Re: Milters or SpamAssassin plugings

2008-04-11 Thread Matthew Seaman

Robert Davison wrote:

I'm running the base Sendmail with Mailscanner and SpamAssassin from
the ports.

A simple question

I'm installing SPF to help the fight against spam.

Which is the most efficient way of doing it.Sendmail milter or
the p5-Mail SpamAssassin plug-in. They both do the same, but is one a
better way than the other ?


Ah -- actually there is a crucial difference in the way SpamAssassin
and milter-spf work.  SpamAssassin uses the SPF status of a message
to add to the spam score it calculates -- typically, a message which
passes all the SPF checks has an approximately zero result on Spam
scoring, as will a message where there is no SPF stuff available at all;
but one which fails the SPF tests will get about 3 spam points. (Which
means that even a message failing SPF checks can be passed as ham)

milter-spf however operates in a binary fashion -- anything that fails
is rejected, anything that passes is accepted.

In general I prefer the SpamAssassin behaviour -- not all the world has
immediately accepted SPF as a good tool against spam; there are any number
of edge cases where a legitimate message can contradict what the SPF
settings say (mail forwarding is a particular problem) and one of the
groups that has adopted SPF most wholeheartedly are in fact, the Spammers
themselves.

SpamAssassin processing is however much heavier on system resources than
milter-spf.

Cheers,

Matthew

--
Dr Matthew J Seaman MA, D.Phil.   7 Priory Courtyard
 Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
 Kent, CT11 9PW



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Re: Milters or SpamAssassin plugings

2008-04-11 Thread Derek Ragona

At 05:04 PM 4/11/2008, Robert Davison wrote:

Thanks, but that was not exactly what I was asking.

I know I can configure it in MailScanner, but - which is the best way of 
doing it. Through Sendmail as a milter or the p5-mail-SPF plugin ??


Derek Ragona <[EMAIL PROTECTED]> wrote:   At 04:10 PM 
4/11/2008, Robert Davison wrote:
 I'm running the base Sendmail with Mailscanner and SpamAssassin from the 
ports.


 A simple question

 I'm installing SPF to help the fight against spam.

 Which is the most efficient way of doing it.Sendmail milter or the 
p5-Mail SpamAssassin plug-in. They both do the same, but is one a better 
way than the other ?



 If you have Mailscanner and spamassasin installed you just need to 
configure mailscanner.  Check the setting in MailScanner.conf located in:

 /usr/local/etc/MailScanner

 -Derek


Sendmail has milter built-in to it for some time.  All the mail scanning 
tools need milter.


The easy way to configure these tools is to configure MailScanner.  It sits 
at the top of the tree so to speak, depending on whatever AV you configure 
it to use, and MailScanner uses spamassasin and many perl libraries.


You can see all the dependencies if you do:
make depends
on the mailscanner port.

You will need to configure your AV to get updates.  Also you may want 
to  setup some of the rules files for mailscanner for whitelisting, 
blacklisting, and phishing.


One last note, don't bounce spam.  If you choose to bounce spam, as most 
has wrong return addresses you can start your own mail storm of rejected 
bounces.  A mail storm like that will easily bring down an email server.


-Derek

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

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Re: Milters or SpamAssassin plugings

2008-04-11 Thread Robert Davison
Thanks, but that was not exactly what I was asking.

I know I can configure it in MailScanner, but - which is the best way of doing 
it. Through Sendmail as a milter or the p5-mail-SPF plugin ??

Derek Ragona <[EMAIL PROTECTED]> wrote:   At 04:10 PM 4/11/2008, Robert Davison 
wrote:
 I'm running the base Sendmail with Mailscanner and SpamAssassin from the ports.

 A simple question

 I'm installing SPF to help the fight against spam.

 Which is the most efficient way of doing it.Sendmail milter or the p5-Mail 
SpamAssassin plug-in. They both do the same, but is one a better way than the 
other ?


 If you have Mailscanner and spamassasin installed you just need to configure 
mailscanner.  Check the setting in MailScanner.conf located in:
 /usr/local/etc/MailScanner

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

   
-
 Yahoo! for Good helps you make a difference
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Re: Milters or SpamAssassin plugings

2008-04-11 Thread Derek Ragona

At 04:10 PM 4/11/2008, Robert Davison wrote:
I'm running the base Sendmail with Mailscanner and SpamAssassin from the 
ports.


A simple question

I'm installing SPF to help the fight against spam.

Which is the most efficient way of doing it.Sendmail milter or the 
p5-Mail SpamAssassin plug-in. They both do the same, but is one a better 
way than the other ?





If you have Mailscanner and spamassasin installed you just need to 
configure mailscanner.  Check the setting in MailScanner.conf located in:

/usr/local/etc/MailScanner

-Derek

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

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Milters or SpamAssassin plugings

2008-04-11 Thread Robert Davison
I'm running the base Sendmail with Mailscanner and SpamAssassin from the ports.

A simple question

I'm installing SPF to help the fight against spam.

Which is the most efficient way of doing it.Sendmail milter or the p5-Mail 
SpamAssassin plug-in. They both do the same, but is one a better way than the 
other ?

   
-
 Yahoo! for Good helps you make a difference
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