Free tool
Email Blacklist Checker
Enter a domain and we check every one of its mail server IPs, or check a single IPv4 address, against the major DNS blocklists, with a direct link to request removal from any list.
What the blacklist checker does
An email blacklist checker queries DNS-based blocklists (DNSBLs) to see whether a sending IP or domain is listed for spam. A listing makes receivers reject or junk your mail. This tool checks a domain's mail server IPs, or any public IPv4 address, against the major IP blocklists from RocketVerifier servers, shows every listing with the IPs involved and links to each operator's removal page.
How it works
How the Blacklist Checker works
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Enter a domain or IP
Use your sending domain and we find its mail server IPs, or paste one public IPv4.
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Blocklists queried
Our servers query the major IP blocklists directly, because they refuse public DNS resolvers.
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Listings and removal links
Every listing is shown with the listed IPs and a link to request removal.
Reading your result
What the result means
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Not listed
No blocklist that answered lists the IPs. Keep it that way by sending only to verified addresses.
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Could not check
A list refused the query or did not answer for an IP. That is not a clean result, so check again later.
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Listed
At least one list flags you. Receivers using that list reject or junk your mail until the listing is removed.
FAQ
Blacklist checker FAQ
Why did my domain or IP end up on a blocklist?
Usually because mail from it hit spam traps, drew complaints or came from a compromised account or form. Old or purchased lists are the most common source of trap hits. Find and stop the cause before you request removal.
How do I get removed from a blocklist?
Fix the cause, then use the operator's removal page, linked next to each listing. Many lists expire listings automatically once the problem stops. Requesting removal while the problem continues usually leads to a longer relisting.
What is the difference between an IP and a domain blocklist?
IP blocklists list the servers that sent the mail. Domain blocklists list domains that appear in message content or as senders. A shared sending IP can be listed because of another sender, while a domain listing is about you.
Can I check blocklists from my browser with public DNS?
The major blocklists refuse queries that come through public resolvers such as 1.1.1.1 or 8.8.8.8. That is why this tool runs its checks on RocketVerifier servers and returns the result.
How do I stay off blocklists?
Send only to addresses that opted in, verify every list before you send to remove invalid and trap-like addresses, honour unsubscribes, and monitor your domains so you hear about a listing the day it happens.
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Clean a list
Stay off blocklists for good
Verify every list before you send, and monitor your domains and blocklists with alerts from one account.
100 free credits · No card required · Credits never expire