Spam Control - Matt Zuehlke and Nick Zeller
SpamAssassin
Installation
Used to install and do basic configuration for test purposes
http://www.brennan.id.au/12-Sendmail_Server.html#spam
Config
After installation config generator used to setup. http://www.yrex.com/spam/spamconfig.php
Spam and Ham Training
Training spamassassin bayesian filter for spam and ham rules. http://spamassassin.apache.org/full/3.0.x/dist/doc/sa-learn.html
Rulesets
After install, config and training we installed the applicable rulesets to our installation to catch more spam.
http://wiki.apache.org/spamassassin/CustomRulesets
Firewall
Ports requested by Zimbra and Snort
We used SELinux with IPtables 4.0 as our firewall and setup iptables opening the ports below in the attachment are needed by default for Zimbra and Snort. For a Guide on how to write IPtables go here http://wiki.centos.org/HowTos/Network/IPTables
Next on list to do
Next we would like to setup some dummy mx records that lead to no where, that way spam emailers will give up after first try of not being able to connect.
As seen here http://wiki.apache.org/spamassassin/OtherTricks and here http://blog.eukhost.com/webhosting/change-in-mx-record%E2%80%A6/