> However, I’d expect those mails to be delivered anyway since I marked the address as safe each time, but here we are. Presumably if there's no SPF or DKIM, t

> However, I’d expect those mails to be delivered anyway since I marked the address as safe each time, but here we are. Presumably if there's no SPF or DKIM, then it's impossible for Gmail to verify that the mail has actually come from the address you whitelisted. It could just as easily be a phishing scam. IMO it's quite reasonable to reject such mail by default.