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SMTP mail order definition of the transmission or by user-defined functions. It is an order from end of the string. With the parameters of the case, ordered by itself and separate parameters, If the parameter can not bring direct and link. One format must receive site and the format. Discussed below SMTP orders and responses. Send mail to the operation involves different data objects, which by different parameters interconnected. MAIL return path is the order parameter, which is the path forward RCPT order parameters, DATA date of the mail order parameters. These parameters or data object must follow in order. This model also requires a different buffer to store these objects, in other words, there is a path back buffer a forward path buffer zone, a buffer zone Mail. Specific order to generate their own buffer zone, or one or more of the buffer contents were removed. HELLO (HELO) order for this to the receiving SMTP SMTP confirm this. Send domain parameters including SMTP host name. By the receiving SMTP authentication order to connect to this SMTP confirmed receiving SMTP. OK primer in response to orders and send and receive confirmation SMTP entered the initial state, that is to say, no operation is being executed. All state table and buffer zones have been cleared of quilts. MAIL (MAIL) This Order will be used for start-mail sent to more than one mailbox. Parameters include restoring domain path. Return to the path including the optional mainframe and mail senders list. When the host list, it is a source of return path, It shows that this mail is from the host table on January 1 this transfer (a mainframe is the last one is now receiving mail server ) overnight. This table can also be made to send non-return of the source of signal transmission path. Every transfer mainframe addresses were added to the beginning of this table, it must use this instead of receiving IPCE.

SMTP命令定義了郵件傳輸或由用戶定義的系統功能。它的命令是由結束的字符串。而在帶有參數的情況下，命令本身由和參數分開，如果未帶參數可以直接和連接。郵箱的語法格式必須和接收站點的格式一致。下面討論SMTP命令和應答。發送郵件操作涉及到不同的數據對象，它們由不同的參數相互連接。回復路徑就是MAIL命令的參數，而轉發路徑則是RCPT命令的參數，郵件日期是DATA命令的參數。這些參數或者數據對象必須跟在命令后。這種模式也就要求有不同的緩沖區來存儲這些對象，也就是說，有一個回復路徑緩沖區，一個轉發路徑緩沖區，一個郵件內容緩沖區。特定的命令產生自己的緩沖區，或使一個或多個緩沖的內容被清除。

HELLO (HELO)

此命令用于向接收SMTP確認發送SMTP。參數域包括發送SMTP的主機名。接收SMTP通過連接確認命令來向發送SMTP確認接收SMTP。引命令和OK響應確認發送和接收SMTP進入了初始狀態，也就是說，沒有操作正在執行，所有狀態表和緩沖區已經被子清除。

MAIL (MAIL)

此命令用于開始將郵件發送到一個多個郵箱中。參數域包括回復路徑。返回路徑中包括了可選的主機和發送者郵箱列表。當有主機列表時，它是一個回復路徑源，它說明此郵箱是由在表中的主機一一傳遞發送(第一個主機是最后一個接收到此郵件的主機)過來的。此表也有作向發送者返回非傳遞信號的源路徑。因為每個傳遞主機地址都被加在此表起始處，它就必須使用發送IPCE而不是接收IPCE.