SpamAssasin: SPF and invalid HELO

Does anyone know if MiaB`s SpamAssasin actually check Sender Policy Framework and invalid HELO / missing rDNS on inbound Mail? If yes, is it possible to reject those already at SMTP - instead of going into the junk folder? This would help to filter out a lot of spam that still goes through without missing important valid E-Mails or filling up junk folders massively.

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