Definitions for "White list"
Keywords:  spam, senders, want, list, trimmail
A list of business concerns regarded as worthy of patronage by reason of compliance with certain conditions, as in regard to treatment of employees; as, the white list of the Consumers' League.
The official list of all transactions, published daily on white paper, divided into sales from 10 to 12, 12 to 2, and 2 to 3.
A list of email addresses or IP addresses from which a mail server is configured to accept incoming mail. White lists can be useful as one part of an email filtering system. Compare this with "black list."
a good tool for including always-trusted domains, but on the web, it is often a script from a relatively-untrusted domain that must be granted access to other untrusted domains, without compromising internal domains