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Am I right in thinking that you have tried to set the DNS records at NameCheap (directing the MX records at Fastmail's servers) rather than parking your domain at Fastmail, and letting Fastmail do the heavy lifting of ensuring things like DMARC are set correctly?
Unless you have special reasons for keeping the DNS at NameCheap (or another DNS service) it is usually preferable to use Fastmail for the DNS. Ensuring optimal settings on the DNS records for email these days is harder than most people realise, and allowing Fastmail to do it automatically is usually the best policy.
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