Block Chinese Spam

## Charsets from asia:

/^Content-type:.*charset\s*=[\s\"]*(big5|euc-kr|gb2312|ks_c_5601-1987|ISO-2022-JP)/ REJECT
/^Subject:.*\[Big5\].*/ REJECT
/^Subject: \=\?iso-8859-1.*/    REJECT

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