Blocklist lookup
Is your domain blacklisted?
Paste a sending domain or mail-originating IPv4 — we fan out across Spamhaus, SenderScore, Cisco Talos, Barracuda, SORBS, Spamcop and the rest of the lists that actually move the inbox needle, then show every listing plus the upstream delist page for each.
We'll fan out across every major blocklist that affects inbox placement, show per-list verdicts, and link to each list's delist page.
Blocklists change daily and listings can appear overnight when a recipient flags traffic from your IP. Continuous monitoring catches new listings before they accumulate — see the footer below.
Pair this checker with the guide
Want the bigger picture on sender reputation?
Blocklist status is the per-message lookup that runs before any other reputation signal is even considered — a single Spamhaus listing can knock out delivery across most of the receiving internet. The full reputation guide explains how DNSBL hits compose with Postmaster domain reputation, SNDS filter colour, complaint rate, and DMARC alignment into the single composite placement Gmail and Outlook deliver. For a direct domain or IP status matrix across the configured DNSBLs, use the blacklist lookup checker as the complementary lookup path.
Read the sender reputation guide →Pair this checker with the pillar
Want the per-provider scoring behind the delist decision?
The delist workflow above is the mechanical fix for a current listing. The Email Reputation pillar walks through how the same domain scores on Gmail Postmaster Tools, Microsoft SNDS, SenderScore, and Cisco Talos — and which of those buckets keeps dragging reputation down after the listed row clears.
Read the Email Reputation pillar →