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Email Blacklist Checker

Q: Which blacklists does this tool check?

25 widely used IP and domain blocklists, including Spamhaus, Barracuda, SpamCop, UCEPROTECT, Mailspike, SURBL and URIBL.

Q: Why does a list show "Unknown"?

Some lists, Spamhaus and URIBL among them, don't answer queries that come through public DNS resolvers. That doesn't mean you're listed. Check those lists directly with the link shown next to them.

Q: How do I get delisted?

Fix the cause first: a compromised account or server, a bad list, a hacked signup form or missing authentication. Then use the list's own removal page. Some lists remove entries automatically after a few clean days, while others need a manual request and relist you quickly if the problem comes back.

Q: Should I check my domain or my IP?

Both. Enter a domain and we check it against domain lists, then check every IP it resolves to. Enter an IP to check only that address.

Q: How do I stay off blacklists?

Send only to people who asked for your mail and verify lists before big sends. Authenticate with SPF, DKIM and DMARC, warm up new domains and watch complaint rates. Most listings follow a sudden change, such as an old segment mailed at once or a jump in volume.

Q: How long does it take to get removed from a blacklist?

Anywhere from minutes to weeks. Lists with automatic expiry, like SpamCop, clear on their own soon after the spam reports stop. Spamhaus usually processes a removal request quickly once the cause is fixed. Network-level listings such as UCEPROTECT levels 2 and 3 depend on the whole IP range staying clean, so they can take much longer and are often outside your control.

Q: Can a blacklist listing expire on its own?

On many lists, yes, if no new spam is seen for a set period. Don't count on it, though. While you wait, mail to receivers that use the list keeps failing.

Q: Why am I listed if I never send spam?

The usual reasons are a shared IP where another sender misbehaved, a contact form that bots abused, a compromised mailbox sending without your knowledge, or old addresses on your list that have turned into spam traps. A listing on a network-level list can also come from your hosting provider's range, with nothing to do with your own mail.

Check your domain and IP against the major email blacklists in seconds. See exactly which lists flag you and how to get delisted, step by step.

✓25 blocklists
✓Domain + IP
✓Delisting steps

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How it works

Find out if you're blocked, and get unblocked

01
Enter a domain or IP
We check the domain and the IPs it resolves to.
02
Scan the blocklists
Spamhaus, Barracuda, SpamCop, SORBS and more, live.
03
See every listing
Know exactly which lists flag you and what it means.
04
Get delisted
Follow the removal link and steps for each list.

Email blacklists explained: what a listing means and how to get delisted

An email blacklist, also called a blocklist or DNSBL, is a public database of IP addresses and domains seen sending spam. Mailbox providers and spam filters query these lists in real time, and a hit can send your mail to spam or get it refused before it reaches anyone. The blacklist checker above queries 25 lists at once for your domain and every IP it resolves to.

IP blacklists vs domain blacklists

IP blacklists track the servers mail comes from. Spamhaus ZEN combines several Spamhaus lists (SBL, XBL and PBL), and Barracuda, SpamCop and Mailspike work the same way. Domain blacklists such as Spamhaus DBL, SURBL and URIBL track domains that appear in spam, either as the sender or as links in the message body. This is why a domain can be clean while its IP is listed, or the other way round. If you send through a shared IP from your email platform, an IP listing may come from another customer on the same server.

Which blacklist listings hurt deliverability most

Not every listing carries the same weight. Spamhaus is used by a large share of mail systems worldwide, so a Spamhaus listing usually means blocked mail at many receivers within hours. Barracuda matters for business recipients behind its filters. Lists like UCEPROTECT levels 2 and 3 cover whole IP ranges or networks, so a listing there often says more about your hosting provider than about you. A result of "Unknown" means that list doesn't answer public DNS queries, so the status has to be checked on the list's own site.

How to get removed from a blacklist

Removal always starts with the cause, because most lists relist within days if the problem continues. Typical causes are a compromised account or server, a purchased list full of spam traps, a sudden volume spike or a misconfigured form that bots abuse. Fix that first, then submit a request on the list's own site. Some lists expire entries on their own after a quiet period, others need a manual request. We have step-by-step delisting guides for the major lists, including Spamhaus ZEN, UCEPROTECT L3, Barracuda and SpamCop.

How to stay off email blacklists

Send only to people who asked for your mail, verify lists before large sends, keep volume steady and watch complaints. Check your domain and IP regularly, because a listing found the same day costs far less than one found after a campaign bounces.

Next step after the blacklist check

Clean result? Check how mailbox providers rate your domain with the Domain Reputation Checker. Listed and not sure where to start? Our reputation repair service finds the cause and handles delisting for you. Warmy's reputation tracker monitors your domain and IPs daily and alerts you the moment a new listing appears.

Get blacklist alerts before your campaigns bounce. Start a 7-day trial or book a demo.

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Why Warmy

Everything Deliverability
In One Platform

One platform, one subscription, one team, no add-ons, no extra vendors.

Scale & people

1M+ real mailboxes - The largest warm-up network — genuine Workspace, Microsoft 365 and consumer inboxes.
A dedicated success manager - A named expert who owns your placement outcomes, not a ticket queue.
24/7 support, VIP channels - Real people any hour, in your own Slack, WhatsApp or Teams channel.
120+ deliverability specialists - The largest team in the category, dedicated to inbox placement.
An in-house research team - Continuous experiments on how Gmail, Outlook and Yahoo filter this month.
Recognised experts - Specialists who advise on sender reputation daily — not generalists.

Technology

Adeline AI co-pilot - Reads your tests, DNS and warm-up data, then tells you what to fix next.
The infrastructure behind other tools - Outreach platforms and ESPs run their warm-up on our API.
One loop: test, warm, fix - Placement tests, warm-up, monitoring and fixes in a single platform.
500K+ US seed accounts - Real inboxes across major, corporate and regional providers — mobile included.
Monthly seed rotation - Aging mailboxes retire automatically, so your data comes from live inboxes.
Automation built in - n8n, Zapier, Make and a documented API — no CSVs, no manual seed files.

Included in every plan

Email verification - Clean lists before you send, so bounces never cost you reputation.
DMARC tracker - SPF, DKIM and DMARC monitoring with the exact record to change.
Deliverability tester - Instant placement, authentication and blacklist check for any sender.
Templates AI optimizer - Your campaign scored and rewritten for the inbox before you send.
Reputation tracker - Domain and IP reputation with blacklist alerts the moment a signal drops.
Google Postmaster built in - Postmaster data beside your warm-up and placement results.
Working-hours warm-up - Natural business-hours sending in the recipient’s time zone.
A robust API - Every feature available over documented endpoints.

No extra vendors, no add-on fees, no separate contracts.

Loved By Thousands Of Marketers Around The World

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FAQ

Blacklist
Questions, Answered

What is an email blacklist?

A blacklist (also called a blocklist or DNSBL) is a public list of IP addresses and domains seen sending spam. Mailbox providers and spam filters query these lists as mail arrives and may filter or block anything that's listed.

Which blacklists does this tool check?

Why does a list show "Unknown"?

How do I get delisted?

Should I check my domain or my IP?

How do I stay off blacklists?

How long does it take to get removed from a blacklist?

Can a blacklist listing expire on its own?

Why am I listed if I never send spam?

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Email Blacklist Checker

Find out if you're blocked, and get unblocked

Enter a domain or IP

Scan the blocklists

See every listing

Get delisted