DNSBL (DNS-based blacklist) lists IPs associated with spam or abuse. Mail servers query these lists via DNS to decide whether to accept mail.

Why is my IP blacklisted?

Common causes include spam complaints, malware sending mail, open relays, compromised WordPress sites, or neighbor abuse on shared hosting.

How do I remove a blacklist listing?

Fix the root cause (close relays, patch malware), then follow each blacklist’s official delisting process on their website.

Yes. Another customer’s spam can list the shared egress IP — you may need a dedicated IP or new host.

Check after mail delivery issues and monthly for production SMTP. Automate monitoring if you send bulk or transactional mail.

Security Tools

Check whether an IP address is listed on major spam and abuse blacklists used by email providers and security systems.