I wrote about this topic just a few weeks ago. But here’s a more thorough solution.

Don’t forget to remove the filters for languages that just may be in your wanted emails. I get a lot, if not most, of emails in Brazilian  Portuguese. However, I notice that no pt-BR is included in the list of recognizable languages although pt-PT is included. But on reflection in a short email, I believe it it would be close to impossible to distinguish between the Brazilian or Portuguese versions of the language. So, in my case I’ll take out lang:pt-PT.

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