White list
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A white list is a list of accepted items or persons in a set.
If an organization keeps a white list of software, only titles on the list will be accepted for use (A school might white list MATLAB and Netscape Navigator). This may be beneficial in that whitelisted software will be ensured to work perfectly, but can cause problems as other software which is known to work may be entirely unsupported by that organization.
If a spam filter keeps a white list, mail from the listed addresses will always be allowed.
It is the opposite of a blacklist.