The 550 5.7.0 bounce means the email was rejected by a security or spam policy. Learn what triggers this and how to fix it.
5.7.0
| Component | Value | Meaning |
|---|---|---|
| Class | 5 | Permanent failure |
| Subject | 7 | Security or policy |
| Detail | 0 | Message Rejected (Policy) |
Per RFC 3463 Enhanced Mail System Status Codes. Class (X) = severity, Subject (Y) = category, Detail (Z) = specific condition.
Your email was rejected by a policy filter. This broad rejection can cover spam filtering, content policies, IP reputation blocks, or a sending rate issue.
These are real bounce message formats you might receive. Paste yours into the Bounce Decoder for instant analysis.
550 5.7.0 Our system has detected that this message is likely unsolicited mail 550 5.7.0 Message rejected due to policy
Fixing this type of bounce requires correctly configured SPF, DKIM, and DMARC records. Our free Domain Checker analyses all three in one scan and tells you exactly what to fix.
Run a Free Domain Authentication Check →Paste your full NDR email, SMTP error line, or mail log fragment to get an instant plain-English diagnosis.
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