Email Blacklist Check
Check whether an email domain is on spam blacklists and has mail servers.
Looks up live data What you enter is sent to our server to fetch live results from public sources. Results are cached briefly. A Cloudflare Turnstile bot check runs when you press the button (it loads a script from challenges.cloudflare.com and may show a short challenge).
A Cloudflare Turnstile bot check runs when you press the button (it loads a script from challenges.cloudflare.com and may show a short challenge).
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About this tool
Check whether an email domain has a bad reputation. The tool looks the domain up on the NordSpam and URIBL domain blocklists, and also confirms that the domain publishes MX records so it can receive mail. Enter an email address or just the domain. This checks the domain, not an individual mailbox, and it does not send any email. Lists that cannot be queried are reported as unavailable, never as clean. Spamhaus DBL is not queried because it refuses public resolvers.
How to use it
- Enter an email address or a domain name.
- Press Check.
- See whether the domain is listed and which mail servers (MX) it uses.
Domain blacklists vs IP blacklists
There are two kinds of spam blacklist. IP blacklists list the address a mail server sends from. Domain blocklists such as URIBL and NordSpam list domain names that appear in spam, usually in links inside the message. A receiver can reject or filter a message because of either one.
If your mail is bouncing or landing in spam, check both: look up your domain here, then run your sending server's IP through the IP Blacklist Check. The sending IP appears in the Received headers when you view the original of a message you sent to another account.
Why a domain gets listed
- Links in spam
- Your domain appeared in spam messages, often because a hacked page or an open redirect on your site is used in spam links.
- A compromised website
- Injected pages or redirects on the site promote spam, scams or phishing.
- Bulk mail to bad lists
- Newsletters sent to bought, scraped or old lists hit spam traps and collect complaints.
- The domain's history
- A domain that expired and was registered again can carry the reputation of its previous owner.
How to get your domain delisted
- Find out why: look for injected pages, unknown redirects and open redirect URLs on your site, and review every service that sends mail for your domain.
- Fix the cause and secure whatever was abused.
- Look the domain up on the list's own website (uribl.com, nordspam.com) and follow its removal process.
- Publish SPF, DKIM and DMARC records so others cannot easily send mail pretending to be your domain.
- Check again here once the list has processed your request.
Common problems
- No MX records
- The domain cannot receive email as configured. Add MX records at your DNS provider.
- Domain is listed
- Investigate whether your domain was used in spam or has been compromised, then follow the list operator's delisting process.
Frequently asked questions
Does this verify that a mailbox exists?
No. It checks domain reputation and MX records only.
My mail goes to spam but the domain is not listed. Why?
Blacklists are only one signal. Missing SPF, DKIM or DMARC records, a listed sending IP, low engagement and spam-like content all affect filtering. Check your sending IP and your authentication records too.
Does this show whether Gmail or Outlook is blocking me?
No. Large mailbox providers use their own private reputation data. Google Postmaster Tools (for your domain) and Microsoft SNDS (for your sending IPs) show how they see you.