Spam traps
Old or bought lists contain addresses that exist only to catch senders who never cleaned their list.
Tools · 25 blacklists
Email blacklist check
Is your domain or sending IP on a spam blacklist? Check 25 public blacklists live, with a removal link for every listing.
Runs in your browser · public DNS only · every list self-tested first · nothing stored
Result for
listings
What we checked
For a domain we check the domain itself, sending IPs written in its SPF record, its mail server and its website server. Shared servers run by Google or Microsoft are skipped: their reputation is managed by them. To check the exact IP your email leaves from, find it in an email header (the first Received line) and enter it.
Listings
Every blacklist checked
"Unavailable now" means the list did not answer its own test entry, so we do not report it as clean.
Check these on their own sites
What an email blacklist is
A blacklist (DNSBL) is a public list of IP addresses or domains seen sending spam. Mail servers look up every incoming email against the lists they trust; a listing can send your email to spam or get it rejected.
IP lists matter when you send from your own servers or a dedicated IP. If you send through Google Workspace or Microsoft 365, the sending IPs are shared and managed by them, so your domain reputation matters more than any IP.
If you are listed
- StopPause cold sending from the listed domain or IP. Sending more makes it worse.
- Find the causeA hacked form or mailbox, a bought list with spam traps, high bounces or complaints. Fix it first.
- Request removalUse the link next to each listing. Many lists, such as SpamCop, also expire entries on their own.
- PreventAuthenticate with SPF, DKIM and DMARC, verify lists before sending, keep complaints below 0.3 percent.
What we can and cannot check from your browser
| Blacklists | Checked here | Why |
|---|---|---|
22 IP lists, including Barracuda, SpamCop, Mailspike, PSBL, UCEPROTECT and DroneBL | Yes, live | They answer lookups through public DNS. Each is self-tested before every check. |
NordSpam, SuomiSpam, Scientific Spam domain lists | Yes, live | Domain lists that answer public DNS lookups. |
Spamhaus ZEN and DBL | Link to their site | Refuses public DNS lookups and returns a "refused" code that other free checkers misread as clean. |
URIBL and SURBL | Link to their site | Refuse public DNS lookups. |
SORBS | No | Shut down in 2024. |
Why domains get blacklisted
High bounce rate
Many invalid addresses in one send look like a spammer guessing.
Complaints
People clicking "report spam". Keep it below 0.3 percent, Google’s limit.
Compromised account
A hacked mailbox or website form sending spam in your name.
Sudden volume
A new domain jumping from zero to hundreds of emails a day without warm-up.
Gmail and Yahoo sender rules
What inbox providers require since February 2024
Bulk senders send about 5,000 or more emails a day to Gmail. Cold email teams reach that quickly across mailboxes, so treat the bulk rules as the standard.
Source: Google email sender guidelines
| Rule | Who | Requirement |
|---|---|---|
| SPF or DKIM | All senders | Required |
| SPF and DKIM | Bulk senders | Required |
| DMARC, p=none or stronger | Bulk senders | Required |
| From domain aligned with SPF or DKIM | Bulk senders | Required |
| One-click unsubscribe | Bulk senders, marketing email | Required |
| Spam complaint rate | All senders | Below 0.3 percent |
Questions people ask
How do I check if my domain is blacklisted?
Enter the domain above. We check it against the public domain blacklists and check the sending IPs in its SPF record, its mail server and its website server against 22 IP blacklists. For Spamhaus, URIBL and SURBL use the links in the result: they only answer on their own sites.
Why is Spamhaus not checked here?
Spamhaus refuses lookups that come through public DNS services such as Cloudflare and Google, which is how a browser-only tool works. Other free checkers that query it this way often show "not listed" when the answer was actually "refused". We link to Spamhaus’s own checker instead.
What does "unavailable now" mean?
Before every check we query each list’s official test entry, which should always show as listed. If a list does not answer it correctly, we show it as unavailable instead of reporting your domain as clean.
I use Google Workspace. Do IP blacklists matter?
Rarely. Google’s sending servers are shared and managed by Google, so we skip them. What matters for you is your domain reputation: check Google Postmaster Tools and keep SPF, DKIM and DMARC in place.
How long does removal take?
From hours to a few days. SpamCop entries expire about 24 hours after the last report. Others need a removal request, and some only remove after the problem stops.
Is my domain stored?
No. The check runs in your browser through public DNS. RevOps Lab does not receive or store the domain, the IPs or the result.