Several reasons can cause the "5.7.5 Permanent Error Evaluating DMARC Policy" error.
Incorrect DKIM record or SPF record
Wrong policy evaluation on the recipient side
Incomplete DMARC settings
Solution - Here's How To Resolve It
Ensure there are no extra characters in the records and verify there are no unnecessary applications of quotation marks/punctuation marks or missing semicolons. Correct DMARC records start with “v=DMARC1” with the policy (none, reject, quarantine) in tow.
Ensure your SPF record is not set to neutral, as a neutral record allows scamming and fraud.
Verify that your email service provider supports SPF-aligned emails.
Relax the DMARC policy temporarily by applying "p=none" to the DMARC record in your DNS.