Easy, set a filter with only contacts get through, everything else lands on junk.
Every now and then update the contacts with key emails that might have been lost.
Working quite fine since 2000's.
It's hard to say whether you're missing out on legit emails from new senders or old senders with new addresses unless you review your spam folder regularly.
It's hard to say whether you're missing out on legit emails from new senders or old senders with new addresses unless you review your spam folder regularly.