[Exim] deny message based on From: header

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Lähettäjä: Niall Mansfield
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Vastaanottaja: exim-users
Aihe: [Exim] deny message based on From: header
Can I deny a message based on the contents of the From: header
    a. comparing against a literal string (e.g. "staff@???")?
    b. comparing against a regex?


(I do mean the From: header, not the envelope sender.)