It may be a red herring, but I just received a notice from my ISP:
Quote:
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Starting in February 2024, Google and Yahoo will be requiring that all email senders which send over 5,000 messages a day must have a DMARC policy and ensure all email is properly aligned with DKIM and SPF. After this date, non-compliant messages will be significantly more likely to be considered spam and may be discarded. We are signing all outbound email with DKIM and have a DMARC policy in place so messages sent through our services should be unaffected and delivered as expected
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