Email Blacklist Checker
Check whether a domain and its sending IPs are on email blacklists like Spamhaus and SpamRats — the lists that decide whether your mail reaches the inbox. Free, instant, no signup.
Why blacklists matter for deliverability
Even with perfect SPF, DKIM and DMARC, your email won't reach the inbox if your domain or sending IP is on a blacklist. Receiving mail servers check these DNS-based blocklists (DNSBLs) before they accept a message — a listing means rejection or a one-way trip to the spam folder, often with no bounce to tell you why.
This tool resolves your domain's address and mail-server (MX) IPs, then checks each against SpamRats and — where enabled — Spamhaus DBL (domain reputation) and ZEN (IP reputation). If anything is listed, you get a direct link to that list's lookup and delisting page.
The catch: blacklist status changes daily, and you almost never notice until email quietly stops working. That's why agencies monitor it continuously. Want the full deliverability picture? Run a free domain health check or test your email deliverability.
Frequently asked questions
- What is an email blacklist (DNSBL)?
- A DNSBL (DNS-based blocklist) is a published list of domains and IP addresses known for sending spam. Mail servers check incoming mail against these lists — if your domain or sending IP is listed, your legitimate email can be blocked or sent straight to spam. Spamhaus and SpamRats are two of the most widely used.
- Why is my domain or IP blacklisted?
- Common causes: a compromised mailbox or server sending spam, a misconfigured mail server acting as an open relay, sending to too many invalid addresses, a shared hosting IP tainted by another customer, or your domain being spoofed in a spam campaign. Fixing the root cause first is essential — delisting without fixing the cause usually leads to a re-listing.
- How do I get removed from a blacklist?
- First fix the underlying problem (secure the account, correct the mail configuration, stop the spam source). Then use the list's removal page — this tool links directly to the Spamhaus and SpamRats lookup/delisting pages for any active listing. Some lists auto-delist once the bad activity stops; others require a manual request.
- How often should I check?
- Blacklist status can change any day, and you usually find out only when email stops getting through. A one-off check is a snapshot. Agencies and MSPs use DomainHealthPro to re-check every client domain automatically and get alerted the moment one is listed.
- Which lists does this check?
- This free tool checks SpamRats for every sending IP, and Spamhaus DBL (domain) and ZEN (IP) where enabled. Our paid monitoring runs the full Spamhaus set continuously across all your domains.