exclude emails with Japanese chars [not spam]

[W S]

Hi,
  I’m running SpamAssassin+MailScanner+Postfix on Linux and I’m receiving some 
legit emails with Japanese/Chinese characters. Unfortunately combined score is 
too high and they get marked as SPAM. Is there any easy way to tweak 
SpamAssassin in order to exclude these emails?
  TIA,
  --WS

       
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