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SMTP (History (SMTP grew out of these standards developed during the 1970s…
SMTP
History
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The SMTP standard was developed around the same time as Usenet, a one-to-many communication network with some similarities
SMTP works best when both the sending and receiving machines are connected to the network all the time
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It did not deal well with binary files, or characters in many non-English languages
Model
Once the final hop accepts the incoming message, it hands it to a mail delivery agent (MDA) for local delivery
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Once delivered to the local mail server, the mail is stored for batch retrieval by authenticated mail clients
SMTP defines message transport, not the message content
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Secuencia
RCPT
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This command can be issued multiple times, one for each recipient
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DATA
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Server replies twice
Once to the DATA command itself, to acknowledge that it is ready to receive the text
The second time after the end-of-data sequence, to either accept or reject the entire message
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