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A comment on Just Use Email – How to Use Email for Everything. Parent comment

Re:Just Use Email – How to Use Email for Everything by habibur on Wednesday May 12, 2021 @04:59AM (#27128223)
SPF will pass if there is no SPF record in the domain. Which most probably is the case for most.

Look for DKIM. Either it's signed and pass. Or spam if DKIM is missing. You can filter a lot more this way.

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Re:Just Use Email – How to Use Email for Everything by megous on Wednesday May 12, 2021 @11:49AM (#27131702)
dkim=pass is on 5k spam messages, missing dkim is on 95% of HAM email I receive. So that's a no go and not a great signal anyway.
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