Domain & IP Blacklist Checker

Check if your domain or IP address is listed on 22+ major DNS-based blacklists used by Gmail, Microsoft 365, and corporate mail filters. Includes delist links for every blacklist.

Blacklists We Check

• Spamhaus ZEN & DBL — Most widely used blacklist, protecting 3B+ mailboxes worldwide
• Barracuda BRBL — Used by 200K+ organizations running Barracuda filters
• SpamCop — Real-time blocklist based on user spam reports
• SURBL & URIBL — Domain-based blocklists checking URLs in email bodies
• Invaluement — Catches sophisticated snowshoe spam that evades volume-based lists
• SORBS, CBL, PSBL — Supplementary lists covering open relays, botnets, and honeypots
• SpamRats, Mailspike, BlockList.de — Additional reputation and abuse detection lists

What To Do If You're Blacklisted

1. Stop sending — Pause all email from the affected domain/IP immediately
2. Identify the cause — Check for compromised accounts, open relays, or high complaint rates
3. Fix the issue — Remove bad addresses, secure accounts, improve targeting
4. Request delisting — Visit the delist URL for each blacklist with an explanation
5. Monitor — Re-check weekly and set up Google Postmaster Tools for ongoing monitoring