[maildropl] deleting cyrillic alphabet spam

[Pollywog <li...@sh...>]

I don't read Russian, so I don't normally receive mail in Cyrillic.  I am 
getting lots of spam with Cyrillic characters.  Is there a way to have 
Maildrop delete such messages?  I do not see any headers that indicate 
Cyrillic characters.

Is this header something that indicates probable spam?
Content-Type: text/plain;charset="windows-1251"



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