Email Blacklist Checker

Is my domain blacklisted?

Is my domain blacklisted? Enter it in the checker above and each blacklist answers listed or clean within seconds. To check if domain is blacklisted, type the bare domain such as example.com, without https:// or www. The email domain blacklist check uses domain-based lists such as Spamhaus DBL and URIBL, which flag the domain names that appear in your sender address and message links.

Is my email domain blacklisted?

Is my email domain blacklisted? Check the domain in your From address, because that is the domain mailbox providers evaluate. To check email domain blacklist status for a sending subdomain such as mail.example.com, enter the subdomain itself. If one campaign went missing, check if email domain is blacklisted before you rebuild the list or the template.

IP blacklist check

An IP blacklist check looks up your sending address on DNS-based lists such as Spamhaus ZEN and Barracuda. Enter an IPv4 address above to check if IP is blacklisted, or run it to check my IP blacklist standing before a large send. The tool reverses the octets and queries each list's DNS zone through Cloudflare's DNS-over-HTTPS resolver, the same lookup method mail servers use when your message arrives.

How to check if my IP is blacklisted

1. Find the sending IP. Your ESP's sending settings list it, or read the Received header of a delivered message with the email header analyzer. To check mail server blacklist status, use the public IP of the server that sends your mail, not the IP of your website host.
2. Run the lookup. For a quick blacklist IP check, paste the address above and press Check Blacklists. Whether you want to check IP blacklists one at a time or all together, the result is one list with listings first.
3. Read the severity. Critical and high listings (Spamhaus, Barracuda, SpamCop, URIBL) are the ones most likely to block delivery. Medium listings are a warning sign.
4. Fix, delist, recheck. Fix the cause, use the delist link beside the listing, then run the check again after a day to confirm it cleared.

This works as a blacklist IP address checker and a domain checker in one box, and the blacklist checker IP lookup accepts IPv4 addresses, not IPv6. Each blacklist search IP query returns its own answer, so a result can show listed on one list and clean on another. Each IP check blacklist query is a single DNS request, which is why the full run finishes in seconds. Every blacklist check IP run covers all twelve lists named above in one pass, and a blacklist lookup IP search is the fastest first step when all you have is an address from a bounce message.

Agencies that check IP for blacklist status across many clients should record each client's sending IP once and rerun the same list on a schedule. Before you warm a new address, check for IP blacklist history, because a recycled address can inherit an old listing. When bounces are vague, check IP if blacklisted first, then look at content. Before a migration, check for blacklisted IP addresses on the new ESP's pool.

You can also check IP on blacklist operators' own sites, such as the Spamhaus lookup page, but that means one site at a time; this page runs the lookups together. Many vendors now say IP blocklist instead of IP blacklist, and the two terms mean the same thing.

Domain, IP or email address: what to check

A blacklist check by IP tests the address your mail leaves from, while a check by domain tests the names in your message. Run an IP email blacklist check when every campaign is affected, and a domain check when only messages with certain links or sender names are blocked. An email IP blacklist check covers the address in the Received header of a delivered message.

Spamhaus IP lookup and Spamhaus checks

Spamhaus is the list most senders worry about, and the tool queries four of its lists: SBL, XBL, DBL and ZEN. To check IP Spamhaus status, enter the address and read the four Spamhaus rows first. To check Spamhaus status for a domain instead, read the DBL row. A Spamhaus blacklist check, also called a Spamhaus blocklist check, is a DNS lookup against zen.spamhaus.org and its sibling zones.

A Spamhaus IP lookup on the sending address shows whether it appears on SBL, XBL or ZEN. Teams often run a Spamhaus check IP query first, because Spamhaus data is used by many mail servers. The delist link beside a listing opens the Spamhaus lookup page, where you can read the reason. Run a Spamhaus IP check again after you fix the cause, and a Spamhaus lookup IP query a day later to confirm the listing cleared.

Gmail, Outlook and Yahoo blacklist checks

Gmail, Outlook and Yahoo do not publish a blacklist you can query the way you query Spamhaus. Their filters combine their own reputation systems with third-party data, so a Gmail blacklist lookup, a Yahoo blacklist lookup or an Outlook blacklist check cannot return a simple listed or clean answer from the provider itself. What you can do is check the shared lists above, since a Spamhaus or Barracuda listing is a common reason mail is blocked at all three.

