The TCP/IP Guide - SMTP Security Issues: "Despite this obvious problem, efforts to implement a general security mechanism in SMTP have been resisted for two main reasons. First, there is no foolproof way to retrofit a new security mechanism onto something as widely used as SMTP without creating incompatibilities between newer and older systems. Second, many administrators were reluctant to completely do away with the general notion of cooperation between sites that has helped make the Internet so successful, simply due to a few “bad apples”."
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