上海时时彩开奖结杲2元 ?

企業郵局

郵件服務器是怎么工作的?

臺州新時迅網絡公司| 2013-09-17 | 瀏覽:98| 打印

這是一張郵件服務器的工作示意圖,Linode制作。

MTA:郵件傳輸代理,接受和發送郵件都需要它。
MDA:郵件傳遞代理,只在接受郵件時用到,通過它把郵件傳遞到郵箱。
IMAP/POP3:通過IMAP/POP3連接,管理用戶和郵箱。

一個允許發送和接收郵件的并帶郵件客戶端的郵件服務器都由這三個獨立的軟件組成。

英文原文:

Every mail server that lets you send and receive email with a local mail client has three separate software components - a Mail Transfer Agent (MTA), a Mail Delivery Agent (MDA), and an IMAP/POP3 server. The MTA relays mail between your Linode and the wider Internet, whether it's delivering an outside email to one of your users, or sending an email from one of your users. Accepted incoming mail gets added to the MTA's queue on the server. The MDA takes mail from the MTA's queue and saves it to individual mailboxes on your Linode. The IMAP/POP3 server manages users and their mailboxes as they check their email over IMAP/POP3 connections.

How does it work? First, an incoming message is directed to your Linode via DNS. Once it passes through the MTA and MDA, it is stored in the user's mailbox on the server. When the message is requested, the IMAP/POP3 server mediates the connection between your Linode and the user's local mail client. Outgoing mail is sent from the user's local mail client, processed by your Linode's MTA, and is then sent to its destination on the Internet.

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上海时时彩开奖结杲2元