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[https://sites.google.com/site/ghidit/how-to-2/secure-a-centos-6-mail-server-with-fail2ban Secure a CentOS 6 Mail server with Fail2ban][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]