Technology / Email / Blacklist: A list developed by anyone receiving email, or processing email on its way to the recipient, or interested third-parties, that includes domains or IP addresses of any emailers suspected of sending spam. Many companies use blacklists to reject inbound email, either at the server level or before it reaches the recipient's in-box. Also Blocklist and Blackhole list.
Technology / Email / Blacklist - Private: A list of IP addresses believed to send spam, compiled by an ISP based on user complaints, mail sent to spam trap addresses, and 'unknown user' rates. Each receiving ISP uses its own private blacklist MORE
Technology / Email / Blacklist - Public: A list of IP addresses believed to send spam. Public blacklists are created and maintained by third parties; sometimes used by ISPs as another filtering mechanism to block email delivery. MORE