The database works on a human-only submission system, where if something is submitted enough, it's trusted and added to the list of messages to kill on site. It bases this on a hash of the entire message, so small deviations are enough to make a message different. As a result, submission to Razor cannot be done by forwarding Email. Mutt has a bounce function that can be used for submissions, but you should use the razor-provided client. (An exception to this rule are 'troll' Email addresses (ie firstname.lastname@example.org) that exist only to collect spam, and you can guarantee will never get a real message. If you have one of these you're encouraged to send the message to Razor.)
The best thing to do with this is plug it into SpamAssassin.
Razor comes under the Artistic License. The Windows port is commercial, with a 30 day demo, so use the Linux version. If you're running MicrosoftWindows, there's an MicrosoftOutlook plugin called CloudMark SpamNet that runs on the same database.
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