I have been seeing some issues with bayes detection from base64 strings
within attachments causing false positives.

Example:
Oct  6 09:02:14.374 [15869] dbg: bayes: token 'H4f' => 0.999971186828264
Oct  6 09:02:14.374 [15869] dbg: bayes: token 'wx2' => 0.999968644662127
Oct  6 09:02:14.374 [15869] dbg: bayes: token 'z4f' => 0.999968502147581
Oct  6 09:02:14.378 [15869] dbg: bayes: token '0vf' => 0.999966604823748

Is there a solution to prevent triggering bayes from the base64 data in an
attachment? It was my impression that attachments should not trigger bayes
data, but it seems that it is parsing it as text rather than an attachment.

This is with SpamAssassin v3.3.

Thanks

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