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An Example: Simple Mail Transfer  Protocol (SMTP)

Scenario

Email client: Outlook, TheBat, NetscapeMail …

Email server: in Unix, Windows …

Messages from a client to a mail server

HELO

MAIL FROM: <email address>

RCPT TO: <email address>

DATA <This is the text (mail body) end with a line with a single .>

QUIT

Messages from a mail server to a client

status code

1xx - Informative message

2xx - Command ok

3xx - Command ok so far, send the rest of it.

4xx - Command was correct, but couldn't be performed for some reason.

5xx - Command unimplemented, or incorrect, or a serious program error occurred.

mail body

user mailbox

outgoing

message queue

mail

server

user

agent

user

agent

user

agent

mail

server

user

agent

user

agent

mail

server

user

agent

SMTP

SMTP

SMTP

POP3,

IMAP SMTP

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