Exact response pattern
554 5.7.1 Message rejected due to policy restrictionsPermanentGenericPolicy
What it means
The message was rejected by a security or antispam policy.
Likely causes
- Reputation.
- Content.
- Authentication.
- Malware or blocklist signal.
Recommended response
- Capture the complete diagnostic.
- Check authentication and reputation.
- Do not repeatedly retry a permanent response.
Operational rule: Preserve the complete SMTP response, remote hostname, sending IP, envelope sender and timestamp. Never diagnose from the three-digit code alone.