Blacklist Checker
Check if your IP or domain is listed on any major email blacklists (DNSBL) across 24+ providers.
Email Blacklists & Sender Reputation
Getting listed on a major email blacklist (RBL) is the fastest way to destroy your domain's sender reputation and route all your cold emails directly to the spam folder.
What is an Email Blacklist?
A Real-time Blackhole List (RBL) or Domain Name System Blacklist (DNSBL) is a database of IP addresses and domains suspected of sending spam. Receiving mail servers query these databases before accepting an email. If your domain or sending IP is listed, the receiver will either bounce the email completely or route it straight to the spam folder.
How do domains get blacklisted?
There are several ways to end up on a blacklist: sending cold emails to scraped lists with high bounce rates, hitting pristine spam traps (hidden email addresses used only to catch spammers), receiving a high volume of user spam complaints, or sending from an IP address that has already been poisoned by a "noisy" neighbor on shared hosting.
Spamhaus vs. Minor Blacklists
Not all blacklists carry the same weight. Being listed on Spamhaus (SBL/XBL) or SpamCop is an absolute emergency that will instantly nuke your deliverability across all major providers like Google and Microsoft. Conversely, minor blacklists (like UCEPROTECT Level 3) often list entire ASN subnets and are widely ignored by major inbox providers.
How to get de-listed?
If you find your domain listed, don't panic. First, identify the exact blacklist using our tool. Then, visit their specific website to read their de-listing policy. Usually, you must stop all outbound campaigns, clean your list of hard bounces, wait 24-48 hours, and submit a formal removal request detailing how you fixed the issue.