

fuck, half of my critical services think I am spam
that goes away after your dns gets older and your mailserver gets “reputation”… also configure your dmarc and dkim, that tends to help a lot
another reason could be that your public ip is “dirty”, check the reputation of it and maybe request a different one from your hoster





i usually rely on https://mxtoolbox.com/ for quick checks good overview about mail and dns related issues