How to get removed from CBL (Composite Blocking List)
CBL (Composite Blocking List) removals go through the operator's lookup and removal portal. Fix the cause first, then request removal for the listed address.
- 1 Look up the IP address on the operator's site and read the listing reason and return code.
- 2 Find the cause on the sending host: a compromised mailbox or script, an open relay, a missing or generic PTR record, a sudden volume spike or a stale list hitting spam traps.
- 3 Fix the cause before asking for removal. A list that relists you quickly usually takes longer to remove you the second time.
- 4 Open the removal page (https://check.spamhaus.org/), enter the listed IP address and follow the confirmation steps (often an email link).
- 5 Re-check the IP address here after the next zone update to confirm the listing is gone. Monitoring alerts you if it comes back.
CBL (Composite Blocking List) at a glance
| Operator | Spamhaus |
|---|---|
| DNS zone | cbl.abuseat.org |
| Lists | IP addresses |
| Impact on delivery | High |
| Removal | Operator lookup and removal portal |
| Removal page | check.spamhaus.org |
| IPv6 | IPv4 only |
Frequently asked questions
How do I check if I am listed on CBL (Composite Blocking List)?
Enter your sending IP in the check box on this page. We query cbl.abuseat.org by DNS and show the result with the return code and what it means.
How do I get removed from CBL (Composite Blocking List)?
CBL (Composite Blocking List) removals go through the operator's lookup and removal portal. Fix the cause first, then request removal for the listed address.