Spam Blacklist Checker
A spam blacklist checker tests whether an IP address or domain appears on public DNS blocklists (DNSBLs) such as Spamhaus, Barracuda and SpamCop. A listed result names the list, and mail servers using it may reject your messages. Fix the cause, then request removal at that list’s own site.
For site owners and admins whose mail is bouncing or landing in spam and who need to know which blocklist is responsible.
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Last editorial update: 14 November 2026.
Live spam blacklist check
Live checkListed? Request removal at the list’s own site after fixing the cause — an open relay or a compromised mailbox is the usual origin. WebJi® mail runs on protected infrastructure with outbound spam controls.
What does a spam blacklist result mean?
A “listed” result means at least one DNS blocklist (DNSBL) holds your IP or domain, and mail servers that consult that list may reject or junk your messages. A count of zero means none of the lists queried returned an entry for the address at the time of the check.
| Result | What it tells you | Next step |
|---|---|---|
| 0 lists flagging | The address is clean on the lists queried | If mail still lands in spam, check SPF, DKIM and DMARC |
| 1 list, a minor one | One operator flagged the address; impact depends on who uses that list | Find the cause, then use that list’s removal page |
| A major list such as Spamhaus | Many large mailbox providers consult it, so bounces are likely | Stop the spam source today, then request removal |
| Several lists at once | The address is actively sending spam or was compromised | Treat it as a security incident before any delisting |
Check the right address. For outgoing mail that is the IP of the server that sends it — shown in the Received: header of a bounced message — not necessarily the IP your website resolves to. What is my IP and MX record lookup help you find it.
How does a DNSBL lookup work?
A DNSBL is published as a DNS zone: the checker reverses the IP’s four numbers, adds the list’s zone name and asks DNS whether that name exists. The method is documented in RFC 5782, the IETF description of DNS blacklists.
IP to test: 192.0.2.99
Query sent: 99.2.0.192.zen.spamhaus.org (type A)
Listed: answer in 127.0.0.0/8, e.g. 127.0.0.2, plus a TXT reason
Not listed: NXDOMAIN (name does not exist)Domain lists work the same way with a domain name in place of the reversed IP; they flag domains that appear inside spam message bodies. Because each list is one DNS zone, a useful check queries many zones at once, which is what the tool above does.
192.0.2.99 is a documentation address reserved by RFC 5737, used here only as an example.
Why does an IP or domain get blacklisted?
Almost every listing traces to mail the owner did not intend to send: a mailbox with a stolen password, a hacked contact-form or PHP script, an open relay, or a bulk campaign sent to an old, unverified list. Blocklists watch spam traps and complaint data, so the cause is usually measurable.
- Compromised mailbox: a weak or reused password lets a bot send through your authenticated account.
- Hijacked website script: an outdated plugin or form handler is used to send mail from the web server.
- Purchased or stale list: spam-trap addresses on old lists flag the sender quickly.
- Shared IP neighbour: on shared hosting many sites send through one IP, so another account’s problem can affect you.
- Dynamic IP policy lists: some lists, such as the Spamhaus PBL, list home and mobile IP ranges that should not send mail directly; this is a policy entry, not an accusation.
Changing passwords and updating site code is covered in how to stop spam emails; a cleanup service is available through website security services.
How do you get removed from a spam blacklist?
Fix the cause first, then file a removal request at the list’s own website; a request for an address that is still sending spam is usually refused or relisted. Delisting takes hours to days, and repeat offenders are delisted more slowly or not at all.
- Stop the source: reset mailbox passwords, remove the infected script, close any open relay.
- Read the listing reason on the list’s lookup page; it often names the evidence and the date.
- Request removal at that list — Spamhaus, Barracuda and most others run their own forms; some lists expire entries on their own.
- Re-run the check after 48 hours, then watch bounces for the next few weeks while reputation rebuilds.
A full walkthrough is in the email blacklist check guide. WebJi® customers can email support@webji.services; the desk answers 24/7 in Hindi and English with an average first reply under 60 minutes.
How do you keep a sending IP off blacklists?
Authenticate every message, keep the sending volume steady and separate bulk campaigns from day-to-day business mail. A clean blacklist result is only one part of deliverability; receivers also score authentication and complaint rates.
Publish SPF, DKIM and DMARC — verify them with the SPF, DKIM and DMARC checker — and make sure the sending IP has a matching PTR (reverse DNS) record. Office mail is safer on business email hosting than on a web server shared with many sites, and newsletters belong on a separate sending setup such as email marketing hosting.
Frequently asked questions
Should I check my website IP or my mail server IP?
The mail server IP, because blocklists judge the machine that hands mail to the receiver. If your mail runs on Google Workspace or a separate email host, your website’s IP has nothing to do with your mail reputation. Read the sending IP from the Received header of a bounce.
Why does my result show listed on one tool but clean on another?
Tools query different sets of lists, and listings change by the hour. Some lists also refuse queries that arrive through large public DNS resolvers and return an error code instead of a verdict. Compare which list each tool names before drawing a conclusion.
Does a blacklist listing hurt my Google search ranking?
No. Email DNSBLs affect whether mail is accepted, not how Google ranks your website. A hacked site that sends spam, however, may also carry malware or spam pages, and those can trigger browser warnings, so fix the infection fully.
Do I need to pay to be delisted?
Major lists such as Spamhaus and Barracuda handle removal requests without a fee once the cause is fixed. Be cautious of any list or third party that demands payment for faster removal; most large mail providers do not rely on such lists.
Will moving to a new IP solve a blacklisting?
Only briefly. If the compromised mailbox or script moves with you, the new IP is listed too, and domain-based lists follow the domain regardless of IP. Clean the source first; a dedicated IP helps only when the problem was a shared-server neighbour.
Last editorial update: 14 November 2026.
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