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Use whitelist services. The whitelist approach has not been adopted widely since it is
difficult to set up, but it probably offers the best opportunity for the future. A
whitelist
gives a list of bona fide email addresses that are likely to want to contact people within an
organisation. It will include all employees, partners, customers and suppliers who have
obtained opt-in from employees to receive email. Email from anyone not on the list will
be blocked. However, maintaining such a list will require new software and new proce-
dures for keeping it up to date.
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