E-Mails with mixed languages in Spam detector

Sep 7, 2023
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Good morning,

I would like to remove some of the languages to prevent spam from China, Japan, ....
But what would happen if somebody sends me a mixed mail? English body, but the signature in a language that is "not allowed"? Or if somebody quotes in a language that is not allowed? Is this message then flagges as spam?

Thanks
Johannes