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How E-mail Works

E-mail is essentially a text transfer between your machine and the recipient’s machine, but it is a lot more complex than that. I’m not going to get into deep analysis of how Internet Mail Access Protocol (IMAP), Simple Mail Transfer Protocol (SMTP), or Post Office Protocol 3 (POP3) work, but you do need to understand a few key points about how a message moves through the system if we’re going to talk about security (see Figure 6-1).

Figure 6-1. Outlook e-mail client



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