Free email blacklist checker
Check whether an IP address or domain is listed on common email blocklists.
Enter the IP address of the server that sends your email (you’ll find it in the first Received header of a message – try our header analyzer), or a domain to check its mail servers and domain reputation.
About these results
Blocklists (also called blacklists, DNSBLs or RBLs) are published in DNS. We query them through Google Public DNS from your browser. Some lists – including Spamhaus – refuse queries from public DNS services; when that happens we show the list as unavailable rather than guessing, and link to the list’s own lookup page.
Being listed on one minor list rarely affects delivery to large providers. A listing on Spamhaus, SpamCop or Barracuda is more serious. If your IP is listed, fix the cause first – such as a compromised account or infected device – then request removal from the list.
A free tool provided by Auth-Email
Auth-Email makes your Gmail, Outlook, or other OAuth 2.0 email account available to any IMAP, POP3, or SMTP email client — no app passwords or special configuration needed.
Frequently asked questions
What is an email blacklist?
Email blacklists (also called blocklists or DNSBLs) are lists of IP addresses and domains associated with spam. Receiving mail servers check them, and may reject or filter email from listed senders.
Why does the checker say a list could not be checked?
Some blocklists, including Spamhaus, refuse queries made through large public DNS services. When that happens we show the list as unavailable rather than guessing. You can check those lists directly on their own websites.
How do I get removed from a blacklist?
First fix the cause (for example, a compromised account or misconfigured server), then follow the delisting process on the blocklist’s website. Many lists remove entries automatically after a period with no further spam.