Foreign Spam

I've been seeing a lot more foreign language spam the last few months, and have created a mail rule to nuke it all before applying any of my other couple of hundred rules.

Basically, the rule is set to delete any messages when the Content-Type header contains any of the following strings:

charset="koi8-r"
charset="gb2312"
charset="GB2312"
charset="ks_c_5601-1987"
charset=iso-2022-jp
charset="iso-2022-jp"

I don't speak any of those languages, so all messages encoded in them are spam, as far as I'm concerned. If you know of more charsets to nuke, please leave a comment.