Email Blacklist Checker

Check if your domain or IP is listed on major spam blacklists (Spamhaus, Barracuda, SORBS, and 50+ others).

Computational Status

AI Diagnostic Specialist

Automatically analyze tool output and explain results in plain English

Configure Tool Params

IP Address or Domain

Checks against 20+ major spam blacklists including Spamhaus, Barracuda, SORBS, SpamCop

Used 1,245 times todaySecure In-Browser Execution

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Educational Guide: Understanding Email Blacklist Checker

Step-by-Step Operation Guide

Paste/Enter Email Details

Paste raw email headers, specify domains, or configure SPF/DKIM/DMARC attributes for Email Blacklist Checker.

Analyze Deliverability

Trigger blacklist scans, query MX propagation maps, or compile configuration records.

Review Auth Results

Inspect SPF/DKIM signatures alignment, verify server status, and implement AI-suggested optimizations.

How to Interpret Diagnostic Results

Email deliverability diagnostics for Email Blacklist Checker measure server reputation and configuration safety. Standard alignments confirm authentication status.

Verify SPF, DKIM, and DMARC alignment status. Ensure host domains are not blacklisted in global spam databases to preserve sender reputation.

Troubleshooting & Industry Standards

For DNS records, verify propagation times (up to 48 hours). Resolve deliverability failures by auditing domain DNS zones and registrar settings.

Reference Standards & Protocols

RFC 7208 (SPF)RFC 6376 (DKIM)RFC 7489 (DMARC)RFC 5321 (SMTP)

Frequently Asked Questions

Learn more about how this tool works and standard configurations

An email blacklist (or DNSBL/RBL) is a real-time database that lists IP addresses or domains known to send spam, malware, or other malicious emails.

Enter your domain or outbound mail server IP address into the search input. The tool queries major spam blacklist databases to check if your server is listed.

If blacklisted, you must visit the specific blacklist provider's website (e.g., Spamhaus) and submit a de-listing request after resolving the root cause of the spam.