Listed on Composite Blocking List (CBL)? How to get delisted
cbl.abuseat.org
What a listing means
The Composite Blocking List lists IPs of infected or hijacked machines. Its data is now part of the Spamhaus XBL.
How removal works
Clean the infection, then look the IP up and request removal through the Spamhaus checker.
Before you request removal
- Confirm the listing with ProbeKit’s blacklist check and note every list that shows the IP or domain.
- Find the cause: compromised mailbox passwords, malware on a device, an open relay or open proxy, a misbehaving web form, or sending to purchased or stale lists.
- Fix it, and make sure the IP has a proper reverse DNS (PTR) name and that SPF, DKIM and DMARC pass for your mail.
- Use the list operator’s removal process. Requesting removal before fixing the cause usually gets the IP relisted.
- Re-check after a day, and add a blacklist monitor so you hear about the next listing before your users do.
Check your IP or domain now
Type a domain, IP, email or URL and pick a check, or a prefix like Pick a check, or type a prefix like spf: · press / to search
Blacklist check · Reverse DNS · SMTP test · Guide: “550 5.7.1 … Spamhaus”