Google has postmaster tools by Gmail for email service providers 
This doesn’t give any information for my domain.
Try this: Verify your domain with a TXT record - Google Workspace Admin Help Google domain validation tells google that you agree (via ToS I believe) that you are not a domain that send spam, etc.
Like my domain, validated when I moved IP address and my email is fine (as far as gmail is concerned):
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My domain is already verified in google postmaster. I think there is nothing for me about Google Domain Validation. Now I’m trying to understand and fix DKIM Validation issue but’s as far as I see from other active topics, it’s also something not easy to fix thing for now.
I don’t know about Gmail but when I first installed MIAB I had problems with Outlook addresses. I submitted a request to the Outlook Deliverability Support team at
https://go.microsoft.com/fwlink/?LinkID=614866
and the problem was resolved. Good luck.
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