From SME Server
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Now in order to use the attachment filter you need to register with VirusTotal to get your personal API key. When you have this key you need to configure the system to use it.
./SMEOptimizer.pl --VTAPI=<API key>
Then there is no further need for configuration or installation as the SMEOptimizer script automatically will get and install the qpsmtpd plugin that handles capturing the rejected spam messages and also the SpamAssassin configuration file which contains the DNS blacklist configuration. All action will be logged in the /var/log/smeoptimizer.log file.