Glossary
Email blacklist (blocklist)
DefinitionAn email blacklist, or blocklist, is a database of IP addresses or domains observed sending spam, which mail servers query through DNS to decide whether to accept or filter incoming email.
IP blocklists list sending servers; domain blocklists list domains found in spam, including in links. Well-known lists include Spamhaus, SpamCop, Barracuda, SURBL and URIBL.
Listings usually follow spam-trap hits or complaints. Fix the cause, then request removal through the list's own site.
Related
Other terms
Email warm-up · Sender reputation · Inbox placement · SPF · DKIM · DMARC · BIMI · Spam rate · Placement test
Find out where your email lands today.
Run a free domain health check in seconds. No sign-up needed to see the result.