Blacklist Checker

The Blacklist Check tool tells you whether your domain or mail server IP is listed on email blacklists (DNSBLs) — the spam databases that mail providers use to decide what to accept. A listing can quietly send your emails to spam or bounce them entirely, so checking is essential for deliverability. Enter a domain or IP and scan dozens of blacklists at once. Free, with no signup.

Find Out Why Your Email Isn't Arriving

When emails mysteriously bounce or land in spam, a blacklist is a prime suspect. Mail providers consult DNS-based blacklists — lists of IPs and domains flagged for spam — before accepting a message, so a single listing can wreck your deliverability. This tool checks your address against many blacklists in one pass, turning an invisible reputation problem into a clear, actionable report.

How to Use It

1. Enter your domain or IP.
2. Run the check across dozens of blacklists.
3. Review and act — fix the cause, then request delisting.

How You End Up Blacklisted

A listing usually traces to one of these causes:

• Compromised server or account sending spam without your knowledge.
• Misconfigured mail server acting as an open relay.
• Shared IP tarnished by a spammer who uses the same address.
• Spam complaints spiking from recipients.
• Malware on a connected machine generating junk mail.

Sometimes the cause is a neighbor on shared hosting — but the listing affects you all the same until it's resolved.

Not All Blacklists Are Equal

An honest point that saves you needless panic: the blacklists vary enormously in importance. Appearing on a major, widely-consulted blacklist seriously harms deliverability, while a listing on a small or obscure one may have little real effect. When you see results, focus on the reputable lists that major mail providers actually use, and don't lose sleep over an unknown blacklist nobody references.

How to Get Delisted

Removal is a two-step process, and the order matters. First, fix the root cause — secure the server, stop the spam source, or correct the misconfiguration. Requesting removal without fixing the problem just gets you relisted, often faster than before. Then, visit each blacklist that flags you and follow its delisting process; most offer a request form, and some remove you automatically once the bad behavior stops.

Make It a Habit

Check your status periodically, and always before a large email campaign. Catching a fresh listing early lets you fix it while the damage is small, rather than discovering it after a send has already failed. For businesses that live by email, ongoing reputation monitoring is well worth it. The check works on any domain or IP, so you can vet senders and investigate partners too. Free, with no signup.

Blacklist Check FAQs

What is a blacklist check?

It checks whether your domain or mail server's IP address appears on email blacklists — also called DNSBLs or RBLs — which are databases of addresses known for sending spam. If your IP is listed, mail providers may reject your emails or route them to spam. The tool queries dozens of these blacklists at once and reports any that list you.

Why does being blacklisted matter?

Because it cripples your email deliverability. Major mail providers consult blacklists to decide what to accept, so a listing can cause your messages to bounce or land in spam folders — disastrous for a business that relies on email. Checking your status, especially before a big send, lets you catch and fix a problem before it costs you delivered mail.

How does an IP or domain end up on a blacklist?

Common causes include a compromised server or account sending spam, a misconfigured mail server acting as an open relay, sharing an IP address with a spammer, a sudden spike in spam complaints, or malware on a connected machine. Sometimes the cause is innocent — a shared hosting neighbor's behavior — but the listing still affects you until resolved.

How do I get removed from a blacklist?

First, fix the root cause — secure the server, stop the spam source, or correct the misconfiguration — because requesting removal without fixing the problem just gets you relisted. Then visit each blacklist that lists you and follow its delisting process; most have a request form. Some delist automatically over time once the bad behavior stops, while others require a manual request.

Are all blacklists equally important?

No. Being on a major, widely-used blacklist like the well-known ones has a serious impact on deliverability, while a listing on a small or obscure blacklist may have little practical effect. Focus your attention on the reputable blacklists that major mail providers actually consult. The tool helps you see which lists flag you so you can prioritize.

How often should I check my blacklist status?

Periodically, and especially before sending a large email campaign. Regular checks catch a fresh listing early — before it quietly tanks your deliverability — so you can address it while the damage is small. Businesses that depend on email often monitor their sending IP's reputation continuously.

Can I check a domain I don't own?

Yes, blacklist status is public, so you can check any domain or IP. This is useful for vetting a sender, investigating why mail from a partner isn't arriving, or assessing the reputation of a server before relying on it. The check simply reports what the public blacklists say.

Is the tool free?

Yes, it's free with no signup. Enter any domain or IP to check it against multiple email blacklists instantly.