detect an email with japanese characters

Konstantin <[email protected]>
Newsgroups gmane.mail.procmail
Message-ID <[email protected]> 
Hi,

How it is possible to detect (and filter) an email written in Japanese characters (which I cannot read anyway)?

The content-Type specifies charset="utf-8". The "From" field is apparently invalid, and may not necessarily contain .jp

Regards,
Konstantin.
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