If the white list is set, users (or IP addresses, IP packets, emails, etc. ) will be given priority in the white list and will not be rejected as spam, so the security and speed are greatly improved.

White list is to set users who can pass, and users outside the white list cannot pass. Blacklist refers to users who can't pass the setting, and users outside the blacklist can pass.

So generally speaking, there are more users restricted by white lists than blacklists.

Extended data blacklist source

The word blacklist comes from world-renowned universities such as Oxford and Cambridge in Britain. In the early Middle Ages, these schools stipulated that the names and behaviors of students who committed bad behaviors should be recorded in black books. Whoever is named in the black book, even if it is not notorious for life, will make people lose their reputation for a long time. Students are very afraid of this regulation of the school, and they often take care to prevent deviant behavior.

reference data

White list Baidu encyclopedia

Blacklist Baidu Encyclopedia