Blocklist Check (Major RBLs & Delisting Steps)
Check if your domain or IP is listed on major RBLs and get step-by-step delisting guidance.
What Is a Blocklist?
Real-time Blackhole Lists (RBLs) are databases of IP addresses and domains identified as sources of spam or malicious activity.
Spam Prevention
Block known sources of unwanted email
Real-Time Updates
Continuously updated threat intelligence
Collaborative Defense
Shared threat data across email providers
Impact on Delivery
Listed IPs/domains face email rejection
Major RBL Status Check
Clean Status
No blacklist entries found for example.com
RBL Check Results
Enter a domain or IP address above to check blacklist status
Common Blacklisting Causes
Understanding why domains and IPs get blacklisted.
🔴 High-Risk Behaviors
Spam Complaints
High recipient complaint rates (>0.1%)
Compromised Accounts
Hijacked email accounts sending spam
Poor List Hygiene
Sending to invalid or old email addresses
Malware/Botnet
Infected systems sending automated spam
🟡 Warning Signs
High Bounce Rates
Excessive hard bounces (>5%)
Sudden Volume Spikes
Dramatic increases in sending volume
Missing Authentication
No SPF, DKIM, or DMARC records
Shared IP Issues
Other users on shared infrastructure
Delisting Playbook
Identify the Root Cause
Investigation Steps
- • Review recent email campaigns
- • Check bounce and complaint rates
- • Scan for malware/compromised accounts
- • Verify email authentication
Common Tools
- • Email service provider reports
- • Server log analysis
- • Security scanning tools
- • Feedback loop data
Fix the Underlying Issues
Security Measures
Remove malware, secure compromised accounts, update passwords, enable 2FA
Email Practices
Implement double opt-in, clean email lists, reduce sending volume temporarily
Authentication
Configure SPF, DKIM, and DMARC records properly
Submit Delisting Requests
Major RBL Removal Links
Removal Best Practices
- • Provide detailed explanation
- • Show corrective actions taken
- • Include supporting evidence
- • Be patient and professional
Monitor and Prevent Re-listing
Ongoing Monitoring
- • Set up regular blacklist monitoring
- • Monitor bounce and complaint rates
- • Maintain good sending practices
- • Keep security measures updated
Run a Full Email Security Audit
Check blacklists, authentication, and more in one comprehensive scan
Frequently Asked Questions
How long does delisting take?
Delisting times vary by RBL. Some are automatic (24-48 hours), others require manual review (1-7 days). Follow each RBL's specific process and be patient. Some may require multiple attempts.
How to prevent re-listing?
Maintain good sending practices: authenticate emails with SPF/DKIM/DMARC, monitor bounce rates, use double opt-in, avoid spam triggers, implement feedback loops, and keep security updated.
What if delisting is denied?
Review the denial reason, address any remaining issues, wait the recommended time period, and resubmit with additional evidence of corrective actions. Consider switching to a dedicated IP if on shared infrastructure.