Gmail marking emails as spam since DNS migration

I’ve just migrated a client to Cloudflare DNS. The DNS record is identical to what it was previously. Nothing else has changed.

Except now their email is being marked as SPAM in GSuite.

This seems identical to the problem reported here, and another here.

I understand that just changing Name Servers shouldn’t make any difference. But, is this really just a coincidence - three people have all reported the same thing?

If all the DNS records are the same as before (particularly those which address mail host validation, i.e. SPF, DKIM, DMARC) it really shouldnt make any difference. Check if they are.

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