Guide
What blacklist (DNSBL) status means
What it means to be 'listed', why it happens, and how to recover.
Check blacklist statusWhat blacklists actually do
DNSBLs (DNS-based blocklists) are queried by mail servers and security tools to filter abusive senders. A listing means at least one operator observed spam or abuse from that IP or domain.
Why you might be listed
Common causes: a compromised mailbox, a misconfigured form on your website, sharing IP space with a bad neighbor, or sudden volume changes interpreted as spam.
How to get delisted
Fix the source first. Then visit the listing operator's removal page — many require proof that the abuse has stopped. Some lists expire automatically.
Stay ahead with monitoring
Pro monitoring checks the major lists continuously and alerts you on the first listing — long before it impacts deliverability.