Blacklist Check
A DNS blocklist (DNSBL) is a list of IP addresses and domains that receiving mail servers consult to reject or filter spam sources. This check queries about 40 blocklists at once and shows timeouts and refusals as such, never as clean.
When to use this: Mail is suddenly rejected or junked, or a bounce mentions Spamhaus, Barracuda, or another list. Command prefix blacklist:
About the Blacklist Check
Check an IP address or domain against about 40 DNS blocklists at once. Timeouts and refused queries are shown as such, never as “clean”.
FAQ
- I am listed. What now?
- Find and fix the cause first (compromised account, open relay, bad list hygiene), then use the list’s own removal process. Each list page explains how.
- Why does a list show “blocked” or “refused”?
- Some lists refuse queries from large public resolvers or over-quota users; that tells you nothing about your listing.