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Page 69: Example SMTP conversation
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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