Have you been getting the "554 5.7.5 permanent error evaluating DMARC policy" while sending emails from your domain? The "5.7.5 permanent error evaluating DMARC policy" is a common error that stops the SMTP ports from accepting emails from your domain.
Discover how the 2025 changes to NCSC Mail Check will impact UK public sector organizations and learn strategies for maintaining robust protection against phishing and spoofing.
A DMARC policy allows domain owners to specify how email receivers should handle emails that fail authentication checks (SPF and DKIM) - none, quarantine or reject.
The “550 SPF check failed” message is common error prompt that maybe triggered by an absent or invalid SPF record in the sender’s DNS, or third-party spam filters.
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