Difference between revisions of "Spamassassin"

From wiki
(Dovecot install)
(Change user running spamassassin to vmail)
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</syntaxhighlight>
 
</syntaxhighlight>
  
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edit file <code>/etc/spamassassin/local.cf</code>
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== Bayesian filter ==
  
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<syntaxhighlight lang="cfg">
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To reach a good efficiency, SpamAssassin Bayesian filter need to be trained with both spam and ham messages. You can use your actual mailbox for that but note the following points:
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bayes_path /var/lib/spamassassin/bayes_db/bayes
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* Be sure that the folders you use for training contain only spam or ham. If a folder contain a mix of them, SpamAssassin will learn wrong info and produce bad quality results
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bayes_file_mode 0770
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* To be effective you need between 1000 and 5000 messages each of both spam and ham.
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</syntaxhighlight>
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* You need to have more ham than spam to train. Otherwise, SpamAssassin might become biased toward spam.
  
 
<syntaxhighlight lang="console">
 
<syntaxhighlight lang="console">
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# mkdir /var/lib/spamassassin/bayes_db
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# su vmail -s /bin/sh -c "sa-learn --spam --progress --dir /var/maildir/<username>/Maildir/.Spam/cur/"
 +
# su vmail -s /bin/sh -c "sa-learn --spam --progress --dir /var/maildir/<username>/Maildir/cur/"
 
</syntaxhighlight>
 
</syntaxhighlight>
  
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== Training ==
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To check the status of the database, you can run
−
 
 
−
To reach a good efficiency, SpamAssassin Bayesian filter need to be trained with both spam and ham messages. You can use your actual mailbox for that but note the following points:
 
−
* Be sure that the folders you use for training contain only spam or ham. If a folder contain a mix of them, SpamAssassin will learn wrong info and produce bad quality results
 
−
* To be effective you need between 1000 and 5000 messages each of both spam and ham.
 
−
* You need to have more ham than spam to train. Otherwise, SpamAssassin might become biased toward spam.
 
  
 
<syntaxhighlight lang="console">
 
<syntaxhighlight lang="console">
−
# sa-learn --spam --showdots --dir /var/maildir/<username>/Maildir/.Spam/cur/
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# su vmail -s /bin/sh -c "sa-learn --dump magic"
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# sa-learn --ham --showdots --dir /var/maildir/<username>/Maildir/cur/
 
 
</syntaxhighlight>
 
</syntaxhighlight>
  
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<syntaxhighlight lang="console">
 
<syntaxhighlight lang="console">
 
# apt install sa-exim
 
# apt install sa-exim
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</syntaxhighlight>
 +
 +
Configuration is stored in <code>/etc/exim4/sa-exim.conf</code>.
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 +
Edit the following setting
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<syntaxhighlight lang="apache">
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SAspamcUser: vmail
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</syntaxhighlight>
 +
 +
By defauld ''sa-exim'' is disabled. Remove the following lines to enable it
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<syntaxhighlight lang="apache">
 +
#----------------------------------------------------------------------
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# Remove or comment out the following line to enable sa-exim
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SAEximRunCond: 0
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#----------------------------------------------------------------------
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</syntaxhighlight>
 +
 +
You can now restart exim to take you settings into account
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<syntaxhighlight lang="console">
 +
# service exim4 restart
 
</syntaxhighlight>
 
</syntaxhighlight>
  
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}
 
}
 
</syntaxhighlight>
 
</syntaxhighlight>
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 +
[[Category:Install]]

Revision as of 23:30, 7 March 2016


Warning Warning: This page is a work in progress and is not completed. Important informations might be missing or wrong.

Install

# apt install spamassassin

Bayesian filter

To reach a good efficiency, SpamAssassin Bayesian filter need to be trained with both spam and ham messages. You can use your actual mailbox for that but note the following points:

  • Be sure that the folders you use for training contain only spam or ham. If a folder contain a mix of them, SpamAssassin will learn wrong info and produce bad quality results
  • To be effective you need between 1000 and 5000 messages each of both spam and ham.
  • You need to have more ham than spam to train. Otherwise, SpamAssassin might become biased toward spam.
# su vmail -s /bin/sh -c "sa-learn --spam --progress --dir /var/maildir/<username>/Maildir/.Spam/cur/"
# su vmail -s /bin/sh -c "sa-learn --spam --progress --dir /var/maildir/<username>/Maildir/cur/"

To check the status of the database, you can run 

# su vmail -s /bin/sh -c "sa-learn --dump magic"

Integrate with exim

# apt install sa-exim

Configuration is stored in /etc/exim4/sa-exim.conf.

Edit the following setting 

SAspamcUser: vmail

By defauld sa-exim is disabled. Remove the following lines to enable it 

#----------------------------------------------------------------------
# Remove or comment out the following line to enable sa-exim
SAEximRunCond: 0
#----------------------------------------------------------------------

You can now restart exim to take you settings into account 

# service exim4 restart

Integrate with dovecot

# apt install dovecot-antispam

In file /etc/dovecot/conf.d/20-imap.conf, modify the option mail_plugins and add antispam to the list 

protocol imap {
  # Space separated list of plugins to load (default is global mail_plugins).
  mail_plugins = $mail_plugins antispam
}
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