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White list
A whitelist is a list of accepted items or persons in a set. It
is the opposite of a
blacklist.
If an organization keeps a white list of
software, only titles on the list will be accepted for use. For example, a
school might whitelist MATLAB and Netscape Navigator, thus allowing only those programs to be used on its
computers. The benefits of whitelisting in this instance are that the school
administration can ensure itself that students will not be able to download
and/or use programs that have not been deemed appropriate for use.
If a spam
filter keeps a whitelist, mail from the listed addresses, domains, and/or IPs
will always be allowed. Whitelists are used to reduce the incidence of
false positives, often based on the assumption that most legitimate mail
will be from a relatively small and fixed set of senders.
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