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[http://www.digitalocean.com/community/articles/how-to-protect-ssh-with-fail2ban-on-centos-6 How To Protect SSH with fail2ban on CentOS 6]* very current, however, specific to protecting ssh, not covering dovecot[http://wiki2.dovecot.org/HowTo/Fail2Ban Using Fail2ban with Dovecot]* somewhat outdated. documentation from dovecot site.[http://sites.google.com/site/ghidit/how-to-2/secure-a-centos-6-mail-server-with-fail2ban Secure a CentOS 6 Mail server with Fail2ban]* in theory this should be the most current and specific guide.