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Bulk Domain Blacklist Checker
Check hundreds of emails or domains at once for blacklisting by Spamhaus. We use Spamhaus DQS (Data Query Service) - the same service that Microsoft 365 and major email providers use.
Bulk Blacklist Checker
What We Check
We query three major Spamhaus blacklists that email providers use to filter spam:
- • DBL (Domain Block List) - Checks if your domain is blacklisted
- • ZRD (Zero Reputation Domain) - Checks if your domain has zero reputation
- • HBL (Hash Block List) - Checks if the specific email address is blacklisted
Why Spamhaus Matters
- • Used by Microsoft 365, Gmail, and most major email providers
- • Being listed can cause your emails to go straight to spam or be rejected
- • Regular monitoring helps maintain good sender reputation
- • Early detection allows you to take corrective action quickly
Understanding the Results
- • "Not listed" - Good! Your email/domain is clean
- • "Domain is listed" - Your domain has been blacklisted
- • "Email is listed" - The specific email address is blacklisted
- • "DNS Error" - Temporary issue, try again in a moment
Important-Emails Does This Automatically
When you use Important-Emails for cold email, we automatically monitor all your domains for blacklist status, alert you to issues immediately, and help you maintain a clean sender reputation.
Learn about hidden blocklistsGet Started with Important-Emails