Gmail check blacklist searches

A Gmail check blacklist search usually follows a rejection, so open the bounce message first and note the error text and the IP it names. If you need to check Gmail blacklist status, treat it as a reputation question: look at the Spamhaus and Barracuda rows above, then at your Gmail spam rate in Google Postmaster Tools.

Email blacklist check Microsoft: Outlook.com and Microsoft 365

For Microsoft recipients, run the IP and domain lookups above and fix any listing first. If Outlook still rejects your mail with an IP block message, Microsoft handles that through its own sender support and delisting process rather than a public list.

Barracuda blacklist check and Yahoo blacklist check

A Barracuda blacklist check queries the Barracuda Reputation Block List (b.barracudacentral.org), and the delist link opens Barracuda's removal request form. A Yahoo blacklist check works the same way: because Yahoo publishes no public list, you test the shared lists and then deal with Yahoo's own sender support if mail is still blocked.

Email blacklist check and lookup

An email blacklist check answers one question: is the IP or domain behind your email listed on a spam database? Run the email blacklist check free, with no account or card. An email blacklist lookup works over DNS, so there is no database of individual addresses to search, and an email blacklist search on the web returns articles, not status.

To check email address blacklist status, split the address into its two parts: the domain after the @ is checked as a domain, and the IP that sent the message is checked as an IP. Paste the domain part only. An email address blacklist lookup on a full address such as name@example.com is not supported, and would not return a meaningful result.

To check email blacklist status for a message that bounced, take the sending IP from the bounce header. Check for email blacklist listings after any bounce that mentions a block, a policy or a reputation problem. When you check blacklist email results, remember that clean on every list does not guarantee inbox placement. Mail administrators call this a blacklist mail check, while marketers say email blacklist check.

Run a blacklist email check on every new sending domain before launch. A blacklisted email check is also worth running the day replies or opens fall. Use a blacklist email lookup when you want a result for the domain behind an address, and a blacklist lookup tool like this one when you want both domain and IP in one pass. The form under the results sends a blacklist check email with your report and a delisting guide. Many vendors say blocklist instead: an email blocklist check, an email block list check and this email blocklist checker run the same lookups.

Spam listing lookup

A spam listing lookup asks whether an IP or domain is on a list that mail servers consult. A spam list search on the web only finds articles, so use a live lookup. A spam mail list check should be repeated, because listings change as complaints, traps and cleanups happen.

Blacklist monitoring vs a one-off check

A one-off check shows today's status only. An email blacklist monitor re-runs the lookups on a schedule and sends a blacklist alert when a status changes, and email blacklist monitoring is what catches a listing between campaigns. IP blacklist monitoring watches your sending addresses, and an IP blacklist monitor is the one to run if you send from dedicated IPs. A domain blacklist monitor does the same for sending domains.

Most senders only need mail blacklist monitoring on the IPs and domains they actually send from. Spam monitoring goes wider, adding complaint rates and inbox placement. InboxEagle's Email Deliverability includes blocklist and domain reputation tracking, alongside Google Postmaster Tools spam-rate data and seed-based inbox placement tests.

How to monitor email blacklists

1. List every sending IP and sending domain, including subdomains used by each ESP.
2. Check each one on a fixed schedule, and always before a large send.
3. Send status changes to someone who will act on them the same day.
4. Log each listing with its cause, the delisting request date and the recheck result.

Top 5 email blocklist monitoring 2026: what to require

If you compare tools, these five criteria matter more than how many lists a tool claims to check:

1. It checks both IPs and domains.
2. It runs on a schedule rather than only when you press a button.
3. It alerts you when a status changes.
4. It links each listing to the list's removal process.
5. It keeps a history so you can see how long a listing lasted.

Blacklist checklist before you request delisting

• Read the reason on the list's own lookup page.
• Stop the source: pause the segment, the campaign or the compromised account.
• Clean the list of unengaged addresses and likely spam traps.
• Confirm SPF, DKIM and DMARC pass for the sending domain.
• Submit the removal request, then recheck after 24 to 48 hours.

For the full removal process, read how to check and remove an email blacklisting.