To finish installation please follow these steps: 1. Edit /usr/local/etc/mimedefang/mimedefang-filter 2. Reconfigure sendmail to use MIMEDefang, for example add this lines to your sendmail.mc: MAIL_FILTER(`mimedefang', `S=local:/var/spool/MIMEDefang/mimedefang.sock, F=T, T=C:15m;S:4m;R:4m;E:10m')dnl define(`confINPUT_MAIL_FILTERS', `mimedefang')dnl rebuild sendmail.cf and install it. Also, you can install some anti-virus software to check your mail, for example: security/clamav Open source AV package with automatic virus definition updates security/f-prot F-Prot Antivirus for BSD Workstations security/vscan Evaluation version of a DOS/Windows/Linux file virus scanner