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We have been advised today to update our DMARC policy for our secondary
domain from "reject" (which is best practice) to "none". I will update
here if this seems to solve the problem.
Just to add - we have an identical problem. We started on one domain,
and then started using another domain which we added as our secondary
domain. As far as we can see we have everything (DKIM etc) set up
correctly.We frequently find that people we ...
