SMTP指令

HELO
MAIL FROM:alex@sample.com.tw    (寄件者)
RCPT TO:john@gmail.com                (收件者)
RCPT TO:mike@hotmail.com            (收件者)
DATA                                                  (郵件內容)
輸入內容
.                                                            (結束)

參考資料 http://www.samlogic.net/articles/smtp-commands-reference.htm