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You can run SpamAssassin from the command line to figure out if it is using Pyzor. The process is described at RazorHowToTell, but the summary is to run the following from the command line:

  spamassassin -D < /usr/share/doc/spamc/sample-spam.txt

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--lint

Pyzor on Debian

• If you are using Debian, there are (currently) packages for testing and unstable available from the main tree:

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