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(tǒng)功能。它的命令是由結(jié)束的字符串。而在帶有參數(shù)的情況下，命令本身由和參數(shù)分開(kāi)，如果未帶參數(shù)可以直接和連接。郵箱的語(yǔ)法格式必須和接收站點(diǎn)的格式一致。下面討論SMTP命令和應(yīng)答。發(fā)送郵件操作涉及到不同的數(shù)據(jù)對(duì)象，它們由不同的參數(shù)相互連接?；貜?fù)路徑就是MAIL命令的參數(shù)，而轉(zhuǎn)發(fā)路徑則是RCPT命令的參數(shù)，郵件日期是DATA命令的參數(shù)。這些參數(shù)或者數(shù)據(jù)對(duì)象必須跟在命令后。這種模式也就要求有不同的緩沖區(qū)來(lái)存儲(chǔ)這些對(duì)象，也就是說(shuō)，有一個(gè)回復(fù)路徑緩沖區(qū)，一個(gè)轉(zhuǎn)發(fā)路徑緩沖區(qū)，一個(gè)郵件內(nèi)容緩沖區(qū)。特定的命令產(chǎn)生自己的緩沖區(qū)，或使一個(gè)或多個(gè)緩沖的內(nèi)容被清除。

HELLO (HELO)

此命令用于向接收SMTP確認(rèn)發(fā)送SMTP。參數(shù)域包括發(fā)送SMTP的主機(jī)名。接收SMTP通過(guò)連接確認(rèn)命令來(lái)向發(fā)送SMTP確認(rèn)接收SMTP。引命令和OK響應(yīng)確認(rèn)發(fā)送和接收SMTP進(jìn)入了初始狀態(tài)，也就是說(shuō)，沒(méi)有操作正在執(zhí)行，所有狀態(tài)表和緩沖區(qū)已經(jīng)被子清除。

MAIL (MAIL)

此命令用于開(kāi)始將郵件發(fā)送到一個(gè)多個(gè)郵箱中。參數(shù)域包括回復(fù)路徑。返回路徑中包括了可選的主機(jī)和發(fā)送者郵箱列表。當(dāng)有主機(jī)列表時(shí)，它是一個(gè)回復(fù)路徑源，它說(shuō)明此郵箱是由在表中的主機(jī)一一傳遞發(fā)送(第一個(gè)主機(jī)是最后一個(gè)接收到此郵件的主機(jī))過(guò)來(lái)的。此表也有作向發(fā)送者返回非傳遞信號(hào)的源路徑。因?yàn)槊總€(gè)傳遞主機(jī)地址都被加在此表起始處，它就必須使用發(fā)送IPCE而不是接收IPCE.