Email DNS config is a minefield. Found out that emails to Apple-owned domains (@iCloud.com, @Me.com, @mac.com) were being rejected because they did a reverse lookup and didn't find an MX record for the sending server which was on a subdomain of our main sending domain (1/3)
But we did have those required MX records. So further digging revealed that the MX records were just not being served by GoDaddy where the DNS records were hosted, because they didn't support having MX records for multiple domains. (2/3)
So then I moved the DNS records to DNSMadeEasy (which did support that), and that fixed the problem. Then of course on top of that, you have DKIM, SPF, DMARC, etc. (3/3) #email#startup
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