I think it is not up to "SPF and DKIM configured". I believe is because of you have some "bad" keyword invoice, money, etc. in the body of the email causing thi

I think it is not up to "SPF and DKIM configured". I believe is because of you have some "bad" keyword invoice, money, etc. in the body of the email causing this. I assume that is the problem because when I reported to Google support about "why this Stripe email is in spam" and I provide them with email body. Then reply from Google G Suite support went to spam (since it had email body in it). And of course the fact that you use FastMail does not help.