On Fri, 7 Oct 2011, Paolo Carlini wrote:
> Sorry if I'm saying something totally obvious - I'm quite naive in this
> area - but do spam filters based on the language of the text already
> exist?

Yes, SpamAssassin has a filter which tries to implement that:  For
my primary mailbox, I have

  ok_languages            en de

in .spamassassin/user_prefs and then filter (or score) on

  ^X-Spam-Status: .*UNWANTED_LANGUAGE

Gerald

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