Free Email Blacklist Checker
Free Email Blacklist Checker25 free checks per IP per day. Queries 9 public DNSBLs (Spamhaus, SpamCop, Barracuda, SORBS, and more). No data is stored.
Check whether your domain or sending IP is on a known email blacklist. Tests against 9 major DNS blocklists (Spamhaus, SpamCop, Barracuda, and more) in seconds, with plain-English results.
Check if you are blacklisted
To check whether your domain or IP is blacklisted, enter it above: this free tool queries 9 major DNS blocklists (Spamhaus, SpamCop, Barracuda, and more) in parallel and reports which ones flag you. A listing means much of your mail is rejected before anyone reads it. The leading cause is bounces from unverified lists.
Clean today. Stay clean tomorrow.
Bounces from dead addresses are the #1 reason domains get blacklisted. Cleanlist verifies your list across 25+ providers before you send, so you never bounce into a blocklisting. 250 credits and three seats free for 14 days, no card.
- 25+providers in one waterfall lookup, priced as one result
- 98%verified work email on a 500-lead stratified test
- 85%direct dial on that same 500-lead test
- 0credits to search. Free and unlimited on every plan
You checked your domain. Upload the list you send to and verify every address on it. 250 credits, 3 seats, 14 days. No card required.
How Does This Tool Work?
An email blacklist checker tells you whether your sending domain or IP address has been flagged by the blocklists that mailbox providers consult before deciding where to put your mail. Enter a domain, email, or IP, and the tool checks it against 9 widely-used public DNSBLs (Spamhaus ZEN, SpamCop, Barracuda, SORBS, CBL/abuseat, PSBL, UCEPROTECT, and others) in parallel, then reports exactly which lists flag you and which come back clean.
Why being blacklisted matters for outbound: when you appear on a major blocklist, a large share of your cold emails get rejected or filtered to spam before anyone reads them, regardless of how good your copy or targeting is. Most senders don't find out until reply rates quietly collapse. A 10-second check tells you whether a blacklist is the hidden reason your campaigns stopped working.
How domains end up on blacklists: the number one cause for outbound teams is bounces. When you send to invalid or outdated addresses, those bounces and any spam-trap hits get reported, and blocklists flag your domain or IP. Other causes include sudden volume spikes, missing authentication (SPF/DKIM/DMARC), and shared IPs poisoned by other senders.
The pattern is almost always the same: a dirty list produces bounces, bounces produce a blacklisting, and a blacklisting kills deliverability.
That is the connection to keeping a clean list. The fastest way to stay off blocklists is to never send to addresses that will bounce in the first place. Cleanlist verifies every address on your list across 25+ providers at 98% accuracy before you send, catching the dead and risky addresses that would otherwise trigger a blacklisting.
Run this checker to see where you stand today; verify your list to stay clean tomorrow. While you're auditing your setup, the MX lookup tool confirms your mail and SPF records are configured correctly. Privacy note: this tool queries public DNS blocklists only. It does not send email or store the values you check.
Who Uses the Free Email Blacklist Checker?
Teams across go-to-market rely on clean, verified data. Here is where this tool fits.
Outbound teams
Diagnose why a cold campaign's reply rate suddenly collapsed.
Email ops
Audit sending-domain health before scaling volume.
Founders
Check your domain before founder-led outbound burns it.
Agencies
Verify client sending domains aren't already flagged.
What Can the Full Platform Do in 5 Minutes?
This free tool is the tip of Cleanlist. Watch a real ICP search go from query to enriched, validated, CRM-ready list in under five minutes. 36 leads, 100% contact fill, synced to HubSpot.
36 ICP leads, 100% contact fill, validated and pushed to HubSpot in one flow
Get contact data where you already prospect
The Cleanlist Chrome extension pulls verified emails and direct-dial phone numbers off LinkedIn profiles and search results without leaving the tab. Every new workspace starts on Scale for 14 days (250 credits, 3 seats, no card), and the extension stays available afterwards on the $0 Free plan at 30 credits a month.
Which Cleanlist Plan Do You Need?
Annual billing takes 25% off every paid plan. Search is free and unlimited on all four: a verified work email is 1 credit however many providers it took, a direct dial 10, both together 11, validation 0.5, AI qualification 5. A miss costs nothing, and the credits sit in one shared team wallet.
Frequently Asked Questions
How does the email blacklist checker work?
Enter a domain, email, or IP address. The tool resolves it to a sending IP and queries 9 major public DNS blocklists (Spamhaus ZEN, SpamCop, Barracuda, SORBS, CBL, PSBL, UCEPROTECT, and more) at once using the standard DNSBL reverse-lookup method. Within a few seconds you see which lists flag the address and which report it clean, plus what the result means for your deliverability.
Why is my domain on an email blacklist?
The most common reason for outbound teams is bounces. Sending to invalid or outdated addresses, or hitting spam traps, gets your domain or IP reported to blocklists. Other causes include sudden sending-volume spikes, missing SPF/DKIM/DMARC authentication, and shared IPs ruined by other senders. Because bounces are the leading cause, verifying your list before you send is the single best way to avoid getting listed.
How do I get off an email blacklist?
First, stop the behavior that got you listed, which usually means cleaning your list so you stop bouncing. Then visit each blocklist's removal page and request delisting (Spamhaus, SpamCop, and Barracuda all have self-service forms). Removal sticks only if you've fixed the root cause. Cleanlist verifies your list across 25+ providers so you stop generating the bounces that get you re-listed.
Does a clean blacklist result mean my emails will reach the inbox?
It's necessary but not sufficient. Not being blacklisted clears one hurdle, but inbox placement also depends on your bounce rate, sender authentication, content, and engagement. The highest-leverage move is keeping your list clean so you never bounce into a blacklisting in the first place. Pair this checker with list verification and inbox-safe copy (test it with the free email spam checker) for full coverage.
Which Free Email Lookup Tools Work Together?
Free, purpose-built tools that work together. Start from a name, a domain, an email, or a block of text, and move to a verified contact.
- Email VerifierVerify addresses (single or bulk CSV) so bounces never wreck your sender reputation.
- MX LookupConfirm your mail servers and SPF records are configured correctly.
- Cold Email Spam CheckerScore your cold email copy and fix the triggers that route you to spam.
- Domain ValidatorConfirm a domain resolves and has valid MX records to receive mail.
Which Tool Should You Buy for This at Scale?
Independent comparisons of the platforms that do this job on a whole database, including where Cleanlist fits and where it does not.
Gain full access for 14 days.
250 credits, 3 seats, no card needed. Access to every feature except public API & MCP.
Cleanlist finds, verifies and enriches contact data, and syncs it two ways with HubSpot, Salesforce and Pipedrive, or one way out to Outreach, Salesloft and Lemlist. Cleanlist does not send email.