Sample SMTP Interaction(不用任何邮件客户端发邮件)

    S: 220 hamburger.edu

    C: HELO crepes.fr

    S: 250  Hello crepes.fr,pleased to meet you

    C: MAIL FROM: <[e-mail]>

    S: 250 [e-mail]... Sender ok

    C: RCPT TO: <[e-mail]>

    S: 250 [e-mail] ... Recipient ok

    C: DATA

    S: 354 Enter mail, end with "." on a line by itself

    C: Do you like ketchup?

    C: How about pickles?

    C: .

    S: 250 Message accepted for delivery

    C: QUIT

    S: 221 hamburger.edu closing connection