🚫 Blacklist Lookup
Check if a domain or IP is listed on major anti-spam blacklists.
📘 Understanding Blacklists
Email blacklists (Spamhaus, Barracuda) and DNSBLs affect deliverability. IPs or domains flagged for spam can ruin email campaigns. Use this tool to simulate a check. For real-time results, use MXToolbox Blacklist Check.