Quote:
Originally Posted by n5bb
If the problem is only when sending from your own domain through Fastmail outgoing servers, I would check that your DKIM and SPF setup is correct and if you are using DMARC try loosening up your policy.
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It was the first thing I checked - DKIM and SPF were fine. The Fastmail support rep said "DNS looked fine." I wasn't using DMARC.