ClamSMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software. It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. The 'DATA' email body is intercepted and scanned before forwarding. It is written with the postfix mailserver in mind but can also be used as a transparent proxy to filter all traffic.
WWW: http://memberwebs.com/stef/software/clamsmtp/
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