header_checks: Block foreign SPAM

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I can read some French and German but English is my native language. I certainly cannot read Chinese, Japanese or Russian. Therefore, quite pointless receiving any.

Quote:   

#
# Not in english character set? No use to me.
# China = GB2312, big5
# Korean = euc-kr, ks_c_
# Russian = koi8-r, iso-8859-5
/^Subject:.*=\?(GB2312|big5|euc-kr|ks_c_.*|koi8.*|KOI8.*)\?/ REJECT Message header rejected [064a]
/^Content-Type:.*[:space:]charset="?(GB2312|big5|euc-kr|ks_c_5601-1987|koi8.*|KOI8.*)/ REJECT Message header rejected [064b]