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Note that Razor is not available for unlimited free use, so it is commented out in init.pre. It is currently free for personal use, subject to capacity constraints. See the Cloudmark SpamNet Service Policy for more details. Razor has a large number of dependencies on CPAN modules. Feel free to skip installing it, if this makes you nervous; SpamAssassin will still work well without it.
Note that Razor support does not seem to work on Windows systems. Win32 users should disable the Razor tests using "score RAZOR2_CHECK 0".
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