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The entire concept of electronic mail (email) is based on an analogy: sending electronic messages is like sending paper messages. The analogy works well, because email was indeed intended to be like regular mail, only with the advantages of the technological era: speed and flexibility.

One of the many similarities between email and regular mail is the need for addressing. For a message to be delivered, it is necessary for the sender to specify the recipient and provide a reasonable amount of information to indicate how and where the recipient can be reached. In TCP/IP email, a standard ...

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