Bounce Codes
554 5.7.1 Permanent Failure Transaction failed (blocked by policy/reputation)
A permanent, server-wide rejection tied to the sending IP or domain's reputation — often the result of being on a blocklist.
Common causes
- Sending IP or domain appears on a major blocklist.
- Sender has been previously flagged for abuse by the receiving provider.
What to do
Check your IP and domain against major blocklist lookup tools. This code indicates a sender-side reputation problem requiring remediation, not a list-hygiene issue with the specific recipient.
FAQ
How do I get delisted after this?
Each blocklist operator has its own delisting process — identify which list is blocking you (bounce message text often names it), fix the underlying cause, then follow that operator's specific removal request process.
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