Free Email Blacklist Checker
domain, email or IPblocklist status
25 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.
Keep the domain off the next blocklist
A high bounce rate from dead addresses is a common way onto a blocklist. Cleanlist AI verifies your list before you send, at half a credit per address.
The Free plan is $0 with 50 credits a month and 5 searches. Every new workspace can also try Pro free for 14 days.
- Search
- Free
- Verified work email
- 1 credit
- Phone number
- 10 credits
98% verified work emails and 85% phone numbers on our 500-lead benchmark, across 25+ providers.
A demo of Clu, the Cleanlist AI agent, doing this for a whole list. Asked: Verify every email in Series B sales leaders before Monday's send. Clu runs the tools, asks for confirmation before spending credits (Validate 480 emails on Series B sales leaders, 240 credits), fills the list row by row and reports: 480 checked: 431 verified, 33 risky, 16 invalid. Want me to drop the invalid ones before Monday?
10,000+ users, from founders to full sales teams
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G2
AppSumo
The Cleanlist AI Chrome extension finds the verified email and phone number for the LinkedIn profile you have open, in the same tab.
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.
The toolFree Email Blacklist CheckerRunsLive lookupFree quota25 / dayTakesdomain, email or IPReturnsblocklist status
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 AI 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?
The people who run it most, and what each one runs it for.
- Outbound teamsDiagnose why a cold campaign's reply rate suddenly collapsed.
- Email opsAudit sending-domain health before scaling volume.
- FoundersCheck your domain before founder-led outbound burns it.
- AgenciesVerify client sending domains aren't already flagged.
What does Cleanlist AI do with a whole list?
Watch a real search go from query to an enriched, validated, CRM-ready list: 36 leads, 100% contact fill, synced to HubSpot.
36 ICP leads, 100% contact fill, validated and pushed to HubSpot in one flow
Describe the job once. An agent runs it every week.
Clu turns one sentence into an agent. It searches 1B+ profiles, finds verified emails and phone numbers across 25+ providers, adds the people to your sequence and posts each run to Slack.
Weekly ICP outbound
Built by Clu from: “Every week, find 500 new people who match my ICP, get their emails and phones, and add them to Series B outbound.”
- Searched 1B+ profiles for new ICP matches500 foundPeople Search
- Ran the waterfall across 25+ providers487 emails · 412 phonesWaterfall
- Verified every email and phoneSMTP + catch-allVerification
- Added them to Series B outbound500 peopleSequences
- Posted the run to #pipelineSlackAgents
Friday 4:52 PM15 replies · 5 calls booked
Everything in the 14-day Pro trial
- Clu and agentsDescribe the job in one sentence. Clu builds the agent, runs it on a schedule or a CRM trigger and posts every run to Slack.
- People and Company SearchFind your buyers in 1B+ profiles from one sentence. Searching costs 0 credits.
- Waterfall enrichmentAsk 25+ providers in order and stop at the first verified email or phone number. 98% verified work emails and 85% phone numbers on a 500-lead benchmark.
- Email verificationRun SMTP and catch-all checks on every address before it reaches a sequence, at half a credit an email.
- ICP scoringScore every lead 0 to 100 against your ICP, with the reasons written down. The Research and Qualification skills do the digging.
- SequencesSend email from your reps' own inboxes, with call tasks. A reply stops the sequence. Sending costs 0 credits.
- CRM syncTwo-way sync with HubSpot, Salesforce and Pipedrive. Push finished lists to Outreach, Salesloft and Lemlist.
- Chrome extensionGet a verified email and phone number in one click on LinkedIn, Sales Navigator, Salesforce and HubSpot.
- MCP and APIRun the same search and waterfall from Claude or ChatGPT with 36 MCP tools, or from your own code with the REST API.
14 days of Pro, free: 250 credits, 3 seats, agents, Sequences and Clu in Slack. Then Free at 50 credits a month, or Starter at $49 and Pro at $89 a seat a month.
Which free email lookup tools work together?
Start from whatever you have (a name, a domain, an email or a block of text) and chain the tools until you have a verified contact.
- Email Verifieremailmailbox statusCheck the mailbox with SMTP and catch-all detection before bounces hurt your sender reputation. 2 free checks per IP every 30 days.
- MX LookupdomainMX recordsConfirm your mail servers and SPF records are configured correctly.
- Cold Email Spam CheckerThe words and formatting that route cold email to spam, and how to fix them.
- Domain ValidatordomainNS, MX, SPF, DMARCConfirm a domain resolves and has valid MX records to receive mail.
Which paid tool does this for a whole database?
We compared the platforms that do this job for a whole database, Cleanlist AI included, and say where each one falls short.
- Best data enrichment toolsThe enrichment platforms side by side: coverage, credit costs and what each one verifies.
- Best sales prospecting toolsProspecting tools ranked by how fast a rep gets from an ICP to a list they can contact.
- Best sales engagement platformsTen sales engagement platforms compared on seat price, channels, contact data and AI agents, with prices read on vendor pages.
Frequently asked questions
Short answers about the Free Email Blacklist Checker: what it checks, what it costs and where it stops.
All free toolsHow 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 AI 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 (the email spam checker page covers what to avoid) for full coverage.
Now run it on the whole list.
Upload the CSV or describe the list you want. Clu finds, verifies and qualifies every row.
14 days of Pro, free.