Free Email Checker Blacklist Check
Blacklist / DNSBL Checker
Free blacklist checker – see if a domain, IP or email is listed on Spamhaus, SpamCop, SORBS, Barracuda and other major DNSBLs affecting email deliverability.
What is a DNSBL, and why should it be checked?
A DNSBL (DNS-based Blackhole List), often called a spam blacklist, is a shared list of IP addresses and domains that mailbox providers have flagged for sending spam, malware, or abusive traffic. If a mail server's IP or a sending domain ends up on one of these lists, delivery rates can drop sharply – messages get silently filtered to spam or rejected outright, often with no warning to the sender.
What this tool checks
Enter a domain, an IPv4 address, or an email address to check it against major public blacklists, including Spamhaus ZEN, Spamhaus DBL, Barracuda, SpamCop, SORBS, PSBL, CBL and SURBL. When a domain is entered, its resolved IP addresses are also checked against the IP-based lists, since a domain and its mail server can each be listed independently.
What to do about a listing
- Confirm the cause – most lists publish a reason, such as reported spam volume or an open relay.
- Fix the underlying issue first (secure an open relay, stop a compromised account from sending, clean a purchased list) before requesting removal.
- Use each list's own delisting process – most are free and take anywhere from a few hours to a few days to process.
Since a shared host IP can be listed because of another tenant's bad behavior, it is worth checking periodically even without an obvious deliverability problem.
Frequently Asked Questions
Why would my domain be blacklisted if I never send spam?
Shared hosting IPs can be listed because of another tenant's bad behavior, and a compromised account or a purchased list can trigger a listing without any intent to spam.
How long does it take to get removed from a blacklist?
It varies by list – most delisting processes are free and take anywhere from a few hours to a few days once the underlying issue is fixed.
Should I check my domain even if I have no delivery problems?
Yes – periodic checks catch a listing before it causes a visible drop in delivery, especially on shared hosting where you don't control every sender on the same IP.