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Understanding TCP/IP by Libor Dostálek, Alena Kabelová

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Chapter 15. Email

Electronic mail (email) is one of the oldest and also one of the most widely used Internet services. Mail communication is performed by many application protocols (SMTP, POP3, IMAP4, etc.), and this chapter describes these protocols.

Support from Operating Systems

At present, email is implemented probably in all existing operating systems. Logically, operating systems of end-user stations implement clients of particular protocols while server operating systems implement mail servers. As was described in the case of TCP/IP protocol, a mail server is far beyond the client-server architecture. It is better to use the more appropriate term Mail Transfer Agent (MTA) instead of mail server.

Security

Two types of security are used for email: ...

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