spamassassin

Spamassassin
There's a couple of ways to have spam messages filltered depending on how your Spamassassin has been configured:

• Spamassassin has been configured to add X-Spam- headers to messages:
  
  if (/^X-Spam-Flag: *YES/)
{
  to $VHOME/Maildir/.Spam
  exit
}
• Subject rewritten:
  
  if (/^X-Spam-Flag: *YES/)
{
  to $VHOME/Maildir/.Spam
  exit
}

Installation

Rules du jour
Rule_du_jour script is not at that link anymore. However, according to the SARE website (last checked June 27, 2009) the rules weren't being updated. Don't need to run rulesdujour each night until they start updating the rules again (if ever).
Download the rules du jour script that will update the SARE ruleset automatically:

Installation
Install the prerequisite Perl modules:

Download the latest version of the Razor agents:

Build and install the programs:

perl Makefile.PL
make
make test


Installation
Download the latest source:

Build and install Pyzor:

Create a directory for the Pyzor config files:

Add Pyzor to the SpamAssassin config file /etc/mail/spamassassin/local.cf:

Prerequisites
Spamassassin has a boatload of Perl modules that it uses. Some can be installed via yum:

Others are best installed from CPAN:

perl -MCPAN -e shell
install HTML::Parser
install Pod::Usage
install Parse::Syslog
install Statistics::Distributions
install MIME::Base64
install Net::DNS
install Net::SMTP
install Mail::SPF::Query
install LWP
install LWP::UserAgent
install HTTP::Date