554 5.7.1: service unavailable: client host blocked
The receiving server has blocked your sending IP address or host.
Rejected by policy or reputation
What 554 5.7.1 means
Commonly returned when your sending IP is on a blocklist (such as Spamhaus) or the receiving server blocks your network. The message text often names the list.
Common causes
- Your IP is listed on a DNS blocklist
- A shared sending IP with a bad neighbour
- A compromised account sending spam from your server
How to fix it
- Find the blocklist named in the error and look up its removal process
- Secure any compromised accounts
- Move to a clean dedicated or reputable shared IP
What to do with the address
Not an address problem. Do not remove contacts because of this error.
Check an address now with the free email checker, or look at a domain's mail setup with the email domain checker, MX lookup and SPF checker.
Related error codes
Frequently asked questions
- What does 554 5.7.1 mean?
- The receiving server has blocked your sending IP address or host. Commonly returned when your sending IP is on a blocklist (such as Spamhaus) or the receiving server blocks your network. The message text often names the list.
- Is 554 5.7.1 a hard bounce or a soft bounce?
- Rejected by policy or reputation. It is usually about the sender, not the recipient.
- What should I do with the address after 554 5.7.1?
- Not an address problem. Do not remove contacts because of this error.