Your DMARC record may not work if the DMARC error you generated is not published or if there is some issue with the record you added to the domain's DNS. Or, this error may be occurring if you have not added an SPF record and DKIM authentication.
First, confirm whether the DMARC record you added to the domain's DNS is published. If not,
If your DMARC record is already published, check whether the record is accurate. The DMARC record should start with
"v=DMARC1" followed by the DMARC policy of your choice. Ensure there are no extra characters or unnecessary quotation mark applications and the record content is accurate.
p=block is wrong as policy can only be either none, reject, or quarantined.
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