This error possibly means your message is getting rejected due to the DMARC policy.
Check the SPF, DMARC, and DKIM records and ensure everything is okay and accurate. For DMARC records, it should begin with
“v=DMARC1” followed by the policy. Check for incorrect spellings and unnecessary application of additional values or colons.
If the records are okay, verify whether the mail server is included in SPF to allow sending emails to the recipient email in question.
You can use this website to send a test email. It will possibly point out a solution in case anything goes wrong.
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