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TCP/IP Guide by Charles M. Kozierok

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Chapter 77. TCP/IP ELECTRONIC MAIL DELIVERY PROTOCOL: THE SIMPLE MAIL TRANSFER PROTOCOL (SMTP)

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I emphasized in my overall description of TCP/IP email that communication using email requires the interaction of various protocols and elements. One mistake that some people make is to equate the method used for delivering email with the entire system. This is, however, an understandable mistake—just as the postal service is only a part of the whole system of mailing a letter, it is nonetheless a very big part. Likewise, the delivery of email from sender to recipient is arguably the most important part of email as a whole. In modern TCP/IP, this task ...

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