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Page 69: Example SMTP conversation

Page 69

Same conversation between sender's MUA and sender's ISP, and between
sender's ISP and recipient's ISP. Recipient uses POP or IMAP to get
email, not SMTP.

Note that I can claim to be anyone in the "mail from" line.
This message only has one recipient, but I could have sent it to
several people by adding more "rcpt to" commands.

Three important phases: before the message, where we have committed
minimal resources to it (handling the connection and doing any
security checks that are necessary); during the message, where we have
to write it to disk; and after the message where we have become
responsible for its onward delivery.

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