Definitive method to prevent mail from an address going to Spam?

Is there a definitive way to prevent mail from a specific address from ever going to Spam? Is constantly moving messages from Spam to Inbox and hoping Spamassassin hopefully figures it out the only way?

I’ve been a happy MiaB user for years now, but still struggle with email going to Spam, even after repeatedly moving it to the Inbox folder. This problem has followed me across multiple installs, so I assume it’s just part of the deal. For what it’s worth, moving items to Spam seems to train Spamassassin very quickly, so that’s nice.

You can whitelist emails in Spamassassin, see e.g. Spam control. How to manage - #7 by KiekerJan Not really an end user option though.

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Ah thanks! I wish there was a way to use Sieve rules but this is helpful!