Free toolsDeliverability · Blocklists

Email Blacklist Checker

Enter a domain or sending IP to check it against the major DNS blocklists. A listing on Spamhaus, Barracuda, or SpamCop can silently send your cold email to spam — find out before it costs you replies.

Runs live DNS blocklist lookups from your browser — nothing is stored unless you ask us to email the results. Some lists (e.g. Spamhaus) restrict public DNS resolvers and may show as “couldn’t check”; for sender checks, enter your sending IP directly.

Stop guessing at deliverability.

Prospect AI sets up and monitors your sending infrastructure end to end, so every email lands where it should.

Request a Demo