Checking domain blacklists

If your domain is listed on a spam or blacklist database, your reputation and email deliverability suffer. These services show whether your domain or sending IP is listed.

Check many lists at once

• MXToolbox Blacklist CheckChecks a domain or IP against known spam and blacklist databases.
• DNSBL.infoChecks whether your domain or IP appears on DNSBL lists.

Individual blocklists

• Spamhaus Blocklist CheckRuns several DNS-based blocklists. Check whether your domain or IP is listed.
• Barracuda Reputation Block ListChecks an IP against Barracuda's reputation list.
• SpamCop Blocking ListLooks up an IP on the SpamCop blocklist.
• PSBL (Passive Spam Block List)Looks up an IP on the Passive Spam Block List.
• InvaluementChecks whether an IP or domain is on Invaluement's lists.
• CBL (Composite Blocking List)Looks up an IP on the Composite Blocking List.
• SORBSBlacklist checks for domains and IPs.
• SURBLChecks whether your domain is listed on SURBL.

Reputation scores

• SenderScoreScores your sending IP so you can tell if it might be flagged as a spam source.
• Talos IntelligenceReputation check for IPs and domains.

Some of these services change their addresses or merge over time (CBL now sits under Spamhaus, and SORBS has had ownership changes). If a link redirects, follow it. It will land on the current lookup page.