Free Email Blacklist Checker — Scan 10 DNSBL Databases
Check if your domain or mail server IP is listed on major DNS blacklists. Scan 10 DNSBL databases instantly including Spamhaus, Barracuda, and SpamCop. Free IP reputation check.
What are DNS Blacklists (DNSBL)?
DNS-based Blackhole Lists (DNSBLs) are real-time databases that track IP addresses and domains known to send spam or malicious email. Mail servers query these lists during the SMTP handshake to decide whether to accept, flag, or reject incoming messages. If your sending IP or domain appears on one or more blacklists, your emails may be silently dropped or routed to the spam folder — even if your content is perfectly legitimate.
Enter your domain below to scan 10 major DNSBL databases and see your blacklist status instantly.
Understanding Email Blacklists
Email blacklists are maintained by independent organizations that monitor email traffic for spam patterns, open relays, compromised servers, and other abuse indicators. When a mail server receives an incoming connection, it can query one or more DNSBL services in real time. If the sender’s IP address is found on a list, the receiving server may reject the message outright, add spam headers, or increase the spam score.
Major blacklists include Spamhaus (SBL, XBL, PBL), Barracuda BRBL, SpamCop, SORBS, and several others. Each list has its own criteria for adding and removing entries. Some focus on known spam sources, while others flag dynamic IP ranges or servers with poor configuration.
Being listed on even one blacklist can severely impact your email deliverability. Messages may bounce, land in spam folders, or never reach the recipient at all — affecting transactional emails, marketing campaigns, and day-to-day business communication.
How to Get Delisted from a Blacklist
1. Identify the Root Cause
Before requesting removal, find out why you were listed. Common causes include sending spam (intentionally or via a compromised account), poor list hygiene with high bounce rates, missing authentication records (SPF, DKIM, DMARC), or operating on a shared IP with another offender.
2. Fix the Underlying Issue
Clean your mailing list, remove invalid addresses, secure compromised accounts, and ensure your DNS authentication records are properly configured. If you are on a shared IP, contact your email service provider to request a clean IP or resolve the issue with the other sender.
3. Submit a Delisting Request
Most blacklists provide a self-service removal form. Visit the blacklist’s website, search for your IP, and follow their delisting procedure. Some lists (like Spamhaus) remove entries automatically after the issue is resolved and a time period has passed. Others require a manual request.
4. Monitor Continuously
After delisting, monitor your IPs and domains regularly. Set up automated checks to catch new listings early before they damage your sender reputation. Consistent monitoring is the best way to maintain strong deliverability.
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