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using PHP (and some ShellScript) to protect your linux server against bruke force attacks(http://en.wikipedia.org/wiki/Brute_force_attack).
also keep a log in MySQL and have email reporting
siggen is a cool email signature generator for encrypted ansi c (confused), brainf*ck, ... signatures. Use it in combination with vi(m), emacs, mutt, pine, or what ever. (tested on Solaris, Linux and Windoze). Optimized only for geeks :-)