What is a Blacklist Checker?

A blacklist checker (also called a blocklist checker or DNSBL checker) is a tool that scans major email blacklist databases to see if your IP address or domain has been flagged as a source of spam. Email blacklists are used by mail servers worldwide to filter out unwanted messages and protect users from spam, phishing, and malware.

Why Check Your IP for Blacklisting?

Email Deliverability

If your IP is blacklisted, your emails may never reach your recipients' inboxes. They'll bounce or go straight to spam.

Sender Reputation

Your IP's reputation directly affects your email marketing success. Regular monitoring helps you maintain a clean sending record.

Major Email Blacklists We Check

Spamhaus SBL - The Spamhaus Block List, tracking verified spam sources
Spamhaus XBL - Exploits Block List for hijacked PCs and compromised servers
Spamhaus PBL - Policy Block List for dynamic IP ranges
Spamhaus CSS - CSS blocklist for known spam operations

How to Get Delisted from Email Blacklists

If your IP appears on a blacklist, don't panic. Here's what you can do:

Identify the problem - Check your mail server logs for unusual activity or compromised accounts
Fix the issue - Remove any malware, secure compromised accounts, and stop any spam sources
Request removal - Most blacklists have a delisting process. Visit their website and follow their removal procedure
Prevent future issues - Implement SPF, DKIM, and DMARC. Use double opt-in for email lists

Email Verification + Blacklist Monitoring

Blacklist checking is just one part of maintaining good email deliverability. For complete protection, you need to verify your email lists to remove invalid addresses, spam traps, and risky contacts. High bounce rates and spam complaints can quickly land your IP on a blacklist.

Need to verify email addresses?

Unlimited Verifier helps you clean your email lists before sending. Verify millions of emails for just $29 and protect your sender reputation.

Verify Your Email List

Free Blacklist Checker