Blacklist Checker
Check if a domain or IP address appears on major email blacklists and DNSBL databases.
Frequently asked questions
What is a DNSBL?
A DNSBL (DNS Blacklist, also called RBL — Realtime Blackhole List) is a database of IP addresses known for sending spam. Email servers query these lists to decide whether to accept or reject incoming mail.
I am listed — what do I do?
Each DNSBL has its own removal process. Visit the blacklist website to find their removal policy. Common steps: fix the issue causing the listing (open relay, malware, spam), then request delisting.