Problems with Cyrillic spam

I'm getting spam with the Subject, Sender personal name and body all
written in Cyrillic, but, despite having "ok_locales en fr de" defined
in local.cf, no rules are fired to mark the message as being in an
unwanted language.

The body text is in two MIME parts, one UTF-8 plaintext and the other
contains HTML, also encoded as UTF-8. The sending domain name varies,
but the tld seems to be always .ru

I'm running SA 3.3.2 and would appreciate knowing how it recognises that
a message contains a language that is not listed as belonging to an OK
locale.


Martin