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blacklist(1) A list of e-mail addresses or domains of known spammers. See spam, spam filter, Blacklist of Internet Advertisers, greylisting and blackholing. Contrast with whitelist.
(2) A list of Web sites that are considered off limits or dangerous. A Web site can be placed on a blacklist because it is a fraudulent operation or because it exploits browser vulnerabilities to send spyware and other unwanted software to the user. Contrast with whitelist.
(3) A list of applications that a user is forbidden to run in an organization. Maintained by the system or network administrator, software in the user's computer prevents them from installing or running any program in the blacklist. Contrast with whitelist.