IP blacklists (also called DNSBLs or RBLs) are databases of IP addresses known to send spam, host malware, or engage in other malicious activities. Email servers and security systems use these lists to filter out bad traffic.
Why Check Blacklists?
- Email Deliverability: If your IP is blacklisted, your emails may be rejected or sent to spam folders.
- Security Auditing: Check if IPs in your network have been compromised or misused.
- Reputation Management: Monitor your server's reputation to maintain trust.
Blacklists We Check
- Spamhaus ZEN: Comprehensive list covering spam sources, exploits, and policy blocks.
- SpamCop: Real-time spam blocking list based on user reports.
- SORBS: Spam and Open Relay Blocking System.
- Barracuda: Barracuda Reputation Block List.
- UCEPROTECT: Multi-level blacklist system.