IDC has put together a two-part series on spam management. In part two, we look at methods of measuring the economic impact of spam within your organization. The seven primary methods of managing spam are the following: White Lists and Black Lists. White lists reduce false positives and prevent company mail from being classified as spam, while black lists are useful for addressing mail abuse. Each of these approaches has benefits and drawbacks; as a result, many systems and corporate strategies combine multiple methods. Each spam message that reaches an end user’s desk causes some lost productivity.”]
Source: https://www.csoonline.com/article/2116547/strategies-to-manage-the-spam-menace–part-1.html