


We use a three-way combination (on a CentOS 5 base), in this order:

1. sbl-xbl.spamhaus.org
2. clamav-milter
3. spamass-milter (milter-ized spamassassin)

Our server only handles about 50 user accounts, so it's not an
industrial-strength setup by any means -- though our uptime is well
above our internal SLA, and most of our employees have a fairly active
e-mail life. :-)


All bounces happen during the SMTP transaction, so there's no
backscatter problem.


In a typical week, spamhaus will block ca. 60% of inbound traffic,
spamassassin 10%, and ClamAV 2-3%. We end up delivering only about 25%
of the messages we receive from the Internet.


We use rpmforge packages for everything.

--
Paul Heinlein <> heinlein@madboa.com <> http://www.madboa.com/
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Old 06-04-2008, 09:36 PM
Ned Slider
 
Default sendmail and spam

Craig White wrote:

On Wed, 2008-06-04 at 16:53 -0400, Alain Terriault wrote:

Hi,

What is todays most effective combination to filter spam ?

On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
good, but with the current setup we are getting way to much spam.

Looking around I found new players, well some I did not know then and
they are very interesting..

MailScanner .. http://www.mailscanner.info/
Sagator .. http://www.salstar.sk/sagator/
Smf .. http://smfs.sourceforge.net/index.html
dspam .. http://dspam.nuclearelephant.com/index.shtml

I am tempted to go with smfs because it is familiar .. but, mailscanner
seems popular

----
I use MailScanner but it still uses spamassassin.

I use postfix and greylisting and block e-mails that coming from hosts
that don't resolve by reverse dns or for that matter don't have valid
hostnames. I also use some rbl's.

Those things alone and greylisting knock down most of it so spamassassin
has a much lighter load and MailScanner is awesome.


Same here - I use a 3 phase approach to pre-filtering spam. I use
postfix restrictions (requiring a FQDN helo hostname blocks ~30% on my
server), DNSBL's (zen.spamhaus.org, dnsbl-1.uceprotect.net,
psbl.surriel.com, bl.spamcop.net) and greylisting which in combination
blocks >99% of all spam _before_ it enters the server and needs any
costly post-filtering by SpamAssassin/ClamAV etc. It's an extremely
effective solution for me (YMMV).


Ned


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Old 06-05-2008, 12:01 AM
Michael Nelson
 
Default sendmail and spam

Scott Silva wrote:
on 6-4-2008 1:53 PM Alain Terriault spake the following: I really like
MailScanner. You can add it to your current system with very little
effort, and add virus scanning very easily.
You will still need to spend time training and maybe write an
occasional spamassassin rule, but that is just the nature of the game
anymore. Spam changes constantly, and you have to change with it.


+1 on MailScanner. Easy to install and configure, self-updating. I
also use Rules du Jour to update spamassassin.


--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

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Old 06-05-2008, 12:03 AM
Michael Nelson
 
Default sendmail and spam

Craig White wrote:

Those things alone and greylisting knock down most of it so spamassassin
has a much lighter load and MailScanner is awesome.


Since I set up milter-greylist we went from 90% spam daily to < 10%, and
that part is easily handled by spamassassin. Load on the mail server is
way lower too.


--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

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Old 06-05-2008, 05:23 AM
Les Mikesell
 
Default sendmail and spam

Alain Terriault wrote:
>
> What is todays most effective combination to filter spam ?
>
> On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
> good, but with the current setup we are getting way to much spam.
>
> Looking around I found new players, well some I did not know then and
> they are very interesting..
>
> MailScanner .. http://www.mailscanner.info/
> Sagator .. http://www.salstar.sk/sagator/
> Smf .. http://smfs.sourceforge.net/index.html
> dspam .. http://dspam.nuclearelephant.com/index.shtml
>
> I am tempted to go with smfs because it is familiar .. but, mailscanner
> seems popular

Another good choice is MimeDefang (http://www.mimedefang.org/).
There are rpms of it and clamav in the rpmforge repo.

--
Les Mikesell
lesmikesell@gmail.com
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Old 06-05-2008, 06:52 AM
Michel van Deventer
 
Default sendmail and spam

Hi,

On Thu, 2008-06-05 at 00:23 -0500, Les Mikesell wrote:
> Alain Terriault wrote:
> >
> > What is todays most effective combination to filter spam ?
> >
> > On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
> > good, but with the current setup we are getting way to much spam.
> >
> > Looking around I found new players, well some I did not know then and
> > they are very interesting..
> >
> > MailScanner .. http://www.mailscanner.info/
> > Sagator .. http://www.salstar.sk/sagator/
> > Smf .. http://smfs.sourceforge.net/index.html
> > dspam .. http://dspam.nuclearelephant.com/index.shtml
> >
> > I am tempted to go with smfs because it is familiar .. but, mailscanner
> > seems popular
>
> Another good choice is MimeDefang (http://www.mimedefang.org/).
> There are rpms of it and clamav in the rpmforge repo.
>
I use a combination of Postfix with rbl, spamassassin, clamav and
amavisd. It filters about 95-98% of my spam. I also have a spamcop
account to report the spam that gets through.

Regards,

Michel


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