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550 5.7.0 Message rejected due to policy

permanent Policy

Meaning

The receiving server rejected the message because it violated a local security, spam, or content policy.

Common causes

  • The message content triggered a spam filter.
  • Your sending IP or domain is on a local blocklist.
  • The recipient's organization has strict rules blocking external emails or specific attachments.

How to fix

  1. Review your email content for spam-like characteristics (e.g., suspicious links, overly promotional language).
  2. Ensure your sending infrastructure is fully authenticated (SPF, DKIM, DMARC).
  3. If sending to a corporate domain, ask the recipient to whitelist your sending address or IP.

Example bounce

550 5.7.0 Message rejected per policy.

FAQ

What does 'policy' mean here?
Policy is a catch-all term for any rule configured by the receiving server's administrator. It usually means spam filtering, but can also mean attachment blocking or sender restrictions.
Should I keep trying to send?
No. Repeatedly hitting a policy block will further damage your reputation. Fix the underlying issue first.

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