I'm not convinced about this generalization. Case in point is the mail relay server of our company which definitely counts as a small indie server and whose ema

I'm not convinced about this generalization. Case in point is the mail relay server of our company which definitely counts as a small indie server and whose email is accepted and not marked as spam. Of course we have configured SPF, DKIM and a proper reverse dns lookup on both ipv4 and IPv6, but that’s just being a good email-citizen anyways.