Hi all,
I’m running into a similar problem. Have just set up a MIAB on a VPS. IP checks as clean (no blacklist), and I’ve configured SPF and DKIM records on the DNS. Only out-of-the-ordinary setup is that I’m using mail.[domainname].com instead of box.[miab].com for records, but I’ve made sure the DNS records are reflecting that. I’ve used mail-tester.com to test and it comes up squeaky clean, but I’m still having issues of having mail going to the SPAM folder for GMail users.
Anything else I can check on?
TIA.